appletviewer

5. How can I use the JDBC API to access a desktop database like Microsoft Access over the network?Most desktop databases currently require a JDBC solution that uses ODBC underneath. This is because the vendors of these database products haven’t implemented all-Java JDBC drivers. The beat come is to use a commercial JDBC driver that supports ODBC and the database you want to use. See the JDBC drivers page for a enumerate of available JDBC drivers. The JDBC-ODBC bridge from Sun’s Java Software does not provide network access to desktop databases by itself. The JDBC-ODBC bridge loads ODBC as a local DLL and typical ODBC drivers for desktop databases like Access aren’t networked. The JDBC-ODBC bridge can be used together with the RMI-JDBC bridge however to access a desktop database like find over the net. This RMI-JDBC-ODBC solution is free.6. Does the JDK include the JDBC API and the JDBC-ODBC connect?Yes the JDK 1.1 and the Java 2 SDK. Standard Edition (formerly known as the JDK 1.2) include both the JDBC API and the JDBC-ODBC Bridge. The Java 2 SDK. Standard Edition contains the JDBC 2.0 core API which is the latest version. It does not include the JDBC 2.0 Optional Package which is move of the Java 2 SDK. Enterprise Edition or which you can download separately. say that the version of the JDBC API and the JDBC-ODBC Bridge provided for displace download on the JDBC download summon are only for use with the JDK 1.0.2.7. What JDBC technology-enabled drivers are available?See our web summon on JDBC technology-enabled drivers for a current listing.8. What documentation is available for the JDBC API?See the JDBC technology home summon for links to information about JDBC technology. This summon links to information about features and benefits a list of new features a divide on getting started online tutorials a divide on driver requirements and other information in addition to the specifications and javadoc documentation.9. Are there any ODBC drivers that do not work with the JDBC-ODBC Bridge?Most ODBC 2.0 drivers should bring home the bacon with the Bridge. Since there is some variation in functionality between ODBC drivers the functionality of the bridge may be affected. The bridge works with popular PC databases such as Microsoft Access and FoxPro.10. Does the JDBC-ODBC Bridge work with Microsoft J++?No. J++ does not give the JDBC-ODBC connect since it doesn’t implement the Java Native Interface (JNI). Any all-Java JDBC driver should bring home the bacon with J++ however.11. What causes the "No suitable driver" error?"No suitable driver" is an error that usually occurs during a label to the DriverManager getConnection method. The cause can be failing to load the appropriate JDBC drivers before calling the getConnection method or it can be specifying an invalid JDBC URL—one that isn’t recognized by your JDBC driver. Your best bet is to check the documentation for your JDBC driver or contact your JDBC driver vendor if you guess that the URL you are specifying is not being recognized by your JDBC driver. In addition when you are using the JDBC-ODBC Bridge this error can occur if one or more the the shared libraries needed by the connect cannot be loaded. If you evaluate this is the create analyse your configuration to be sure that the shared libraries are accessible to the Bridge.12. Why isn’t the java sql. DriverManager class being found?This problem can be caused by running a JDBC applet in a browser that supports the JDK 1.0.2 such as Netscape Navigator 3.0. The JDK 1.0.2 does not contain the JDBC API so the DriverManager class typically isn’t open by the Java virtual machine running in the browser. Here’s a solution that doesn’t require any additional configuration of your web clients. Remember that classes in the java.* packages cannot be downloaded by most browsers for security reasons. Because of this many vendors of all-Java JDBC drivers give versions of the java sql.* classes that have been renamed to jdbc sql.* along with a version of their driver that uses these modified classes. If you merchandise jdbc sql.* in your applet code instead of java sql.* and add the jdbc sql.* classes provided by your JDBC driver vendor to your applet’s codebase then all of the JDBC classes needed by the applet can be downloaded by the browser at run time including the DriverManager class. This solution ordain allow your applet to work in any client browser that supports the JDK 1.0.2. Your applet ordain also bring home the bacon in browsers that give the JDK 1.1 although you may want to switch to the JDK 1.1 classes for performance reasons. Also keep in object that the solution outlined here is just an example and that other solutions are possible.13. Why doesn’t calling the method Class forName fill my JDBC driver?There is a bug in the JDK 1.1 x that can create the method categorise forName to fail. A workaround is to explicitly call the method DriverManager registerDriver(new YourDriverClass()). The claim problem in the JDK is a go condition in the categorise loader that prevents the static divide of code in the driver categorise from executing and registering the driver with the DriverManager.14. Why do the java sql and java math packages fail to download java.* packages? Is there a workaround?For security reasons browsers will not transfer java.* packages. In order to use the JDBC API with browsers that have not been upgraded to JDK1.1 or beyond we recommend that the java sql and java math packages be renamed jdbc sql and jdbc math. Most vendors supplying JDBC technology-enabled drivers that are written purely in the Java programming language already provide versions of these renamed packages. When JDK 1.1 support has been added to your browser you should alter your applets back to the java.* case names.15. Why is the precision of java math. BigDecimal limited to 18 digits in the JDK 1.0.2 add-on version of the JDBC API?In JDK 1.1 java math. BigInteger is implemented in C. It supports a precision of thousands of digits. The same is true for BigDecigmal. The version of BigInteger provided with the JDK 1.0.2 add-on version of the JDBC API is a simplified version written in the Java programming language and it is limited to 18 digits. Because the implementation of BigDecimal is based on BigInteger it also is limited to this precision. In the JDBC 2.0 API you can use a new version of the method ResultSet getBigDecimal that does not take a scale parameter and returns a BigDecimal with beat precision.16. Can the JDBC API be added to JDK 1.0.2?Yes. transfer the JDBC 1.22 API from the JDBC transfer page and go the installation instructions in the channel notes. If you are using any version of the JDK from 1.1 on the JDBC API is already included and you should not download the JDBC 1.22 API.17. How do I retrieve a whole row of data at once instead of calling an individual ResultSet getXXX method for each column?The ResultSet getXXX methods are the only way to acquire data from a ResultSet object which means that you have to make a method call for each column of a row. It is unlikely that this is the create of a performance problem however because it is difficult to see how a column could be fetched without at least the cost of a function call in any scenario. We accept input from developers on this issue.18. Why does the ODBC driver manager return ‘Data obtain name not found and no default driver specified Vendor: 0’This type of error occurs during an attempt to connect to a database with the bridge. First note that the error is coming from the ODBC driver manager. This indicates that the bridge-which is a normal ODBC client-has successfully called ODBC so the problem isn’t due to native libraries not being show. In this case it appears that the error is due to the fact that an ODBC DSN (data source label) needs to be configured on the client forge. Developers often drop to do this thinking that the bridge ordain magically find the DSN they configured on their remote server machine19. Are all the required JDBC drivers to establish connectivity to my database move of the JDK?No. There aren’t any JDBC technology-enabled drivers bundled with the JDK 1.1 x or Java 2 Platform releases other than the JDBC-ODBC connect. So developers be to get a driver and install it before they can connect to a database. We are considering bundling JDBC technology- enabled drivers in the future.20. Is the JDBC-ODBC Bridge multi-threaded?No. The JDBC-ODBC Bridge does not give concurrent access from different threads. The JDBC-ODBC Bridge uses synchronized methods to serialize all of the calls that it makes to ODBC. Multi-threaded Java programs may use the Bridge but they won’t get the advantages of multi-threading. In addition deadlocks can become between locks held in the database and the semaphore used by the connect. We are thinking about removing the synchronized methods in the future. They were added originally to make things simple for folks writing Java programs that use a single-threaded ODBC driver.21. Does the JDBC-ODBC Bridge support multiple concurrent change state statements per connection?No. You can open only one Statement disapprove per connection when you are using the JDBC-ODBC connect.22. Does the JDBC-ODBC connect developed by Merant and Sun support result sets that contain Japanese Characters (DBCS)?Yes but we haven’t tested this ourselves. The version of the Bridge in the Java 2 SDK. Standard Edition and Java 2 SDK. Enterprise Edition also supports a new charSet Connection property for specifying the character encoding used by the underlying DBMS.23. Why can’t I create the ResultSet methods afterLast and beforeFirst when the method next works?You are probably using a driver implemented for the JDBC 1.0 API. You need to upgrade to a JDBC 2.0 driver that implements scrollable result sets. Also be sure that your code has created scrollable result sets and that the DBMS you are using supports them.24. How can I acquire a arrange or other object type without creating a new disapprove each time?Creating and garbage collecting potentially large numbers of objects (millions) unnecessarily can really hurt performance. It may be better to give a way to retrieve data desire strings using the JDBC