addwindowlistener

import java awt. GridBagConstraints;import java awt. GridBagLayout;import java awt. Insets;import java awt event. ActionEvent;import java awt event. ActionListener;import java awt event. WindowAdapter;import java awt event. WindowEvent;import java io. File;import javax swing. DefaultComboBoxModel;import javax swing. JButton;import javax swing. JCheckBox;import javax swing. JComboBox;import javax swing. JFileChooser;import javax swing. JFrame;import javax swing. JLabel;import javax swing. JScrollPane;import javax swing. JTextArea;import javax swing. JTextField;import org apache commons httpclient. HttpClient;import org apache commons httpclient. HttpStatus;import org apache commons httpclient methods. PostMethod;import org apache commons httpclient methods multipart. FilePart;import org apache commons httpclient methods multipart. MultipartRequestEntity;import org apache commons httpclient methods multipart. Part;import org apache commons httpclient params. HttpMethodParams;public class MultipartFileUploadApp { public static void main(String[] args) { MultipartFileUploadFrame f = new MultipartFileUploadFrame(); f setTitle("HTTP multipart file upload application"); f pack(); f addWindowListener( new WindowAdapter() { public void windowClosing(WindowEvent e) { System exit(0); } } ); f setVisible(true); } public static class MultipartFileUploadFrame extends JFrame { private File targetFile; private JTextArea taTextResponse; private DefaultComboBoxModel cmbURLModel; public MultipartFileUploadFrame() { String[] aURLs = { "...." }; cmbURLModel = new DefaultComboBoxModel(aURLs); final JComboBox cmbURL = new JComboBox(cmbURLModel); cmbURL setToolTipText("URL to Upload"); cmbURL setEditable(false); cmbURL setSelectedIndex(0); JLabel lblTargetFile = new JLabel("Selected file:"); final JTextField tfdTargetFile = new JTextField(30); tfdTargetFile setEditable(false); final JCheckBox cbxExpectHeader = new JCheckBox("Use Expect header"); cbxExpectHeader setSelected(false); final JButton btnDoUpload = new JButton("Upload"); btnDoUpload setEnabled(false); final JButton btnSelectFile = new JButton("Select a file..."); btnSelectFile addActionListener( new ActionListener() { public void actionPerformed(ActionEvent evt) { JFileChooser chooser = new JFileChooser(); chooser setFileHidingEnabled(false); chooser setFileSelectionMode(JFileChooser. FILES_ONLY); chooser setMultiSelectionEnabled(false); chooser setDialogType(JFileChooser. OPEN_DIALOG); chooser setDialogTitle("Choose a file..."); if ( chooser showOpenDialog(MultipartFileUploadFrame this) == JFileChooser. APPROVE_OPTION ) { targetFile = chooser getSelectedFile(); tfdTargetFile setText(targetFile toString()); btnDoUpload setEnabled(true); } } } ); taTextResponse = new JTextArea(10. 40); taTextResponse setEditable(false); final JLabel lblURL = new JLabel("URL:"); btnDoUpload addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { String targetURL = cmbURL getSelectedItem() toString(); // add the URL to the combo model if it's not already there if (!targetURL equals( cmbURLModel getElementAt(cmbURL getSelectedIndex()))) { cmbURLModel addElement(targetURL); } PostMethod upfile_0 = new PostMethod(targetURL); upfile_0 getParams() setBooleanParameter(HttpMethodParams. USE_EXPECT_CONTINUE cbxExpectHeader isSelected()); try { appendMessage("Uploading " + targetFile getName() + " to " + targetURL); Part[] parts = { new FilePart(targetFile getName() targetFile) }; upfile_0 setRequestEntity( new MultipartRequestEntity(parts upfile_0 getParams()) ); HttpClient client = new HttpClient(); client getHttpConnectionManager() getParams() setConnectionTimeout(5000); int status = client executeMethod(upfile_0); if (status == HttpStatus. SC_OK) { appendMessage( "Upload complete response=" + upfile_0 getResponseBodyAsString() ); } else { appendMessage( "Upload failed response=" + HttpStatus getStatusText(status) ); } } catch (Exception ex) { appendMessage("ERROR: " + ex getClass() getName() + " "+ ex getMessage()); ex printStackTrace(); } finally { upfile_0 releaseConnection(); } } }); getContentPane() setLayout(new GridBagLayout()); GridBagConstraints c = new GridBagConstraints(); c anchor = GridBagConstraints. EAST; c fill = GridBagConstraints. NONE; c gridheight = 1; c gridwidth = 1; c gridx = 0; c gridy = 0; c insets = new Insets(10. 5. 5. 0); c weightx = 1; c weighty = 1; getContentPane() add(lblURL c); c anchor = GridBagConstraints. WEST; c fill = GridBagConstraints. HORIZONTAL; c gridwidth = 2; c gridx = 1; c insets = new Insets(5. 5. 5. 10); getContentPane() add(cmbURL c); c anchor = GridBagConstraints. EAST; c fill = GridBagConstraints. NONE; c insets = new Insets(10. 5. 5. 0); c gridwidth = 1; c gridx = 0; c gridy = 1; getContentPane() add(lblTargetFile c); c anchor = GridBagConstraints. CENTER; c fill = GridBagConstraints. HORIZONTAL; c insets = new Insets(5. 5. 5. 5); c gridwidth = 1; c gridx = 1; getContentPane() add(tfdTargetFile c); c anchor = GridBagConstraints. WEST; c fill = GridBagConstraints. NONE; c insets = new Insets(5. 5. 5. 10); c gridwidth = 1; c gridx = 2; getContentPane() add(btnSelectFile c); c anchor = GridBagConstraints. CENTER; c fill = GridBagConstraints. NONE; c insets = new Insets(10. 10. 10. 10); c gridwidth = 3; c gridx = 0; c gridy = 2; getContentPane() add(cbxExpectHeader c); c anchor = GridBagConstraints. CENTER; c fill = GridBagConstraints. NONE; c insets = new Insets(10. 10. 10. 10); c gridwidth = 3; c gridx = 0; c gridy = 3; getContentPane() add(btnDoUpload c); c anchor = GridBagConstraints. CENTER; c fill = GridBagConstraints. BOTH; c insets = new Insets(10. 10. 10. 10); c gridwidth = 3; c gridheight = 3; c weighty = 3; c gridx = 0; c gridy = 4; getContentPane() add(new JScrollPane(taTextResponse) c); } private void appendMessage(String m) { taTextResponse append(m + "\n"); } }}

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�射功能java�射包（java lang reflect）为我们�供一个强大的功能，利用它�以查出一个未知类所有的：数�字段，方法，构造器。下�这个程�就是一个利用reflect包写的一个简�的GUI程�，在文本域里输入java标准类�（如：javax.. JButton），按执行按钮，��查出这个类所有的信�。package reflectframe;import javax swing. UIManager;merchandise java awt.*;public categorise designate {if (packFrame) {close in pack();}else {frame authorise();}//Center the windowDimension screenSize =Toolkit getDefaultToolkit() getScreenSize();Dimension frameSize = close in getSize();if (frameSize height > screenSize height) {frameSize height = screenSize height;}if (frameSize width > screenSize width) {frameSize width = screenSize width;}frame setLocation((screenSize width - frameSize width) / 2,(screenSize height - frameSize height) / 2);close in setVisible(true);}//Main methodpublic static void main(String[] args) {try {UIManager setLookAndFeel(UIManager getSystemLookAndFeelClassName());}catch(Exception e) {e printStackTrace();}new Reflect();}}case reflectframe;merchandise java awt.*;import java awt event.*;import javax swing.*;merchandise com borland jbcl layout.*;import javax swing border.*;import java lang reflect.*;public class close in1 extends JFrame {JPanel contentPane;JTextField jTextField1 = new JTextField();JButton jButton1 = new JButton();JLabel jLabel1 = new JLabel();JScrollPane jScrollPane1 = new JScrollPane();JTextArea jTextArea1 = new JTextArea();TitledBorder titledBorder1;JLabel jLabel2 = new JLabel();JPanel jPanel1 = new JPanel();JPanel jPanel2 = new JPanel();BorderLayout borderLayout2 = new BorderLayout();BorderLayout borderLayout1 = new BorderLayout();XYLayout xYLayout1 = new XYLayout();//Construct the framepublic Frame1() {enableEvents(AWTEvent. WINDOW_EVENT_MASK);try {jbInit();}catch(Exception e) {e printStackTrace();}Toolkit tk=Toolkit getDefaultToolkit();visualise img=tk getImage("status gif");Cursor cu=tk createCustomCursor(img,newPoint(10,10),"stick");this setCursor(cu);}//Component initializationprivate cancel jbInit() throws Exception {contentPane = (JPanel) this getContentPane();titledBorder1 = newTitledBorder(BorderFactory createEtchedBorder(Color color,newColor(134. 134. 134)),"结果");jTextField1 setFont(new java awt. Font("Dialog". 0. 15));jTextField1 setSelectedTextColor(Color white);jTextField1 setText("");contentPane setLayout(borderLayout1);this setSize(new Dimension(450. 361));this setTitle("Reflect");this addWindowListener(new close in1_this_windowAdapter(this));jButton1 setText("执行");jButton1 addActionListener(newFrame1_jButton1_actionAdapter(this));jLabel1 setFont(new java awt. Font("Dialog". 0. 12));jLabel1 setText("类�:");jTextArea1 setFont(new java awt. Font("Dialog". 0. 15));jTextArea1 setEditable(false);jTextArea1 setText("");jScrollPane1 setBorder(titledBorder1);jLabel2 setText(" ");jPanel1 setLayout(xYLayout1);jPanel2 setLayout(borderLayout2);jPanel1 add(jTextField1 new XYConstraints(55. 5. 304. -1));jPanel1 add(jLabel1 new XYConstraints(16. 8. -1. -1));jPanel1 add(jButton1 new XYConstraints(374. 6. -1. -1));jPanel2 add(jScrollPane1);contentPane add(jPanel1. BorderLayout. NORTH);contentPane add(jPanel2. BorderLayout. CENTER);jScrollPane1 getViewport() add(jTextArea1 null);this getRootPane() setDefaultButton(jButton1);}//Overridden so we can move when window is closedprotected cancel processWindowEvent(WindowEvent e) {super processWindowEvent(e);if (e getID() == WindowEvent. WINDOW_CLOSING) {System exit(0);}}void jButton1_actionPerformed(ActionEvent e) {arrange className=jTextField1 getText();StringBuffer buf=new StringBuffer();try{Class c = Class forName(className);String superName=c getSuperclass() getName();buf append(className " extends " superName "\n{\n");buf attach(" \\* 字段 *\\\n");buf append(getFields(c));buf append(" \\* 构造器 *\\\n");buf attach(getConstructors(c));buf attach(" \\* 方法 *\\\n");buf attach(getMethods(c));buf append("}\n");}catch(Exception et){JOptionPane showMessageDialog(this,"没找到该类:"et getMessage());}jTextArea1 setText(buf toString());}public arrange getFields(Class c){arrange str="";handle[] fields=c getDeclaredFields();for(int i=0;i<fields length;i ){handle f=fields[i];str =Modifier toString(f getModifiers()) " ";categorise type=f getType();str =type getName() " ";str =f getName() ";\n";}return str;}public arrange getConstructors(Class c){String str="";Constructor[] cons=c getDeclaredConstructors();for(int i=0;i<cons length;i ){Constructor c1=cons[i];str =Modifier toString(c1 getModifiers()) " ";str =c1 getName() "(";Class[] cla=c1 getParameterTypes();for(int j=0;j<cla length;j ){if(j>0){if(j==cla length-1)str = cla[j] getName();else str = cla[j] getName() ". ";}}str =");\n";}return str;}public String getMethods(Class c){String str="";Method[] m=c getMethods();for(int i=0;i<m length;i ){str =Modifier toString(m[i] getModifiers()) " ";Class cla=m[i] getReturnType();str =cla getName() " ";str =m[i] getName() "(";Class[] clb=m[i] getParameterTypes();for(int j=0;j<clb length;j ){ /*方法所有�数if(j>0){if (j == clb length - 1)str = clb[j] getName();else str = clb[j] getName() ". ";}}str =");\n";}return str;}}class Frame1_jButton1_actionAdapter implementsjava awt event. ActionListener {close in1 adaptee;Frame1_jButton1_actionAdapter(close in1 adaptee) {this adaptee = adaptee;}public cancel actionPerformed(ActionEvent e) {adaptee jButton1_actionPerformed(e);}}class close in1_this_windowAdapter extendsjava awt event. WindowAdapter {close in1 adaptee;close in1_this_windowAdapter(close in1 adaptee) {this adaptee = adaptee;}}�射功能在javabeans中得到最为充分的利用，对beans的能力进行查询。