API without always allocating a new object. We are studying this issue to see if it is an area in which the JDBC API should be improved. Stay tuned and gratify displace us any comments you have on this question.25. There is a method getColumnCount in the JDBC API. Is there a similar method to find the number of rows in a result set?No but it is easy to sight the be of rows. If you are using a scrollable result set rs you can call the methods rs measure and then rs getRow to find out how many rows rs has. If the result is not scrollable you can either ascertain the rows by iterating through the prove set or get the number of rows by submitting a query with a ascertain column in the decide clause.26. I would like to download the JDBC-ODBC Bridge for the Java 2 SDK. Standard Edition (formerly JDK 1.2). I’m a beginner with the JDBC API and I would like to go away with the connect. How do I do it?The JDBC-ODBC Bridge is bundled with the Java 2 SDK. Standard Edition so there is no need to download it separately.27. If I use the JDBC API do I have to use ODBC underneath?No this is just one of many possible solutions. We advise using a pure Java JDBC technology-enabled driver type 3 or 4 in order to get all of the benefits of the Java programming language and the JDBC API.28. Once I have the Java 2 SDK. Standard Edition from Sun what else do I need to cerebrate to a database?You comfort be to get and install a JDBC technology-enabled driver that supports the database that you are using. There are many drivers available from a variety of sources. You can also try using the JDBC-ODBC Bridge if you have ODBC connectivity set up already. The Bridge comes with the Java 2 SDK. Standard Edition and Enterprise Edition and it doesn’t demand any extra setup itself. The connect is a normal ODBC client. Note however that you should use the JDBC-ODBC Bridge only for experimental prototyping or when you have no other driver available.16What is a JDBC Driver?A JDBC driver is the set of classes that implement the JDBC interfaces for a particular database. There are four different types of JDBC driver: A write 1 driver is a JDBC-ODBC connect driver; this type of driver enables a client to cerebrate to an ODBC database via Java calls and JDBC—neither the database nor middle tier need to be Java compliant. However. ODBC binary code must be installed on each client forge that uses this driver. A Type 2 driver converts JDBC calls into calls for a specific database. This driver is referred to as a native-API partly Java driver. As with the Type 1 driver some binary code may be required on the client machine which means this write of driver is not suitable for downloading over a communicate to a client. A Type 3 driver is a JDBC-Net pure Java driver which translates JDBC calls into a database -independent net protocol. Vendors of database middleware products can apply this write of driver into their products to provide interoperability with the greatest number of database servers. Finally a Type 4 driver or native protocol pure Java driver converts JDBC calls into the network protocol used by the database directly. A write 4 driver requires no client software so it’s ideal for deployment to browsers at runtime. Each of these driver types has its own optimal usage scenarios and will alter the way you deploy a given Java application. For example because Type 4 drivers are 100% Java use Java sockets to connect to the database and require no client-side data access label they are ideal for applets or other download situations inside a firewall. Oracle’s JDBC DriversOracle provides both Type 2 and Type 4 drivers. All Oracle JDBC drivers support the full JDBC specification but in addition they give the extended capabilities of the Oracle database. For example the JDBC specification doesn’t give LOB data but the Oracle OCI8 JDBC driver does. Oracle’s implementation of the Type 2 JDBC driver is referred to as the Oracle "OCI driver," and the version of this driver that supports an Oracle 7 database is the OCI7 driver and the OCI8 supports Oracle 8. These drivers are platform specific; for example the Windows NT and Windows 95 version of the driver (oci805jdbc dll.) is implemented as a dynamic link library (DLL) in C. As mentioned previously. Type 2 drivers may demand client code. In the case of the OCI8 driver the clients must have Oracle’s Net*8 and all other dependent files loaded. A common way to implement Oracle OCI drivers is to use Oracle Application Server with the JWeb cartridge on the middle tier and deploy the client presentation logic as an applet; the interaction with the Oracle database is conducted from the lay tier only with just the results sent to the client applet as pure HTML or Java and HTML. All Oracle drivers are compliant with the Java Development Kit JDK 1.0 and 1.1 x and support the JDBC 1.22 standard. In addition all Oracle JDBC drivers support data types such as RAW and LONG RAW. ROWID and RECURSOR which are supported in Oracle databases but not part of the JDBC standard. Oracle’s drivers also support execution of PL/SQL stored procedures and anonymous blocks (for dynamic execution) andinclude capabilities such as row pre-fetching execution batching and defining query columns toreduce the communicate round trips to Oracle database. In addition the OCI driver for Oracle8 supports oracle data types CLOB. change surface. NCLOB and BFILE. The screenshot shows an example of one of the classes in the Oracle JDBC as move of the class hierarchy from which it descends as displayed in Oracle’s JDeveloper integrated development environment. As you can see the OraclePreparedStatement class inherits from the java sql. PreparedStatement class which in move inherits from the java sql. Statement. Oracle also provides a Type 4 JDBC driver referred to as the Oracle "thin" driver. This driver includes its own implementation of a TCP/IP version of Oracle’s Net8 written entirely in Java so it is platform independent can be downloaded to a browser at runtime and does not demand any Oracle software on the client side. This driver requires a TCP/IP listener on the server side and the client connection arrange uses the TCP/IP port communicate not the TNSNAMES entry for the database name.1. Add JDBC classes to your Java application or applet class by adding the following statement to your Java obtain code:import java sql.*;To use the extended capabilities of the Oracle database you must also import the Oracle JDBC driver. The statement in Java source looks like this:import oracle. JDBC driver.*2. fill the JDBC driver by including the following statement in your class. Class forName("oracle. JDBC driver. OracleDriver");You can fill the driver from your class-initialization routine.3. acquire a connection to an Oracle database by calling the getConnection() method of the JDBC DriverManager categorise. When you call this method you need to specify the connection information for the database in the create of a URL. The create the URL ordain act depends on the driver used. For example to use the pure Java write 4 Oracle driver (the thin driver) to connect to an Oracle7 database the URL would construe:jdbc:oracle:thin@database_name:port_no:SIDTo connect to an Oracle8 database using the OCI driver the URL would be more desire:jdbc:oracle:oci8@database_nameTo specify the database for use with an OCI driver you can use either a SQL*Net name- value pair or if you’re using an Oracle label server you can use the label from the tnsname ora register. (Both of these strings would conclude with the logon information as well—specifically the user name and password—but we’ve eliminated that from this example.)The preliminary driver and database-connection issues now taken care of there are comfort several other things your Java obtain label must include in order for the compiled label to submit queries to the database and process results.4. Create a Statement object by calling the createStatement() method of the Connection object you created in the previous go. The following statement creates a Statement object stmt:Statement stmt = channelise createStatement ();5. Once the Statement disapprove exists (in code) the application can then include code to execute a SQL query by calling the executeQuery() method of the Statement object. The executeQuery() method returns the result of the query in the ResultSet object. The following statement executes a query :ResultSet rset = stmt executeQuery (SELECT ename from emp where empno = 7900);6. Finally label the next() method of a ResultObject to acquire a row and show it. Use a loop if the ask returns more then one row from the database. For example the following statements get the name of an employee from the ResultSet disapprove and display it in the java awt text control placed on the GUI rset next();enameTxtb setText = ((String)rset getString(1));16JDBC (java database conctivity)1. What is JDBC ? what are its advantages ?A. It is an API. The latest version of jdbc api is (3.0). The JDBC 3.0 API is divided into two packages:(1) java sql and (2) javax sql. Both packages are included in the J2SE and J2EE platforms advantages:The JDBC API can be used to act with multiple data sources in a distributed heterogenous environment. It can connect to any of the database from java language. It can switch over to any backend database without changing java code or by minute changes.2. How many JDBC Drivers are there ? what are they?A. There are 4 types of JDBC drivers a. JDBC-ODBC connect Driver(Type-1 driver)b. Native API Partly Java Driver(Type-2 driver)c. Net protocol pure Java Driver(Type-3 driver)d. Native protocol Pure Java Driver(Type-4 driver)3. Explain about JDBC-ODBC driver(Type-1) ? When this write of driver is used ?A. In this mechanism the flow of execution ordain beJava code(JDBC API) -------> The syntax of the subname is driver specific. The driver may choose any syntax allot for its implementationex: jdbc:odbc:dsnjdbc:oracle:oci8:@ database name jdbc:orale:thin:@ database name:port be:SID10. How do u fill a driver ?A. Using Driver Class forName(java lang. String driverclass) or registerDriver(Driver driver) .11 what are the types of resultsets in JDBC3.0 ?How you can acquire information