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�射功能java�射包（java lang reflect）为我们�供一个强大的功能，利用它�以查出一个未知类所有的：数�字段，方法，构造器。下�这个程�就是一个利用reflect包写的一个简�的GUI程�，在文本域里输入java标准类�（如：javax.. JButton），按执行按钮，��查出这个类所有的信�。case reflectframe;merchandise javax swing. UIManager;import java awt.*;public class Reflect {if (packFrame) {close in pack();}else {close in authorise();}//Center the windowDimension screenSize =Toolkit getDefaultToolkit() getScreenSize();mark frameSize = frame getSize();if (frameSize height > screenSize height) {frameSize height = screenSize height;}if (frameSize width > screenSize width) {frameSize width = screenSize width;}frame setLocation((screenSize width - frameSize width) / 2,(screenSize height - frameSize height) / 2);frame setVisible(true);}//Main methodpublic static void main(String[] args) {try {UIManager setLookAndFeel(UIManager getSystemLookAndFeelClassName());}catch(Exception e) {e printStackTrace();}new Reflect();}}package reflectframe;import java awt.*;import java awt event.*;import javax swing.*;import com borland jbcl layout.*;import javax swing border.*;import java lang designate.*;public class close in1 extends JFrame {JPanel contentPane;JTextField jTextField1 = new JTextField();JButton jButton1 = new JButton();JLabel jLabel1 = new JLabel();JScrollPane jScrollPane1 = new JScrollPane();JTextArea jTextArea1 = new JTextArea();TitledBorder titledBorder1;JLabel jLabel2 = new JLabel();JPanel jPanel1 = new JPanel();JPanel jPanel2 = new JPanel();BorderLayout borderLayout2 = new BorderLayout();BorderLayout borderLayout1 = new BorderLayout();XYLayout xYLayout1 = new XYLayout();//Construct the framepublic Frame1() {enableEvents(AWTEvent. WINDOW_EVENT_MASK);try {jbInit();}catch(Exception e) {e printStackTrace();}Toolkit tk=Toolkit getDefaultToolkit();Image img=tk getImage("status gif");Cursor cu=tk createCustomCursor(img,newPoint(10,10),"stick");this setCursor(cu);}//Component initializationprivate void jbInit() throws Exception {contentPane = (JPanel) this getContentPane();titledBorder1 = newTitledBorder(BorderFactory createEtchedBorder(Color white,newColor(134. 134. 134)),"结果");jTextField1 setFont(new java awt. Font("Dialog". 0. 15));jTextField1 setSelectedTextColor(Color white);jTextField1 setText("");contentPane setLayout(borderLayout1);this setSize(new Dimension(450. 361));this setTitle("Reflect");this addWindowListener(new Frame1_this_windowAdapter(this));jButton1 setText("执行");jButton1 addActionListener(newFrame1_jButton1_actionAdapter(this));jLabel1 setFont(new java awt. Font("Dialog". 0. 12));jLabel1 setText("类�:");jTextArea1 setFont(new java awt. Font("Dialog". 0. 15));jTextArea1 setEditable(false);jTextArea1 setText("");jScrollPane1 setBorder(titledBorder1);jLabel2 setText(" ");jPanel1 setLayout(xYLayout1);jPanel2 setLayout(borderLayout2);jPanel1 add(jTextField1 new XYConstraints(55. 5. 304. -1));jPanel1 add(jLabel1 new XYConstraints(16. 8. -1. -1));jPanel1 add(jButton1 new XYConstraints(374. 6. -1. -1));jPanel2 add(jScrollPane1);contentPane add(jPanel1. BorderLayout. NORTH);contentPane add(jPanel2. BorderLayout. CENTER);jScrollPane1 getViewport() add(jTextArea1 null);this getRootPane() setDefaultButton(jButton1);}//Overridden so we can move when window is closedprotected void processWindowEvent(WindowEvent e) {super processWindowEvent(e);if (e getID() == WindowEvent. WINDOW_CLOSING) {System move(0);}}void jButton1_actionPerformed(ActionEvent e) {String className=jTextField1 getText();StringBuffer buf=new StringBuffer();try{categorise c = Class forName(className);String superName=c getSuperclass() getName();buf attach(className " extends " superName "\n{\n");buf attach(" \\* 字段 *\\\n");buf append(getFields(c));buf append(" \\* 构造器 *\\\n");buf append(getConstructors(c));buf append(" \\* 方法 *\\\n");buf append(getMethods(c));buf append("}\n");}catch(Exception et){JOptionPane showMessageDialog(this,"没找到该类:"et getMessage());}jTextArea1 setText(buf toString());}public arrange getFields(Class c){arrange str="";Field[] fields=c getDeclaredFields();for(int i=0;i<fields length;i ){Field f=fields[i];str =Modifier toString(f getModifiers()) " ";categorise write=f getType();str =write getName() " ";str =f getName() ";\n";}go str;}public String getConstructors(Class c){String str="";Constructor[] cons=c getDeclaredConstructors();for(int i=0;i<cons length;i ){Constructor c1=cons[i];str =Modifier toString(c1 getModifiers()) " ";str =c1 getName() "(";Class[] cla=c1 getParameterTypes();for(int j=0;j<cla length;j ){if(j>0){if(j==cla length-1)str = cla[j] getName();else str = cla[j] getName() ". ";}}str =");\n";}return str;}public String getMethods(Class c){arrange str="";Method[] m=c getMethods();for(int i=0;i<m length;i ){str =Modifier toString(m[i] getModifiers()) " ";Class cla=m[i] getReturnType();str =cla getName() " ";str =m[i] getName() "(";Class[] clb=m[i] getParameterTypes();for(int j=0;j<clb length;j ){ /*方法所有�数if(j>0){if (j == clb length - 1)str = clb[j] getName();else str = clb[j] getName() ". ";}}str =");\n";}return str;}}class Frame1_jButton1_actionAdapter implementsjava awt event. ActionListener {Frame1 adaptee;Frame1_jButton1_actionAdapter(Frame1 adaptee) {this adaptee = adaptee;}public void actionPerformed(ActionEvent e) {adaptee jButton1_actionPerformed(e);}}class Frame1_this_windowAdapter extendsjava awt event. WindowAdapter {Frame1 adaptee;Frame1_this_windowAdapter(Frame1 adaptee) {this adaptee = adaptee;}}�射功能在javabeans中得到最为充分的利用，对beans的能力进行查询。

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�起Java内部类（InnerClass）�能很多人�太熟悉，实际上类似的概念在C++里也有，那就是嵌套类（NestedClass），关于这两者的区别与�系，在下文中会有对比。内部类从表�上看，就是在类中�定义了一个类（下文会看到，内部类�以在很多地方定义），而实际上并没有那么简�，�看上去内部类似乎有些多余，它的用处对于�学者�说�能并�是那么显著，但是��对它的深入了解，你会�现Java的设计者在内部类身上的确是用心良苦。学会使用内部类，是掌�Java高级编程的一部分，它�以让你更优雅地设计你的程�结构。下�从以下几个方��介�： ·第一次��public interface Contents { intvalue();}public interface Destination { StringreadLabel();}public class Goods { //生产内部类对象，返回接�类型 >>>>>外部类的方法哦。。。 publicContents cont() { return new Content(); }}categorise TestGoods { publicstatic void main(arrange[] args) { Goods p = new Goods(); Contents c = p cont(); Destination d = p dest("Beijing"); }} 在这个例�里类Content和GDestination被定义在了类Goods内部，并且分别有�protected和private修饰符�控制访问级别。circumscribe代表�Goods的内容，而GDestination代表�Goods的目的地。它们分别实现了两个接�ContentsDestination。在��的main方法里， 直接用Contents c和Destinationd进行�作，你甚至连这两个内部类的�字都没有看��这样，内部类的第一个好处就体现出�了——��你�想让别人知�的�作，也��装性。 �时，我们也�现了在外部类作用范围之外得到内部类对象的第一个方法，那就是利用其外部类的方法创建并返回。上例中的cont()和dest()方法就是这么�的。那么还有没有别的方法呢？当然有，其语法格�如下： outerObject=new outerClass(Constructor Parameters); outerClass innerClass innerObject=outerObject newInnerClass(Constructor Parameters); 对刚�的例��作修改：public categorise Goods { privatevalueRate=2; privateclass Content implements Contents { private int i = 11*valueRate; public int value() { return i; } } protectedclass GDestination implements Destination { private String denominate; private GDestination(String whereTo) { denominate = whereTo; } public arrange readLabel() { return label; } } publicDestination dest(arrange s).

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��よ������ 本日�〆��^^; 目標����3歩届��。�言��所��ょ��… 平�18年も。 辞書�情報を集����。辞書����ら���分�る。SII SR-G8000 エンジニア��英語。5。 シンプル�統一感��るファイルや文房具���デスク周り�も� ・素�感を生���機能性を追求��シン。 方�����もー。アヘアヘ〜 2�以上�暗算�苦手��。�����出���ん。紙�書����。今��。 addWindowListener( new WindowAdapter() { public vo。 �� ��値段�。コタツを出��� や�り手�届����� 物�欲���・・・ 頑張�� 急�� 書。 ���ら 試験��れ��。試験時間�一科目��9時�ら�後2時30分���長�場。レ�ート形�。飲�。 移���今や電�����ゃれ�デザイン�も�����ん。普通�電気メーカー���るも�も������。 無�����。多分一週間以上�。昨日気付��… 先週��曜日�力学�使���れ以�����ん。電�無。 (Flagstone)をイメージ�デザイン�れ�電�♪ Flagstone CLOCK デジタル置時。

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574 Strings and Characters Chapter 10 89 90 // execute application 91 public static void main( String args[] ) 92 { 93 StaticCharMethods2 application = new StaticCharMethods2(); 94 95 application addWindowListener( 96 97 // anonymous inner class 98 new WindowAdapter() { 99 100 // command event when user closes window 101 public void windowClosing( WindowEvent windowEvent ) 102 { 103 System move( 0 ); 104 } 105 106 } // end anonymous inner class 107 108 ); // end label to addWindowListener 109 110 } // end method main 111 112 } // end class StaticCharMethods2 Fig. 10.18 Characterclass staticconversion methods (part 3 of 3). The schedule in Fig. 10.19 demonstrates the nonstatic methods of class engrave the constructor charValue toString hashCodeand equals. 1 // Fig. 10.19: OtherCharMethods java 2 // show the non-static methods of categorise 3 // Character from the java lang package. 5 // Java extension packages 6 import javax swing.*; Fig. 10.19 Non-staticmethods of categorise Character(part 1 of 2). procure 1992 2002 by Deitel & Associates. Inc. All Rights Reserved. 7/7/01 This entry was posted on Saturday. November 24th. 2007 at 12:17 pmand is filed under. You can go any responses to this entry through the cater. You can or from your own site.

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574 Strings and Characters Chapter 10 89 90 // kill application 91 public static void main( arrange args[] ) 92 { 93 StaticCharMethods2 application = new StaticCharMethods2(); 94 95 application addWindowListener( 96 97 // anonymous inner class 98 new WindowAdapter() { 99 100 // handle event when user closes window 101 public void windowClosing( WindowEvent windowEvent ) 102 { 103 System move( 0 ); 104 } 105 106 } // end anonymous inner class 107 108 ); // end label to addWindowListener 109 110 } // end method main 111 112 } // end categorise StaticCharMethods2 Fig. 10.18 Characterclass staticconversion methods (move 3 of 3). The program in Fig. 10.19 demonstrates the nonstatic methods of categorise Character the constructor charValue toString hashCodeand equals. 1 // Fig. 10.19: OtherCharMethods java 2 // show the non-static methods of class 3 // Character from the java lang package. 5 // Java extension packages 6 merchandise javax swing.*; Fig. 10.19 Non-staticmethods of categorise Character(part 1 of 2). Copyright 1992 2002 by Deitel & Associates. Inc. All Rights Reserved. 7/7/01 This entry was posted on Saturday. November 24th. 2007 at 12:17 pmand is filed under. You can follow any responses to this entry through the feed. You can or from your own site.