of resultset?A. ScrollableResultSet and ResultSet. We can retrieve information of resultset by using java sql. ResultSetMetaData interface. You can get the dilate by calling the method getMetaData() on ResulSet disapprove.12 write the steps to Connect database?A. Class forName(The class name of a spasific driver);Connection c=DriverManager getConnection(url of a spasific driver,user label,password);Statement s=c createStatement();(or)PreparedStatement p=c prepareStatement();(or)CallableStatement cal=c prpareCall();Depending upon the requirement.13. Can java objects be stored in database? how?A. Yes. We can hold on java objects. BY using setObject(),setBlob() and setClob() methods in PreparedStatement14 what do u mean by isolation level?A. Isolation means that the business logic can speak withoutconsideration for the other activities of the system.15. How do u set the isolation level?A. By using setTransactionIsolation(int aim) in java sql. Connection interface level MEANS:-static final int TRANSACTION_construe_UNCOMMITTED //cannot prevent any reads static final int TRANSACTION_READ_COMMITTED //prevents dirty readsstatic final int TRANSACTION_REPEATABLE_READ //prevents dirty reads & non-repeatable read static final int TRANSACTION_SERIALIZABLE //prevents alter reads non-repeatable read & phantom construe. These are the static final fields in java sql. Connection interface.16 what is a dirty read?A. A Dirty read allows a row changed by one transaction to beread by another transaction before any change in the rowhave been committed. This problem can be solved by setting the transaction isolationlevel to TRANSACTION_READ_COMMITTED17 what is a non-repeatable read ?A. A non-repeatable read is where one transaction reads a row a secondtransaction alters or deletes the row and the first transactionre-reads the row,getting different values the second measure. This problem can be solved by setting the transaction isolationlevel to TRANSACTION_REPEATABLE_construe18 what is phantom construe?A. A phantom read is where one transaction reads all rows that satisfy a WHERE condition,a second transaction inserts a row that satisfies that WHERE condition,and the first transaction re-reads for the same condition,retrieving the additional ‘phantom’ row in the second construe This problem can be solved by setting the transaction isolation aim to TRANSACTION_SERIALIZABLE19. What is the difference between java sql. Statement &java sql. PreparedStatement ?A create verbally the appropriate situations to use these statements?20. How to retrieve the information about the database ?A we can retrieve the info about the database by using inerface java sql. DatabaseMetaData we can get this object by using getMetaData() method in Connection interface.21 what are the Different types of exceptions in jdbc?A. BatchUpdateExceptionDataTruncationSQLExceptionSQLWarning22. How to execute no of queries at one go?A. By using a batchUpdate’s (ie throw addBAtch() and executeBatch()) in java sql. Statement interface,or by using procedures.23 what are the advantages of connection pool. A. Performance24. In which interface the methods commit() & rollback() are defined ?A java sql. Connection interface25. How to store images in database?A. Using binary streams (ie getBinaryStream() ,setBinaryStream()). But it is not visable in database ,it is stored in create of bytes ,to make it visable we have to use any one frontend tool.26. How to analyse null value in JDBC?A. By using the method wasNull() in ResultSet ,it returns boolean value. Returns whether the measure column read had a value of SQL NULL. Note that you must first call one of the getXXX methods on a column to try to read its determine and then call the method wasNull to see if the determine construe was SQL NULL.27. furnish one Example of static Synchronized method in JDBC API?A getConnection() method in DriverManager class. Which is used to get object of Connection interface.28. What is a Connection?A. Connection is an interface which is used to make a connection between client and Database (ie opening a session with a particular database).29 what is the difference between kill() ,executeUpdate() and executeQuery() ? where we will use them?A kill() method returns a boolean value (ie if the given ask returns a resutset then it returns adjust else false),so depending upon the go value we can get the ResultSet object (getResultset())or we can experience how many rows undergo bean affected by our query (getUpdateCount()). That is we can use this method for Fetching queries and Non-Fetching queries. Fetching queries are the queries which are used to fetch the records from database (ie which returns resutset) ex: Select * from emp. Non-Fetching queries are the queries which are used to update,attach,create or delete the records from databaseex: modify emp set sal=10000 where empno=7809 executeUpdate() method is used for nonfetching queries which returns int value executeQuery() method is used for fetching queries which returns ResulSet disapprove ,Which contains methods to fetch the values.30. How is jndi useful for Database connection?

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5. How can I use the JDBC API to access a desktop database like Microsoft Access over the network?Most desktop databases currently demand a JDBC solution that uses ODBC underneath. This is because the vendors of these database products haven’t implemented all-Java JDBC drivers. The beat approach is to use a commercial JDBC driver that supports ODBC and the database you want to use. See the JDBC drivers summon for a list of available JDBC drivers. The JDBC-ODBC bridge from Sun’s Java Software does not provide network access to desktop databases by itself. The JDBC-ODBC bridge loads ODBC as a local DLL and typical ODBC drivers for desktop databases desire Access aren’t networked. The JDBC-ODBC connect can be used together with the RMI-JDBC bridge however to access a desktop database like find over the net. This RMI-JDBC-ODBC solution is free.6. Does the JDK consider the JDBC API and the JDBC-ODBC Bridge?Yes the JDK 1.1 and the Java 2 SDK. Standard Edition (formerly known as the JDK 1.2) contain both the JDBC API and the JDBC-ODBC Bridge. The Java 2 SDK. Standard Edition contains the JDBC 2.0 core API which is the latest version. It does not include the JDBC 2.0 Optional Package which is part of the Java 2 SDK. Enterprise Edition or which you can download separately. say that the version of the JDBC API and the JDBC-ODBC Bridge provided for displace download on the JDBC download page are only for use with the JDK 1.0.2.7. What JDBC technology-enabled drivers are available?See our web page on JDBC technology-enabled drivers for a current listing.8. What documentation is available for the JDBC API?See the JDBC technology home summon for links to information about JDBC technology. This summon links to information about features and benefits a list of new features a divide on getting started online tutorials a section on driver requirements and other information in addition to the specifications and javadoc documentation.9. Are there any ODBC drivers that do not work with the JDBC-ODBC Bridge?Most ODBC 2.0 drivers should work with the Bridge. Since there is some variation in functionality between ODBC drivers the functionality of the bridge may be affected. The bridge works with popular PC databases such as Microsoft Access and FoxPro.10. Does the JDBC-ODBC connect bring home the bacon with Microsoft J++?No. J++ does not support the JDBC-ODBC bridge since it doesn’t implement the Java Native Interface (JNI). Any all-Java JDBC driver should work with J++ however.11. What causes the "No suitable driver" error?"No suitable driver" is an error that usually occurs during a label to the DriverManager getConnection method. The create can be failing to load the allot JDBC drivers before calling the getConnection method or it can be specifying an invalid JDBC URL—one that isn’t recognized by your JDBC driver. Your beat bet is to check the documentation for your JDBC driver or contact your JDBC driver vendor if you guess that the URL you are specifying is not being recognized by your JDBC driver. In addition when you are using the JDBC-ODBC connect this error can occur if one or more the the shared libraries needed by the Bridge cannot be loaded. If you think this is the create analyse your configuration to be sure that the shared libraries are accessible to the Bridge.12. Why isn’t the java sql. DriverManager class being open?This problem can be caused by running a JDBC applet in a browser that supports the JDK 1.0.2 such as Netscape Navigator 3.0. The JDK 1.0.2 does not contain the JDBC API so the DriverManager categorise typically isn’t open by the Java virtual forge running in the browser. Here’s a solution that doesn’t require any additional configuration of your web clients. Remember that classes in the java.* packages cannot be downloaded by most browsers for security reasons. Because of this many vendors of all-Java JDBC drivers supply versions of the java sql.* classes that undergo been renamed to jdbc sql.* along with a version of their driver that uses these modified classes. If you import jdbc sql.* in your applet code instead of java sql.* and add the jdbc sql.* classes provided by your JDBC driver vendor to your applet’s codebase then all of the JDBC classes needed by the applet can be downloaded by the browser at run time including the DriverManager class. This solution will allow your applet to bring home the bacon in any client browser that supports the JDK 1.0.2. Your applet will also work in browsers that support the JDK 1.1 although you may want to switch to the JDK 1.1 classes for performance reasons. Also keep in mind that the solution outlined here is just an example and that other solutions are possible.13. Why doesn’t calling the method Class forName load my JDBC driver?There is a bug in the JDK 1.1 x that can cause the method categorise forName to disappoint. A workaround is to explicitly call the method DriverManager registerDriver(new YourDriverClass()). The exact problem in the JDK is a race condition in the class loader that prevents the static section of code in the driver categorise from executing and registering the driver with the DriverManager.14. Why do the java sql and java math packages fail to transfer java.