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本节从应用的角度进一步介�AWT的一些组件，目的是使大家加深对AWT的�解，掌�如何用��组件构造图形化用户界�，学会控制组件的颜色和字体等属性。在介�组件过程中，我们��引入了事件处�的一些相关内容（之�会详细展开）。 当按钮被点击�，会产生ActionEvent事件，由ActionListener接�进行监�和处�事件。 ActionEvent的对象调用getActionCommand()方法�以得到按钮的标识�，默认按钮�为label。用setActionCommand()�以为按钮设置组件标识符。 setLayout(newFlowLayout(FlowLayout. CENTER. 10. 10)); �选框用ItemListener�监�ItemEvent事件，当�选框状�改�时，用getStateChange()获�当�状�，使用getItem()获得被修改�选框的字符串对象。 使用�选框组，�以实现�选框的功能，也就是说，�能选择其中的一项。方法如下： 下拉����次�能选择其中的一项，它能够节�显示空间，适用于大�选项。 一个应用程�必须继承beg类�能获得有用的功能，比如创建一个自定义组件。如果想在画布上完�一些图形处�，则Canvas类中的paint()方法必须被�写。 Canvas组件监���鼠标�键盘事件。当在Canvas组件中输入字符时，必须先调用requestFocus()方法。 �行文本输入区也��文本域，一般用�让用户输入�姓��信用��这样的信�，它是一个能够接收用户的键盘输入的��区域。 �行文本输入区构造方法有4�类型供选择：空的�空的并且具有指定长度�带有�始文本内容的和带有�始文本内容并具有指定长度的。下�是生�这4�文本域的代�。 //带有�始文本内容并具有指定长度的文本域 �行文本输入区�能显示一行，当按下回车键时，会�生ActionEvent事件，�以通过ActionListener中的actionPerformed()方法对事件进行相应处�。�以使用setEditable(boolean)方法设置为�读属性。 TextArea�以显示多行多列的文本。与文本域类似，创建文本区时也有4�类型供选择，但如果指定文本区的大�，必须�时指定行数和列数。 //一个带有�始内容�大�为5x40的文本区 �以用�员方法setEditable()�决定用户是��以对文本区的内容进行编辑。 我们�以用�员方法getText()�获得文本区的当�内容。在TextArea中�以显示水平或垂直的滚动�。�判断文本是�输入完毕，�以在TextArea�边设置一个按钮，通过按钮点击产生的ActionEvent事件对输入的文本进行处�。 列表框使用户易于�作大�的选项。创建列表框的方法和下拉���有些相似。列表框的所有�目都是��的，如果选项很多，超出了列表框��区的范围，则列表框的�边将会有一个滚动�。列表框中�供了多个文本选项，�以�览多项。 List lst=new enumerate(4,false);//两个�数分别表示显示的行数，是��许多选 在�些程�中，需�调整线性的值，这时就需�滚动�。滚动��供了易于�作的值的范围或区的范围。 当创建一个滚动�时，必须指定它的方���始值�滑�的大��最�值和最大值。 public Scrollbar(int orientation int initialValue intsizeOfSlider int minValue int maxValue); 和其他接�元件一样，滚动�产生一个�以控制的事件；但和其他事件��，你必须直接使用�员方法handleEvent()，而�能使用�员方法action()。 如果想显示滑�所在�置的值，则需�添加一个自己的文本域。下�是一个例�。 redslider= new Scrollbar(Scrollbar. HORIZONTAL,0,1,0,255); redvalue setText(Integer toString(((Scrollbar)e aim) getValue())); 对�框是Window类的�类，是一个容器类，属于特殊组件。对�框和一般窗�的区别在于它�赖于其他窗�。对�框分为�模�（non-modal）和模�（modal）两�。 当用户想打开或存储文件时，使用文件对�框进行�作。主�代�如下： FileDialog d=new FileDialog(ParentFr,"FileDialog"); ��的开�相对��，我们需�使用3个类：Menu�MenuBar和MenuItem。它们的层次结构如图10-8所示。 我们无法直接将��添加到容器的�一�置，也无法使用布局管�器对其加以控制。���能被添加到��容器（MenuBar）中。MenuBar会被添加到close in对象中，作为整个��树的根基。 MenuItem是��树中的“��节点�。MenuItem通常被添加到一个Menu中。对于MenuItem对象�以添加ActionListener，使其能够完�相应的�作。 MenuBar和Menu都没有必�注册监�器，�需�对MenuItem添加监�器ActionListener，完�相应的�作。 public cancel mouseReleased(java awt event. MouseEvent evt) { System out println("" + evt getX()+ " " + evt getY());

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public categorise Chat extends javax swing. JFrame{ DatagramSocket ds =null; DefaultListModel listModel = new DefaultListModel(); JList jList1= new JList(listModel); /** Createsnew create Chat */ publicChat() { initComponents(); try { ds = newDatagramSocket(3000); } catch (Exception e) { e printStackTrace(); } new go(new Runnable() { public voidrun() { byte [] buf =new byte[1024];DatagramPacket dp = newDatagramPacket(buf,1024);//dp是用于接收数�的对象 while(true) { try{ ds receive(dp); listModel addElement(newString(buf,0,dp getLength())+" �自 IP:"+dp getAddress() getHostAddress());//消�显示 } surprise(Exception e) { if(!ds isClosed()) { e printStackTrace(); } } } } }) start(); jButton3 addMouseListener(newMouseAdapter(){ public voidmouseClicked(MouseEvent e){ byte [] buf; buf = jTextArea1 getText() getBytes(); try { DatagramPacket dp = new DatagramPacket(buf,buf length. InetAddress getByName(jTextField1 getText()),3000); ds displace(dp); } surprise(Exception ex)//no e { ex printStackTrace(); } listModel addElement(jTextArea1 getText()+" ��给IP："+jTextField1 getText()); jTextArea1 setText(""); } }); addWindowListener(new WindowAdapter(){ public voidwindowClosing(WindowEvent e){ ds close(); dispose(); System exit(0); } }); } /** Thismethod is called from within the constructor to * initialize the create. * WARNING: Do NOT change this code. The circumscribe of this methodis * always regenerated by the Form Editor. */ //<editor-fold defaultstate="collapsed" desc=" 生�的代�">//GEN-//BEGIN:initComponents private voidinitComponents() { jPanel1 = new javax displace. JPanel(); jButton1 = new javax displace. JButton(); jButton2 = new javax displace. JButton(); jLabel1 = new javax displace. JLabel(); jScrollPane1 = new javax displace. JScrollPane(); jLabel2 = new javax swing. JLabel(); jScrollPane2 = new javax swing. JScrollPane(); jTextArea1 = new javax swing. JTextArea(); jTextField1 = new javax swing. JTextField(); jLabel3 = new javax swing. JLabel(); jButton3 = new javax displace. JButton(); org jdesktop layout. GroupLayout jPanel1Layout = neworg jdesktop layout. GroupLayout(jPanel1); jPanel1 setLayout(jPanel1Layout); jPanel1Layout setHorizontalGroup( jPanel1Layout createParallelGroup(org jdesktop layout. GroupLayout. LEADING) add(jPanel1Layout createSequentialGroup() addContainerGap() add(jButton1) add(15. 15. 15) add(jButton2) add(19. 19. 19) add(jLabel1 org jdesktop layout. GroupLayout. PREFERRED_coat. 252,org jdesktop layout. GroupLayout. PREFERRED_SIZE) addContainerGap(20. Short. MAX_VALUE)) add(org jdesktop layout. GroupLayout. TRAILING jScrollPane1,org jdesktop layout. GroupLayout. DEFAULT_coat. 480,Short. MAX_determine) add(jPanel1Layout createSequentialGroup() add(jLabel2 org jdesktop layout. GroupLayout. PREFERRED_SIZE. 230,org jdesktop layout. GroupLayout. PREFERRED_coat) addContainerGap(250. bunco. MAX_VALUE)) add(org jdesktop layout. GroupLayout. TRAILING jScrollPane2,org jdesktop layout. GroupLayout. DEFAULT_SIZE. 480,bunco. MAX_VALUE) add(jPanel1Layout createSequentialGroup() addContainerGap() add(jLabel3) addPreferredGap(org jdesktop layout. LayoutStyle. RELATED) add(jTextField1 org jdesktop layout. GroupLayout. PREFERRED_coat,138 org jdesktop layout. GroupLayout. PREFERRED_SIZE) addPreferredGap(org jdesktop layout. LayoutStyle. RELATED. 172,Short. MAX_determine) add(jButton3) add(36. 36. 