* packages? Is there a workaround?For security reasons browsers will not download java.* packages. In request to use the JDBC API with browsers that have not been upgraded to JDK1.1 or beyond we recommend that the java sql and java math packages be renamed jdbc sql and jdbc math. Most vendors supplying JDBC technology-enabled drivers that are written purely in the Java programming language already provide versions of these renamed packages. When JDK 1.1 give has been added to your browser you should convert your applets back to the java.* package names.15. Why is the precision of java math. BigDecimal limited to 18 digits in the JDK 1.0.2 add-on version of the JDBC API?In JDK 1.1 java math. BigInteger is implemented in C. It supports a precision of thousands of digits. The same is true for BigDecigmal. The version of BigInteger provided with the JDK 1.0.2 add-on version of the JDBC API is a simplified version written in the Java programming language and it is limited to 18 digits. Because the implementation of BigDecimal is based on BigInteger it also is limited to this precision. In the JDBC 2.0 API you can use a new version of the method ResultSet getBigDecimal that does not act a scale parameter and returns a BigDecimal with full precision.16. Can the JDBC API be added to JDK 1.0.2?Yes. Download the JDBC 1.22 API from the JDBC transfer page and follow the installation instructions in the channel notes. If you are using any version of the JDK from 1.1 on the JDBC API is already included and you should not transfer the JDBC 1.22 API.17. How do I retrieve a whole row of data at once instead of calling an individual ResultSet getXXX method for each column?The ResultSet getXXX methods are the only way to acquire data from a ResultSet object which means that you have to make a method call for each column of a row. It is unlikely that this is the cause of a performance problem however because it is difficult to see how a column could be fetched without at least the cost of a function label in any scenario. We accept input from developers on this issue.18. Why does the ODBC driver manager return ‘Data source name not found and no default driver specified Vendor: 0’This type of error occurs during an attempt to connect to a database with the bridge. First note that the error is coming from the ODBC driver manager. This indicates that the bridge-which is a normal ODBC client-has successfully called ODBC so the problem isn’t due to native libraries not being present. In this inspect it appears that the error is due to the fact that an ODBC DSN (data source label) needs to be configured on the client machine. Developers often drop to do this thinking that the bridge will magically find the DSN they configured on their remote server forge19. Are all the required JDBC drivers to establish connectivity to my database part of the JDK?No. There aren’t any JDBC technology-enabled drivers bundled with the JDK 1.1 x or Java 2 Platform releases other than the JDBC-ODBC Bridge. So developers need to get a driver and lay it before they can connect to a database. We are considering bundling JDBC technology- enabled drivers in the future.20. Is the JDBC-ODBC Bridge multi-threaded?No. The JDBC-ODBC Bridge does not give concurrent access from different threads. The JDBC-ODBC connect uses synchronized methods to arrange all of the calls that it makes to ODBC. Multi-threaded Java programs may use the connect but they won’t get the advantages of multi-threading. In addition deadlocks can occur between locks held in the database and the sign used by the Bridge. We are thinking about removing the synchronized methods in the future. They were added originally to make things simple for folks writing Java programs that use a single-threaded ODBC driver.21. Does the JDBC-ODBC connect support multiple concurrent open statements per connection?No. You can change state only one Statement object per connection when you are using the JDBC-ODBC Bridge.22. Does the JDBC-ODBC connect developed by Merant and Sun give prove sets that contain Japanese Characters (DBCS)?Yes but we haven’t tested this ourselves. The version of the Bridge in the Java 2 SDK. Standard Edition and Java 2 SDK. Enterprise Edition also supports a new charSet Connection property for specifying the engrave encoding used by the underlying DBMS.23. Why can’t I invoke the ResultSet methods afterLast and beforeFirst when the method next works?You are probably using a driver implemented for the JDBC 1.0 API. You need to upgrade to a JDBC 2.0 driver that implements scrollable prove sets. Also be sure that your code has created scrollable prove sets and that the DBMS you are using supports them.24. How can I acquire a String or other object write without creating a new disapprove each time?Creating and garbage collecting potentially large numbers of objects (millions) unnecessarily can really cause to be perceived performance. It may be exceed to provide a way to acquire data like strings using the JDBC API without always allocating a new object. We are studying this issue to see if it is an area in which the JDBC API should be improved. Stay tuned and please displace us any comments you undergo on this question.25. There is a method getColumnCount in the JDBC API. Is there a similar method to sight the be of rows in a result set?No but it is easy to sight the be of rows. If you are using a scrollable result set rs you can call the methods rs last and then rs getRow to find out how many rows rs has. If the result is not scrollable you can either count the rows by iterating through the result set or get the be of rows by submitting a query with a COUNT column in the decide clause.26. I would desire to download the JDBC-ODBC connect for the Java 2 SDK. Standard Edition (formerly JDK 1.2). I’m a beginner with the JDBC API and I would like to go away with the Bridge. How do I do it?The JDBC-ODBC Bridge is bundled with the Java 2 SDK. Standard Edition so there is no need to download it separately.27. If I use the JDBC API do I have to use ODBC underneath?No this is just one of many possible solutions. We recommend using a pure Java JDBC technology-enabled driver write 3 or 4 in request to get all of the benefits of the Java programming language and the JDBC API.28. Once I have the Java 2 SDK. Standard Edition from Sun what else do I be to cerebrate to a database?You still need to get and lay a JDBC technology-enabled driver that supports the database that you are using. There are many drivers available from a variety of sources. You can also try using the JDBC-ODBC Bridge if you have ODBC connectivity set up already. The connect comes with the Java 2 SDK. Standard Edition and Enterprise Edition and it doesn’t demand any extra setup itself. The connect is a normal ODBC client. Note however that you should use the JDBC-ODBC Bridge only for experimental prototyping or when you undergo no other driver available.16What is a JDBC Driver?A JDBC driver is the set of classes that implement the JDBC interfaces for a particular database. There are four different types of JDBC driver: A Type 1 driver is a JDBC-ODBC bridge driver; this type of driver enables a client to connect to an ODBC database via Java calls and JDBC—neither the database nor middle tier need to be Java compliant. However. ODBC binary code must be installed on each client forge that uses this driver. A write 2 driver converts JDBC calls into calls for a specific database. This driver is referred to as a native-API partly Java driver. As with the Type 1 driver some binary label may be required on the client machine which means this write of driver is not suitable for downloading over a network to a client. A Type 3 driver is a JDBC-Net pure Java driver which translates JDBC calls into a database -independent net protocol. Vendors of database middleware products can implement this type of driver into their products to provide interoperability with the greatest number of database servers. Finally a write 4 driver or native protocol pure Java driver converts JDBC calls into the network protocol used by the database directly. A Type 4 driver requires no client software so it’s ideal for deployment to browsers at runtime. Each of these driver types has its own optimal usage scenarios and ordain alter the way you deploy a given Java application. For example because write 4 drivers are 100% Java use Java sockets to connect to the database and require no client-side data access code they are ideal for applets or other download situations inside a firewall. Oracle’s JDBC DriversOracle provides both Type 2 and Type 4 drivers. All Oracle JDBC drivers support the full JDBC specification but in addition they support the extended capabilities of the Oracle database. For example the JDBC specification doesn’t support LOB data but the Oracle OCI8 JDBC driver does. Oracle’s implementation of the write 2 JDBC driver is referred to as the Oracle "OCI driver," and the version of this driver that supports an Oracle 7 database is the OCI7 driver and the OCI8 supports Oracle 8. These drivers are platform specific; for example the Windows NT and Windows 95 version of the driver (oci805jdbc dll.) is implemented as a dynamic link library (DLL) in C. As mentioned previously. Type 2 drivers may require client code. In the case of the OCI8 driver the clients must undergo Oracle’s Net*8 and all other dependent files loaded. A common way to apply Oracle OCI drivers is to use Oracle Application Server with the JWeb cartridge on the lay tier and deploy the client presentation logic as an applet; the interaction with the Oracle database is conducted from the middle tier only with just the results sent to the client applet as pure HTML or Java and HTML. All Oracle drivers are compliant with the Java Development Kit JDK 1.0 and 1.1 x and support the JDBC 1.22 standard. In addition all Oracle JDBC drivers give data types such as RAW and LONG RAW. ROWID and RECURSOR which are supported in Oracle databases but not move of the JDBC standard. Oracle’s drivers also give execution of PL/SQL stored procedures and anonymous blocks (for dynamic execution) andinclude capabilities such as row pre-fetching execution batching and defining ask columns toreduce the network round trips to Oracle database. In addition the OCI driver for Oracle8 supports oracle data types CLOB. BLOB. NCLOB and BFILE. The screenshot shows an example of one of the classes in the Oracle JDBC as move of the categorise hierarchy from which it descends as displayed in Oracle’s JDeveloper integrated development environment. As you can see the OraclePreparedStatement categorise inherits from the java sql. PreparedStatement class which in turn inherits from the java sql. Statement. Oracle also provides a Type 4 JDBC driver referred to as the Oracle "thin" driver. This driver includes its own implementation of a TCP/IP version of Oracle’s Net8 written entirely in Java so it is platform independent can be downloaded to a browser at runtime and does not demand any Oracle software on the client side. This driver requires a TCP/IP listener on the server side and the client connection string uses the TCP/IP port address not the TNSNAMES entry for the database name.1. Add JDBC classes to your Java application or applet class by adding the following statement to your Java source code:import java sql.*;To use the extended capabilities of the Oracle database you must also import the Oracle JDBC driver. The statement in Java source looks desire this:merchandise oracle. JDBC driver.*2. Load the JDBC driver by including the following statement in your class. Class forName("oracle. JDBC driver. OracleDriver");You can load the driver from your class-initialization routine.3. Obtain a connection to an Oracle database by calling the getConnection() method of the JDBC DriverManager class. When you call this method you need to specify the connection information for the database in the form of a URL. The form the URL will take depends on the driver used. For example to use the pure Java Type 4 Oracle driver (the thin driver) to connect to an Oracle7 database the URL would read:jdbc:oracle:thin@database_name:port_no:SIDTo cerebrate to an Oracle8 database using the OCI driver the URL would be more desire:jdbc:oracle:oci8@database_nameTo specify the database for use with an OCI driver you can use either a SQL*Net name- value unify or if you’re using an Oracle label server you can use the name from the tnsname ora file. (Both of these strings would conclude with the logon information as come up—specifically the user name and password—but we’ve eliminated that from this example.)The preliminary driver and database-connection issues now taken care of there are still several other things your Java source code must consider in order for the compiled code to refer queries to the database and process results.4. act a Statement object by calling the createStatement() method of the Connection object you created in the previous step. The following statement creates a Statement object stmt:Statement stmt = channelise createStatement ();5. Once the Statement object exists (in code) the application can then consider code to kill a SQL query by calling the executeQuery() method of the Statement object. The executeQuery() method returns the prove of the query in the ResultSet object. The following statement executes a ask :ResultSet rset = stmt executeQuery (SELECT ename from emp where empno = 7900);6. Finally call the next() method of a ResultObject to retrieve a row and show it. Use a circle if the query returns more then one row from the database. For example the following statements get the name of an employee from the ResultSet object and display it in the java awt text hold back placed on the GUI rset next();enameTxtb setText = ((arrange)rset getString(1));16JDBC (java database conctivity)1. What is JDBC ? what are its advantages ?A. It is an API. The latest version of jdbc api is (3.0). The JDBC 3.0 API is divided into two packages:(1) java sql and (2) javax sql. Both packages are included in the J2SE and J2EE platforms advantages:The JDBC API can be used to interact with multiple data sources in a distributed heterogenous environment. It can connect to any of the database from java language. It can switch over to any backend database without changing java label or by minute changes.2. How many JDBC Drivers are there ? what are they?A. There are 4 types of JDBC drivers a. JDBC-ODBC Bridge Driver(Type-1 driver)b. Native API Partly Java Driver(Type-2 driver)c. Net protocol pure Java Driver(Type-3 driver)d. Native protocol Pure Java Driver(Type-4 driver)3. Explain about JDBC-ODBC driver(Type-1) ? When this type of driver is used ?A. In this mechanism the flow of execution will beJava label(JDBC API) -------> The syntax of the subname is driver specific. The driver may choose any syntax allot for its implementationex: jdbc:odbc:dsnjdbc:oracle:oci8:@ database name jdbc:orale:thin:@ database label:port be:SID10. How do u fill a driver ?A. Using Driver Class forName(java lang. arrange driverclass) or registerDriver(Driver driver) .11 what are the types of resultsets in JDBC3.0 ?How you can acquire information of resultset?A. ScrollableResultSet and ResultSet. We can retrieve information of resultset by using java sql. ResultSetMetaData interface. You can get the dilate by calling the method getMetaData() on ResulSet object.12 write the steps to Connect database?A. categorise forName(The class label of a spasific driver);Connection c=DriverManager getConnection(url of a spasific driver,user name,password);Statement s=c createStatement();(or)PreparedStatement p=c prepareStatement();(or)CallableStatement cal=c prpareCall();Depending upon the requirement.13. Can java objects be stored in database? how?A. Yes. We can hold on java objects. BY using setObject(),setBlob() and setClob() methods in PreparedStatement14 what do u mean by isolation aim?A. Isolation means that the business logic can speak withoutconsideration for the other activities of the system.15. How do u set the isolation level?A. By using setTransactionIsolation(int level) in java sql. Connection interface level MEANS:-static final int TRANSACTION_READ_UNCOMMITTED //cannot prevent any reads static final int TRANSACTION_READ_COMMITTED //prevents dirty readsstatic final int TRANSACTION_REPEATABLE_construe //prevents dirty reads & non-repeatable construe static final int TRANSACTION_SERIALIZABLE //prevents dirty reads non-repeatable construe & phantom read. These are the static final fields in java sql. Connection interface.16 what is a dirty read?A. A alter construe allows a row changed by one transaction to beread by another transaction before any change in the rowhave been committed. This problem can be solved by setting the transaction isolationlevel to TRANSACTION_READ_COMMITTED17 what is a non-repeatable read ?A. A non-repeatable construe is where one transaction reads a row a secondtransaction alters or deletes the row and the first transactionre-reads the row,getting different values the back up time. This problem can be solved by setting the transaction isolationlevel to TRANSACTION_REPEATABLE_READ18 what is phantom construe?A. A phantom read is where one transaction reads all rows that satisfy a WHERE condition,a back up transaction inserts a row that satisfies that WHERE condition,and the first transaction re-reads for the same condition,retrieving the additional ‘phantom’ row in the second read This problem can be solved by setting the transaction isolation aim to TRANSACTION_SERIALIZABLE19. What is the difference between java sql. Statement &java sql. PreparedStatement ?A write the appropriate situations to use these statements?20. How to retrieve the information about the database ?A we can retrieve the info about the database by using inerface java sql. DatabaseMetaData we can get this disapprove by using getMetaData() method in Connection interface.21 what are the Different types of exceptions in jdbc?A. BatchUpdateExceptionDataTruncationSQLExceptionSQLWarning22. How to execute no of queries at one go?A. By using a batchUpdate’s (ie throw addBAtch() and executeBatch()) in java sql. Statement interface,or by using procedures.23 what are the advantages of connection share. A. Performance24. In which interface the methods commit() & rollback() are defined ?A java sql. Connection interface25. How to hold on images in database?A. Using binary streams (ie getBinaryStream() ,setBinaryStream()). But it is not visable in database ,it is stored in form of bytes ,to make it visable we have to use any one frontend tool.26. How to check null determine in JDBC?A. By using the method wasNull() in ResultSet ,it returns boolean value. Returns whether the last column construe had a value of SQL NULL. Note that you must first call one of the getXXX methods on a column to try to construe its determine and then call the method wasNull to see if the value read was SQL NULL.27. Give one Example of static Synchronized method in JDBC API?A getConnection() method in DriverManager categorise. Which is used to get object of Connection interface.28. What is a Connection?A. Connection is an interface which is used to make a connection between client and Database (ie opening a session with a particular database).29 what is the difference between execute() ,executeUpdate() and executeQuery() ? where we will use them?A kill() method returns a boolean determine (ie if the given ask returns a resutset then it returns true else false),so depending upon the go determine we can get the ResultSet disapprove (getResultset())or we can know how many rows have hit affected by our query (getUpdateCount()). That is we can use this method for Fetching queries and Non-Fetching queries. Fetching queries are the queries which are used to fetch the records from database (ie which returns resutset) ex: Select * from emp. Non-Fetching queries are the queries which are used to update,insert,create or delete the records from databaseex: update emp set sal=10000 where empno=7809 executeUpdate() method is used for nonfetching queries which returns int determine executeQuery() method is used for fetching queries which returns ResulSet object ,Which contains methods to fetch the values.30. How is jndi useful for Database connection?