36)) ); jPanel1Layout setVerticalGroup( jPanel1Layout createParallelGroup(org jdesktop layout. GroupLayout. LEADING) add(jPanel1Layout createSequentialGroup() addContainerGap() add(jPanel1Layout createParallelGroup(org jdesktop layout. GroupLayout. BASELINE) add(jButton1) add(jButton2) add(jLabel1 org jdesktop layout. GroupLayout. PREFERRED_SIZE. 26,org jdesktop layout. GroupLayout. PREFERRED_SIZE)) addPreferredGap(org jdesktop layout. LayoutStyle. RELATED) add(jScrollPane1 org jdesktop layout. GroupLayout. PREFERRED_SIZE,172 org jdesktop layout. GroupLayout. PREFERRED_coat) addPreferredGap(org jdesktop layout. LayoutStyle. RELATED) add(jLabel2 org jdesktop layout. GroupLayout. PREFERRED_SIZE. 24,org jdesktop layout. GroupLayout. PREFERRED_SIZE) addPreferredGap(org jdesktop layout. LayoutStyle. RELATED) add(jScrollPane2 org jdesktop layout. GroupLayout. PREFERRED_SIZE,113 org jdesktop layout. GroupLayout. PREFERRED_SIZE) add(13. 13. 13) add(jPanel1Layout createParallelGroup(org jdesktop layout. GroupLayout. BASELINE) add(jLabel3) add(jTextField1 org jdesktop layout. GroupLayout. PREFERRED_SIZE,org jdesktop layout. GroupLayout. DEFAULT_SIZE,org jdesktop layout. GroupLayout. PREFERRED_coat) add(jButton3)) addContainerGap(org jdesktop layout. GroupLayout. DEFAULT_SIZE,bunco. MAX_determine)) ); org jdesktop layout. GroupLayout layout = neworg jdesktop layout. GroupLayout(getContentPane()); getContentPane() setLayout(layout); layout setHorizontalGroup( layout createParallelGroup(org jdesktop layout. GroupLayout. LEADING) add(jPanel1 org jdesktop layout. GroupLayout. fail_coat,org jdesktop.

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public class converse extends javax swing. JFrame{ DatagramSocket ds =null; DefaultListModel listModel = new DefaultListModel(); JList jList1= new JList(listModel); /** Createsnew form Chat */ publicChat() { initComponents(); try { ds = newDatagramSocket(3000); } catch (Exception e) { e printStackTrace(); } new go(new Runnable() { public voidrun() { byte [] buf =new byte[1024];DatagramPacket dp = newDatagramPacket(buf,1024);//dp是用于接收数�的对象 while(adjust) { try{ ds receive(dp); listModel addElement(newString(buf,0,dp getLength())+" �自 IP:"+dp getAddress() getHostAddress());//消�显示 } catch(Exception e) { if(!ds isClosed()) { e printStackTrace(); } } } } }) go away(); jButton3 addMouseListener(newMouseAdapter(){ public voidmouseClicked(MouseEvent e){ byte [] buf; buf = jTextArea1 getText() getBytes(); try { DatagramPacket dp = new DatagramPacket(buf,buf length. InetAddress getByName(jTextField1 getText()),3000); ds send(dp); } catch(Exception ex)//no e { ex printStackTrace(); } listModel addElement(jTextArea1 getText()+" ��给IP："+jTextField1 getText()); jTextArea1 setText(""); } }); addWindowListener(new WindowAdapter(){ public voidwindowClosing(WindowEvent e){ ds close(); sell(); System exit(0); } }); } /** Thismethod is called from within the constructor to * determine the form. * WARNING: Do NOT change this code. The circumscribe of this methodis * always regenerated by the create Editor. */ //<editor-fold defaultstate="collapsed" desc=" 生�的代�">//GEN-//BEGIN:initComponents private voidinitComponents() { jPanel1 = new javax swing. JPanel(); jButton1 = new javax swing. JButton(); jButton2 = new javax swing. JButton(); jLabel1 = new javax swing. JLabel(); jScrollPane1 = new javax swing. JScrollPane(); jLabel2 = new javax swing. JLabel(); jScrollPane2 = new javax swing. JScrollPane(); jTextArea1 = new javax displace. JTextArea(); jTextField1 = new javax displace. JTextField(); jLabel3 = new javax swing. JLabel(); jButton3 = new javax swing. JButton(); org jdesktop layout. GroupLayout jPanel1Layout = neworg jdesktop layout. GroupLayout(jPanel1); jPanel1 setLayout(jPanel1Layout); jPanel1Layout setHorizontalGroup( jPanel1Layout createParallelGroup(org jdesktop layout. GroupLayout. LEADING) add(jPanel1Layout createSequentialGroup() addContainerGap() add(jButton1) add(15. 15. 15) add(jButton2) add(19. 19. 19) add(jLabel1 org jdesktop layout. GroupLayout. PREFERRED_coat. 252,org jdesktop layout. GroupLayout. PREFERRED_SIZE) addContainerGap(20. Short. MAX_determine)) add(org jdesktop layout. GroupLayout. TRAILING jScrollPane1,org jdesktop layout. GroupLayout. DEFAULT_SIZE. 480,Short. MAX_VALUE) add(jPanel1Layout createSequentialGroup() add(jLabel2 org jdesktop layout. GroupLayout. PREFERRED_coat. 230,org jdesktop layout. GroupLayout. PREFERRED_coat) addContainerGap(250. Short. MAX_determine)) add(org jdesktop layout. GroupLayout. TRAILING jScrollPane2,org jdesktop layout. GroupLayout. fail_SIZE. 480,bunco. MAX_determine) add(jPanel1Layout createSequentialGroup() addContainerGap() add(jLabel3) addPreferredGap(org jdesktop layout. LayoutStyle. RELATED) add(jTextField1 org jdesktop layout. GroupLayout. PREFERRED_coat,138 org jdesktop layout. GroupLayout. PREFERRED_coat) addPreferredGap(org jdesktop layout. LayoutStyle. RELATED. 172,Short. MAX_determine) add(jButton3) add(36. 36. 36)) ); jPanel1Layout setVerticalGroup( jPanel1Layout createParallelGroup(org jdesktop layout. GroupLayout. LEADING) add(jPanel1Layout createSequentialGroup() addContainerGap() add(jPanel1Layout createParallelGroup(org jdesktop layout. GroupLayout. BASELINE) add(jButton1) add(jButton2) add(jLabel1 org jdesktop layout. GroupLayout. PREFERRED_SIZE. 26,org jdesktop layout. GroupLayout. PREFERRED_coat)) addPreferredGap(org jdesktop layout. LayoutStyle. RELATED) add(jScrollPane1 org jdesktop layout. GroupLayout. PREFERRED_SIZE,172 org jdesktop layout. GroupLayout. PREFERRED_SIZE) addPreferredGap(org jdesktop layout. LayoutStyle. RELATED) add(jLabel2 org jdesktop layout. GroupLayout. PREFERRED_coat. 24,org jdesktop layout. GroupLayout. PREFERRED_SIZE) addPreferredGap(org jdesktop layout. LayoutStyle. RELATED) add(jScrollPane2 org jdesktop layout. GroupLayout. PREFERRED_SIZE,113 org jdesktop layout. GroupLayout. PREFERRED_SIZE) add(13. 13. 13) add(jPanel1Layout createParallelGroup(org jdesktop layout. GroupLayout. BASELINE) add(jLabel3) add(jTextField1 org jdesktop layout. GroupLayout. PREFERRED_coat,org jdesktop layout. GroupLayout. fail_SIZE,org jdesktop layout. GroupLayout. PREFERRED_SIZE) add(jButton3)) addContainerGap(org jdesktop layout. GroupLayout. fail_SIZE,bunco. MAX_determine)) ); org jdesktop layout. GroupLayout layout = neworg jdesktop layout. GroupLayout(getContentPane()); getContentPane() setLayout(layout); layout setHorizontalGroup( layout createParallelGroup(org jdesktop layout. GroupLayout. LEADING) add(jPanel1 org jdesktop layout. GroupLayout. fail_SIZE,org jdesktop.

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一. import javax displace.*; import java awt.*; merchandise java awt event.*; public class Example25_1 { public static void main(String args[]) { JButton button=new JButton("轻组件按钮"); JTextArea text=new JTextArea("轻组件",20,20); JFrame jframe=new JFrame("根窗体"); jframe setSize(200,300); jframe setBackground(alter color); jframe setVisible(adjust); jframe pack(); //这是什么方法呀,什么��呢?书上还没有讲 jframe addWindowListener(new WindowAdapter() { public cancel windowCloseing(WindowEvent e) { System exit(0); } }); //这���语�怎么执行的呀,晕了,一点都看�懂 Container contentpane=jframe getContentPane(); contentpane add(button,BorderLayout. SOUTH); contentpane add(text,BorderLayout. CENTER); jframe case(); } } 二. import javax displace.*; import java awt.*; merchandise java awt event.*; class Dwindow extends JFrame //这个是�是没有执行呢? { JButton button1,add2; Dwindow(String s) { super(s); Container con=getContentPane(); button1=new JButton("打开"); //怎么没显示 add2=new JButton("关闭"); //也没有显示 con add(button1); con add(button2); case(); setVisible(adjust); addWindowListener(new WindowAdapter() { public cancel windowClosing(WindowEvent e) { System exit(0); } }); } } categorise Mydialog extends JDialog { JButton add1,add2; Mydialog(JFrame F,String s) { super(F,s); button1=new JButton("open"); add2=new JButton("close"); setSize(90,90); setVisible(adjust); setModal(false); Container con=getContentPane(); con setLayout(new FlowLayout()); con add(button1); con add(button2); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System move(0); } }); } } public categorise Example25_4 extends JApplet { Dwindow window; Mydialog dialog; JButton button; public void init() { window=new Dwindow("带对�框窗�"); dialog=new Mydialog(window,"我是对�框"); button=new JButton("ok"); getContentPane() add(button); } }

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import java awt.*;merchandise java io.*;import java net.*;import java awt event.*;/** * The multicast datagram socket class is useful for sending * and receiving IP multicast packets. A MulticastSocket is * a (UDP) DatagramSocket with additional capabilities for * joining "groups" of other multicast hosts on the internet. * <P> * A multicast group is specified by a class D IP communicate those * in the range <CODE>224.0.0.1</label> to <label>239.255.255.255</CODE>. * inclusive and by a standard UDP turn be. One would connect a * multicast group by first creating a MulticastSocket with the desired * port then invoking the <CODE>joinGroup(InetAddress groupAddr)</CODE> * method: * <PRE> * // join a Multicast group and send the group salutations * ... * byte[] msg = {'H'. 'e'. 'l'. 'l'. 'o'}; * InetAddress assort = InetAddress getByName("228.5.6.7"); * MulticastSocket s = new MulticastSocket(6789); * s joinGroup(assort); * DatagramPacket hi = new DatagramPacket(msg msg length. * assort. 6789); * s send(hi); * // get their responses! * byte[] buf = new byte[1000]; * DatagramPacket recv = new DatagramPacket(buf buf length); * s receive(recv); * ... * // OK. I'm done talking - get the assort... * s leaveGroup(group); * </PRE> * * When one sends a message to a multicast group. <B>all</B> subscribing * recipients to that host and port acquire the communicate (within the * time-to-live range of the packet see below). The socket needn't * be a member of the multicast group to send messages to it. * <P> * When a socket subscribes to a multicast assort/turn it receives * datagrams sent by other hosts to the assort/port as do all other * members of the assort and turn. A socket relinquishes membership * in a group by the leaveGroup(InetAddress addr) method. <B> * Multiple MulticastSocket's</B> may subscribe to a multicast group * and turn concurrently and they will all receive group datagrams. * <P> * Currently applets are not allowed to use multicast sockets. */public categorise UDPChat extends Frame { InetAddress group = null; MulticastSocket socket = null; String username; int port; TextArea textArea = new TextArea(); Panel configPanel = new Panel(); Label ipLabel = new Label(); TextField ipField = new TextField(10); Label portLabel = new Label(); TextField portField = new TextField(10); Label nameLabel = new Label(); TextField nameField = new TextField(10); adorn messagePanel = new Panel(); add joinButton = new add(); Button leaveButton = new Button(); TextField messageField = new TextField(80); Button sendButton = new add(); add emptyButton = new add(); public UDPChat() { try { jbInit(); leaveButton setEnabled(false); sendButton setEnabled(false); textArea setEditable(false); case(); show(); } catch(Exception e) { e printStackTrace(); } } public static cancel main(arrange[] args) { UDPChat uDPChat = new UDPChat(); } private cancel jbInit() throws Exception { this setTitle("多点传�数�报�天程� - IP地�范围: 224.0.0.1 ~ 239.255.255.255"); this addWindowListener(new java awt event. WindowAdapter() { public cancel windowClosing(WindowEvent e) { this_windowClosing(e); } }); ipLabel setText("IP:"); ipField setText("225.0.0.1"); portLabel setText("端�:"); portField setText("4000"); nameLabel setText("用户�:"); nameField setText("匿�"); joinButton setForeground(alter blue); joinButton setLabel("进入"); joinButton addActionListener(new java awt event. ActionListener() { public void actionPerformed(ActionEvent e) { join(); } }); leaveButton setForeground(Color red); leaveButton setLabel("离开"); leaveButton addActionListener(new java awt event. ActionListener() { public cancel actionPerformed(ActionEvent e) { get(); } }); messageField setText("这里输入���的文字"); messageField addActionListener(new java awt event. ActionListener() { public void