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HelloWorldApp یک مثال از یک Java application است. یک برنامهء standalone. حالا شما یک Java Applet به نام  HelloWorld که بازهم "Hello World!" را نشان میدهد. برخلاف HelloWorldApp ؛appletها تحت Java-enabled Web browser هایی مانند HotJava، Netscape Navigator، یا Microsoft Internet Explorer اجرا میشوند. برای ساختن این applet، مراحلی شبیه به همان مراحل قبلی را طی میکنیم: یک فایل جاوا میسازیم؛ آنرا compile میکنیم؛ و آنرا اجرا میکنیم. هرچند که میتوانید applet خود را در یک Web browser ببینید، ممکن است راحتتر باشید که از applet viewer application استفاده کنید که همراه Java Platform میباشد. برای دیدن این applet با استفاده از appletviewer ؛ در prompt دستور زیر را وارد کنید:

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Welcome to LinuxQuestions org a friendly and active Linux Community. You are currently viewing LQ as a guest. By joining our free community you will have find to post topics acquire our newsletter use the advanced examine bid to threads and access many other special features. Registration is abstain simple and absolutely remove so please. !Note that registered members see fewer ads and ContentLink is completely disabled for all logged in members. If you undergo any problems with the registration process or your account login please. Linux - Newbie This forum is for members that are new to Linux. Just starting out and have a challenge?If it is not in the man pages or the how-to's this is the place! Hai alli m using fc6 i wrote 1 simple applet program label is given below drawString answer is not displaying anything in the applet window applet is initiated & started i set accent color in init function its properly set its entering into create answer but not displaying the drawString import java awt. Graphics;merchandise java applet.*;merchandise java awt.*;public categorise applet1 extends Applet{public void init(){setBackground(alter red);}public cancel paint(Graphics g){System out println("inside paint function");g drawString("This is a simple java applet!". 100. 200);}}this is my html code(consume html)<html><body><APPLET CODE="applet1 categorise" WIDTH=500 HEIGHT=500></APPLET></be></html>i compiled desire this>javac applet1 javaclass file is created to run i used like thisi used >appletviewer consume htmli dont know the problem thanks in advance. I can't see anything do by with your code. I've tested in Eclipse and it is working. What happens if you change state the html register with a browser? It could also be that for some odd cerebrate the String is being draw outside the applet. Try to set the position to 10. 10 instead 100. 200 and see if that helps. Try also setting different colours in the paint method before drawing the arrange (g setColor(Color white) for example). If that comfort does not back up. I don't know what the problem is. A little on call though: Try to name all classes you create in Java with the first earn in uppercase (in this case. Applet1). It won't alter your code at all but it is encouraged to do so in request to keep consistence with the rest of Java classes. Good luck! I can't see a problem either. I did exactly as you described used javac and appletviewer and it works for me. What Java version are you using? haifirstof all thanks i tried urs i set the alter before drawString i changed the lay to 10,10 now also its not working actually i m using mozilla first i tried to open that html file only it said some close in missing then only i changed 2 appletviewer. Can you post the output of running java -version in a console/command prompt please?Do any of the other Graphics class methods bring home the bacon i e drawLine drawRect etc?? LinuxQuestions org is looking for people interested in writingEditorials. Articles. Reviews and more. If you'd desire to contributecontent. .

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Ok. I have created a fairly simple applet that works come up in appletviewer but of course it has problems in browsers because of two features: It reads a file and displays an image. Both of these files are packed in the jar file and when I try to create a bufferedreader to read the text or when I try to use the image i gives the classic Access denied exception. I don't have find to the final server this communicate ordain run from so I can't edit the policy file and I'd like not to undergo to give a certificate dialog everytime this runs. It's not desire i'm trying to find the user's hard-drive or the internet or anything just read a file in the same archive as the categorise files. How can I get find to these things in the browser? Thanks for your help. You may be able to access the data using the techniques described in this tutorial:http://java sun com/docs/books/tutorial/deployment/applet/index html

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Ok. I undergo created a fairly simple applet that works well in appletviewer but of cover it has problems in browsers because of two features: It reads a file and displays an visualise. Both of these files are packed in the jar register and when I try to create a bufferedreader to read the text or when I try to use the image i gives the classic Access denied exception. I don't undergo access to the final server this project will run from so I can't edit the policy file and I'd prefer not to undergo to give a certificate dialog everytime this runs. It's not desire i'm trying to find the user's hard-drive or the internet or anything just read a file in the same collect as the categorise files. How can I get access to these things in the browser? Thanks for your help. You may be able to access the data using the techniques described in this tutorial:http://java sun com/docs/books/tutorial/deployment/applet/list html

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Ok. I have created a fairly simple applet that works well in appletviewer but of course it has problems in browsers because of two features: It reads a file and displays an visualise. Both of these files are packed in the jar register and when I try to act a bufferedreader to read the text or when I try to use the image i gives the classic Access denied exception. I don't have access to the final server this project ordain run from so I can't edit the policy register and I'd prefer not to have to give a certificate dialog everytime this runs. It's not desire i'm trying to access the user's hard-drive or the internet or anything just construe a file in the same collect as the categorise files. How can I get access to these things in the browser? Thanks for your help. You may be able to access the data using the techniques described in this tutorial:http://java sun com/docs/books/tutorial/deployment/applet/index html

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Hi,I'm trying to install java on my pc so my girlfriend can play those games of msn but when I try to install at the end I get this: bin\appletviewer exe: Old register not open. However a file of the same label was open. No updates done since register contents does not match. If it's not bin\appletviewer exe then it's bin\java exe. If it changes then I did it with another update. I really don't get it because the same program I used my brother also installed it on his pc and works just book. I have the newest update and 2 old ones and same sad storyPLease and thank u for some info I'm so egest infected with where I live let me be without this empty bliss selfishness. I'm so egest - FlyleafGod. I want to cater them! The thing is i don't change surface have older versions. It was the first measure that I wanted to install it and I didn't do anything except furnish me those errors. This is what it gives me:bin\appletviewer exe: Old file not found. However a register of the same name was open. No updates done since file contents does not match provide the suggestion for this problem as iam unable to lay the java in my system i e windows xp sp2 professionalI just ran a search in their forum and I found 3 replies. I undergo the same problem those guys have and I allready did those things. So I'll give it another try and ordain act postin if there are any changes. Lates I'm so sick infected with where I be let me live without this empty bliss selfishness. I'm so sick - FlyleafGod. I want to cater them! Hey,it didn't work at all. On the java forum they said that I needed to uninstall the program examine for all java files containing bin:\java exe and bin:\appletviewer exe remove them. Fix errors of your harddrives start and install again. First time. I had the same problem. Nothing changed. The second time. I installed it on another plough and was starting to get hope because it did the same cram like it did on my brothers computer but my ad-watch blocked it and then did the same thing again. Third measure I tried nothing happend. I'm really getting frustrated alter now I'm so sick infected with where I live let me be without this empty bliss selfishness. I'm so egest - FlyleafGod. I be to cater them! Hi thanks for the returning coments and advises but sadly I had to create the machine. The weird move about it was that this measure there were no problems. So I asked someone what the problem could've been and since I had done everything he asked he asked me if I updated the windows security. And he said that maybe that would've been my problem. The new updates searches the system if it's an original copy and since I've been using a copy it locked most of my settings. Wel now I did e fresh a go away so. I'll be getting my d-loads on haha. LAter dudes I'm so egest infected with where I be let me live without this empty bliss selfishness. I'm so sick - FlyleafGod. I be to meet them!

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- برنامه کامپيوتر . يک برنامه کامپيوتری ، مجموعه ای از دستورالعمل ها بوده که به کامپيوتر اعلام می کنند ، چه کاری را می بايست انجام دهد. دستورالعمل ها ممکن است به کامپيوتر اعلام نمايند ، که تعدادی از اعداد را با يکديگر جمع کرده و يا دو عدد را بايکديگر مقايسه و بر اساس نتيجه مربوط اتخاذ تصميم نمايد. يک برنامه کامپيوتری صرفا" مجموعه ای از دستورالعمل های ساده بوده که فقط برای کامپيوتر قابل استفاده می باشند. نظير نوت های موسيقی که بعنوان مجموعه دستورالعمل هائی برای يک موسيقيدان مفيد خواهند بود.کامپيوتر دستورالعمل های نوشته شده را اجراء و ماحصل آن رسيدن به هدفی خواهد بود که بر اساس آن برنامه نوسته شده  است . - کمپايلر. برنامه ای است که برنامه نوشته شده توسط يکی از زبانهای برنامه نويسی (نظير جاوا) را ترجمه و آن را بگونه ای تبديل خواهد کرد که کامپيوتر قادر به اجرای آن باشد. احتمالا" شما بر روی کامپيوتر خود فايل هائی با انشعاب exe را تاکنون مشاهده کرده ايد ، اين نوع فايل ها شامل کدهای اجرائی ( قابل خواندن توسط ماشين ) بوده که مرحله ترجمه خود را پشت سر گذرانده اند. پنجره MS-DOS ويندوز را فعال و دستور Javac را تايپ نمائيد. در صورتيکه مراحل قبل بدرستی انجام شده باشند ، می بايست پيامی مبنی بر نحوه استفاده از Javac بر روی مانيتور نمايش داده شود. اين بدان معنی است که همه چيز برای شروع آماده است . در صورتيکه پيام "Bad coomand or file name" ، نمايش داده شود ، نشاندهنده برزو اشکال در يکی از مراحل نصب بوده است . بمنظور ذخيره نمودن برنامه ، فولدری با نام دلخواه ايجاد تا برنامه در آن ذخيره گردد. در ادامه ويرايشگر Notepad ( و يا هر اديتور متنی ديگری که قادر به ايجاد فايل های با انشعاب TXT باشد ) را فعال و برنامه فوق را تايپ ( و يا Copy و Paste) نمائيد. در زمان تايپ برنامه فوق می بايست در رابطه با حروف بزرگ و کوچک دقت لازم صورت پذيرد. در اين رابطه لازم است که حروف بزرگ و کوچک دقيقا" مشابه جدول فوق ، تايپ گردند. برنامه نوشته شده يک اپلت ساده جاوا است . اپلت  ، نوع خاصی از برنامه های جاوا بوده که می توان آنها را در يک مرورگر اجراء کرد. اپلت های جاوا در مقابل برنامه های کاربردی جاوا مطرح شده اند. برنامه های کاربردی جاوا ، برنامه هائی بوده که می توان آنها را بر روی يک ماشين محلی اجراء نمود. برای کمپايل نمودن اپلت از برنامه javac استفاده شده است . در ادامه بمنظور تگهداری اپلت و فراهم نمودن محيط لازم برای اجرای آن ، يک صفحه وب ايجاد و اپلت در صفحه فوق صدا زده شده است . برای اجرای يک اپلت می توان از برنامه appletviewer  نيز استفاده کرد. در صفحه وب ، اندازه پنجره مربوط به اجراء و نمايش اپلت ( در مرحله پنج ) به ابعاد 200 و 200 مشخص شده است. در برنامه فوق از متدی ( تابع )  با نام drawLine استفاده شده است . متد فوق ، چهار پارامتر را بعنوان ورودی اخذ می نمايد (0,0,200,200) . انتهای خط با استفاده از کاراکتر ";"  مشخص شده است .  نقش کاراکتر فوق نظير استفاده از نقطه در انتهای جملات است . ابتدای خط با حرف g. شروع شده است . بدين ترتيب مشخص شده است که قصد  فراخوانی متدی با نام drawLine با نام شی g وجود دارد. از چه توابع ديگری بجز drawLine می توان استفاده کرد ؟ بدين منظور لازم است که به مستندات مربوط به کلاس Graphice مراجعه گردد. در زمان نصب محيط پياده سازی جاوا و مستندات مربوطه ، يکی از فايل هائی که بر روی سيستم شما نصب خواهد شد ، فايل java awt. Graphice html است . فايل فوق کلاس Graphic را تشريح می نمايد drawLine  صرفا" يکی از متدهای کلاس Graphic بوده و در اين زمينه متدهای متعدد ديگر بمنظور رسم خطوط ، کمان ، چند ضلعی، تغيير  و  ... وجود دارد. جاوا دارای کلاس های متعدد بوده و هر کلاس نيز دارای متدهای فراوانی است . مثلا" کلاس Color دارای مجموعه ای از متدها بمنظور تعريف و نتظيمات مربوط به رنگ است . SetColor نمونه ای در اين زمينه است . در زمان استفاده هاز هر يک از متدهای مربوط به کلاس های جاوا می بايست در ابتدای برنامه با استفاده از دستور import زمينه استفاده از آنان را فراهم کرد. در زمان نوشتن برنامه های کامپيوتری ، ممکن است به خطاهای متفاوت برخورد نمائيم . خطاهای  برنامه نويسی دارای انواع متفاوتی نظير : خطای گرامری ، خطای زمان اجراء و خطای منطقی می باشند. تمام خطاهای فوق صرفنظر از ماهيت مربوطه را ، اشکال (Bugs) گفته و عمليات مربوط به برطرف کردن اشکال را اشکال زدائی (debugging) می گويند. اشکال زدائی برنامه های کامپيوتری همواره زمان زيادی از وقت برنامه نويسان را بخود اختصاص خواهد داد. در زمان نوشتن يک برنامه در صورتيکه مجموعه قوانين موجود در رابطه با زبان برنامه نويسی رعايت نگردد ( مثلا" عدم استفاده از کاراکتر ";" در انتهای جملات در جاوا ) ، کمپايلر در زمان ترجمه برنامه ، يک خطای گرامری را تشخيص و اعلام می نمايد .  در چنين مواردی می بايست قبل از هر اقدام ديگر ، نسبت به برطرف نمودن اشکال گزارش داده شده ، اقدام کرد. پس از ترجمه موفقيت آميز يک برنامه ( عدم وجود خطای گرامری ) ، برنامه اجراء می گردد..

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What is an Applet? Should applets undergo constructors? - Applets are small programs transferred through Internet automatically installed and run as part of web-browser. Applets implements functionality of a client. Applet is a dynamic and interactive schedule that runs inside a Web page displayed by a Java-capable browser. We don't undergo the concept of Constructors in Applets. Applets can be invoked either through browser or through Appletviewer utility provided by JDK. How do Applets differ from Applications? - Following are the main differences: Application: Stand Alone doesn't needweb-browser. Applet: Needs no explicit installation on local forge. Can be transferred through Internet on to the local forge and may run as move of web-browser. Application: Execution starts with main() method. Doesn't work if main is not there. Applet: Execution starts with init() method. Application: May or may not be a GUI. Applet: Must run within a GUI (Using AWT). This is essential feature of applets. How do we read number information from my applet's parameters given that Applet's getParameter() method returns a string? - Use the parseInt() method in the Integer Class the Float(String) constructor or parseFloat() method in the categorise Float or theDouble(String) constructor or parseDoulbl() method in the class Double. How can I lay for different applets on a web summon to communicate with each other? - label your applets inside the Applet tag and invoke AppletContext's getApplet() method in your applet code to obtain references to theother applets on the page. How do I cause the width and height of my application? - Use the getSize() method which the Applet class inherits from the Component class in the Java awt package. The getSize() method returns the size of the applet as a Dimension object from which you remove separate width height fields. The following code snippet explains this: What are the Applet's information methods? - The following are the Applet's information methods: getAppletInfo() method: Returns a arrange describing the applet its author procure information etc getParameterInfo( ) method: Returns an arrange of string describing the applet's parameters. Which method is used to output a string to an applet? Which function is this method included in? - drawString( ) method is used to output a arrange to an applet. This method is included in the paint method of the Applet.

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What is an Applet? Should applets have constructors? - Applets are small programs transferred through Internet automatically installed and run as move of web-browser. Applets implements functionality of a client. Applet is a dynamic and interactive program that runs inside a Web page displayed by a Java-capable browser. We don't have the concept of Constructors in Applets. Applets can be invoked either through browser or through Appletviewer utility provided by JDK. How do Applets differ from Applications? - Following are the main differences: Application: Stand Alone doesn't needweb-browser. Applet: Needs no explicit installation on local machine. Can be transferred through Internet on to the local machine and may run as part of web-browser. Application: Execution starts with main() method. Doesn't work if main is not there. Applet: Execution starts with init() method. Application: May or may not be a GUI. Applet: Must run within a GUI (Using AWT). This is essential feature of applets. How do we construe be information from my applet's parameters given that Applet's getParameter() method returns a string? - Use the parseInt() method in the Integer categorise the go(String) constructor or parseFloat() method in the categorise Float or theDouble(arrange) constructor or parseDoulbl() method in the categorise manifold. How can I arrange for different applets on a web page to communicate with each other? - Name your applets inside the Applet tag and create AppletContext's getApplet() method in your applet code to acquire references to theother applets on the page. How do I cause the width and height of my application? - Use the getSize() method which the Applet class inherits from the Component class in the Java awt package. The getSize() method returns the size of the applet as a Dimension object from which you extract separate width height fields. The following code snippet explains this: What are the Applet's information methods? - The following are the Applet's information methods: getAppletInfo() method: Returns a string describing the applet its compose copyright information etc getParameterInfo( ) method: Returns an array of string describing the applet's parameters. Which method is used to create a string to an applet? Which answer is this method included in? - drawString( ) method is used to create a string to an applet. This method is included in the create method of the Applet.

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Java Applet Test instantiationi of IoC. Right. I was thinking of doing something to my java applets to make them exceed on the web. Can an applet be rewritten to function in flashFX and what is the benefit? Or is there something else I should consider? . Hi to everybody. I am developing a Java applet that downloads ZIP files through HTTP remove the content of these ZIP archives to a temporary. Java Applet Desktoptwo - Not only do you get 1GB of space you get a fully-featured OpenOffice org suite. No not a basic online editor that has simple formatting options. The full OpenOffice org 2.0 suite from Sun converted into a Java applet hit the books the core concepts and issues relating to Java/J2EE in an easy to understand questions and answers come. Covering over 220 interview questions and answers on: Java. J2EE. Applet. Servlets. JSP. EJB. JNDI. RMI. JDBC. LDAP. JMS. Java Applet Tutorial So if there is > no jar or categorise file during enumeration you > cannot use any compiler to decompile any java > file correct me if im wrong? If there's a java applet there has to be a class or jar file. The method described above will that the jar file is at: http://mindprod com/applet/encodings jar transfer it extract the files and decompile them. I like [url=http://www kpdus com/jad html]jad[/url] for it's simplicity. I liked Hacking Exposed: J2EE & Java Java Applet transfer As for the jar files and cram i do understand as for what Ronald and Gareth and guys are discussing about i have no absolute idea what is going on :( hehe sorry it's gone way off locate. But it was interesting I thought. Java Applet Example A Java applet is an applet delivered in the form of Java bytecode. 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For example providing filters and proxy tools. I also undergo OWASP-LAPSE on my mind. I still have to evaluate it Hai. The following is a java code for generating a keypair. How i can alter this code into applet suppose i be to showthe public & Java Applet evaluate Once the categorise files are extracted you should be able to decompile them using any java decompiler. The HTML applet tag should cerebrate to the jar or class register if the applet is used on a web summon that you can access then you should be able hey Om your post is what i meant. So if there is no jar or class file during enumeration you cannot use any compiler to decompile any java register change by reversal me if im wrong? I am going to get the oreilly java security schedule today Java Applet to any flash java applet bet sites it goes wild and spikes to that 95 -100 percent. Any ideas what I need to tweak to avoid getting those spikes. 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Java Applet evaluate instantiationi of IoC. alter. I was thinking of doing something to my java applets to make them exceed on the web. Can an applet be rewritten to function in flashFX and what is the benefit? Or is there something else I should consider? . Hi to everybody. I am developing a Java applet that downloads ZIP files through HTTP extract the content of these ZIP archives to a temporary. Java Applet Desktoptwo - Not only do you get 1GB of space you get a fully-featured OpenOffice org suite. No not a basic online editor that has simple formatting options. The full OpenOffice org 2.0 suite from Sun converted into a Java applet Learn the core out concepts and issues relating to Java/J2EE in an easy to understand questions and answers come. Covering over 220 converse questions and answers on: Java. J2EE. Applet. Servlets. JSP. EJB. JNDI. RMI. JDBC. LDAP. JMS. 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I saved the file of the process I was running as I doing this and my system is okay gratify back up me to solve this problem the assign is to calculate the total determine of ticket for a family where age is consider to determine the. Java Applet Tutorial Hi Ronald Have you tried using images? @Om Yup. I don't understand why Mozilla allows to call cram on this way. Anyway I didn't find any way to apply this air if anyone wants to choose it up be my guest here is what I experience: [code] view-source:resource:///updater exe. Java Applet Download They find in hard to navigate complicated menu systems implemented for example.

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110 Introduction to Java Applets Chapter 3 Fig. 3.2Sample execution of the TicTacToeapplet. Fig. Testing and Debugging Tip 3.3 If the appletviewer command does not bring home the bacon and/or the system indicates that the appletviewer dominate cannot be found the PATH environment variable may not be defined properly on your computer. analyse the installation directions for the Java 2 Software Development Kit to ensure that the PATH environment variable is defined correctly for your system (on some computers you may need to start your computer after modifying the PATH environment variable). You are player X. To interact with the applet point the mouse at the square where you want to place an X and click the mouse button (normally the left mouse button). The applet plays a sound (assuming your computer supports audio playback) and places an X in the form if the form is change state. If the form is occupied this is an remove move and the applet plays a different sound indicating that you cannot alter the specified act. After you alter a valid move the applet responds by making its own act (this happens quickly). To play again re-execute the applet by clicking the appletviewer s Applet menu and selecting the charge menu item (Fig. 3.3). To terminate the appletviewer click the appletviewer s Applet menu and decide the Quit menu item. Reload the applet to kill it again. Select Quit to alter the appletviewer. Fig. 3.3Selecting Reload from the appletviewer s Applet menu. Fig. Copyright 1992 2002 by Deitel & Associates. Inc. All Rights Reserved. 7/2/01 This entry was posted on Thursday. August 16th. 2007 at 2:16 pmand is filed under. You can follow any responses to this entry through the feed. You can or from your own place.

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