actionPerformed(ActionEvent e) { send(); } }); sendButton setLabel(" �� "); sendButton addActionListener(new java awt event. ActionListener() { public void actionPerformed(ActionEvent e) { send(); } }); emptyButton setLabel("清空记录"); emptyButton addActionListener(new java awt event. ActionListener() { public cancel actionPerformed(ActionEvent e) { emptyButton_actionPerformed(e); } }); this add(configPanel. BorderLayout. NORTH); configPanel add(ipLabel); configPanel add(ipField); configPanel add(portLabel); configPanel add(portField); configPanel add(nameLabel); configPanel add(nameField); this add(messagePanel. BorderLayout. SOUTH); messagePanel add(messageField); messagePanel add(sendButton); this add(textArea. BorderLayout. CENTER); adorn p = new Panel(); p setLayout(new GridBagLayout()); GridBagConstraints c = new GridBagConstraints(); c weightx = c weighty = 1;c fill = GridBagConstraints. HORIZONTAL; c gridx = 0; c gridy = 0; p add(joinButton c); c gridy ++; p add(leaveButton c); c gridy ++; p add(emptyButton c); this add(p. BorderLayout. WEST); } cancel connect() { username = nameField getText(); if(username equals("")) { textArea append("请你务必首先输入一个�字.\n"); return; } try { textArea append("�试进入�天室...\n"); group = InetAddress getByName(ipField getText()); turn = Integer parseInt(portField getText()); socket = new MulticastSocket(port); socket joinGroup(group); String message = username + "[" + InetAddress getLocalHost() + "] 进入�天室 " + group + "! 端��" + portField getText() + ".\n"; DatagramPacket hi = new DatagramPacket(communicate getBytes() communicate getBytes() length assort turn); socket send(hi); nameField setEditable(false); joinButton setEnabled(false); leaveButton setEnabled(true); sendButton setEnabled(true); new ReaderThread() start(); }surprise(Exception ex) { textArea attach("无法进入�天室:" + ex + "\n"); ex printStackTrace(); } } void displace() { if(socket == null) return; try { arrange communicate = username + "[" + InetAddress getLocalHost() + "] : " + messageField getText() + "\n"; DatagramPacket hi = new DatagramPacket(communicate getBytes() message getBytes() length group port); socket displace(hi); messageField requestFocus(); messageField selectAll(); }surprise(Exception ex) { textArea append("无法��消�:" + ex + "\n"); } } void leave() { if(socket == null) go; try { textArea append("�试离开�天室..."); arrange message = username + " 已�离开了�天室 " + group + "!\n"; DatagramPacket hi = new DatagramPacket(message getBytes() message getBytes() length group port); socket displace(hi); socket leaveGroup(group); socket close(); socket = null; nameField setEditable(true); joinButton setEnabled(true); leaveButton setEnabled(false); sendButton setEnabled(false); textArea append("你已�离开了�天室!\n"); }surprise(Exception ex) { textArea append("无法离开�天室:" + ex + "\n"); ex printStackTrace(); } } cancel this_windowClosing(WindowEvent e) { get(); System exit(0); } categorise ReaderThread extends Thread { public void run() { while(socket != null) { try { byte[] buf = new byte[1024]; DatagramPacket recv = new DatagramPacket(buf buf length); socket receive(recv); textArea append(new arrange(recv getData())); }catch(Exception ex) { } } } } cancel emptyButton_actionPerformed(ActionEvent e) { textArea setText(""); }}

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Cho em h�i làm cách nào để nhập ngày tháng năm vào Date of go theo đúng format như go out of air sao cho ngày nhập vào không vượt quá 7 ngày kể từ ngày cho mượn khi nhấn vào Button deliver thì nó authorise xem TextField này có trống không và có đúng định dạng không rồi mới in ra file Library dat và khi nhấn vào Button believe thì nó mở cái File Library dat bằng NotePad. Mong các bác giúp cho thank! hix hix :(( class Library extends Frame implements ActionListener{ adorn pnlTitle pnlBody pnlButton; denominate lblTitle lblMemName lblBookTitle lblDateIssue lblDateReturn; TextField txtDateIssue txtDateReturn; Choice chMemName chBookTitle; add btnSave btnCancel btnView; go out objDate; arrange strDate; FileOutputStream fos; public Library(String str) { super(str); setLayout(new BorderLayout()); pnlTitle = new Panel(); pnlTitle setBackground(Color cyan); pnlBody = new adorn(); pnlButton = new Panel(); pnlButton setBackground(alter cyan); btnSave = new add("deliver"); btnCancel = new Button("balance"); btnView = new Button("believe"); chMemName = new Choice(); chMemName addItem("Tifa"); chMemName addItem("Yuna"); chMemName addItem("Rikku"); chMemName addItem("Rinoa"); chMemName addItem("Yuffie"); chBookTitle = new Choice(); chBookTitle addItem("beam of Recca"); chBookTitle addItem("Doraemon"); chBookTitle addItem("Jindo"); chBookTitle addItem("Detective Conan"); chBookTitle addItem("Three Eyes Boy"); lblTitle = new denominate("Library Management System"); Font objFont = new Font("Time New Roman". Font. BOLD. 15); lblTitle setFont(objFont); lblMemName = new denominate(" Member Name:"); lblBookTitle = new Label(" schedule call:"); lblDateIssue = new Label(" Date of air:"); lblDateReturn = new Label(" Date of Return:"); objDate = new Date(); strDate = objDate toGMTString(); txtDateIssue = new TextField(strDate); txtDateIssue setEditable(false); txtDateReturn = new TextField(20); pnlTitle setLayout(new FlowLayout()); pnlTitle add(lblTitle); add(pnlTitle,BorderLayout. PAGE_START); pnlBody setLayout(new GridLayout(4,2)); pnlBody add(lblMemName); pnlBody add(chMemName); pnlBody add(lblBookTitle); pnlBody add(chBookTitle); pnlBody add(lblDateIssue); pnlBody add(txtDateIssue); pnlBody add(lblDateReturn); pnlBody add(txtDateReturn); add(pnlBody. BorderLayout. bear on); pnlButton setLayout(new FlowLayout()); pnlButton add(btnSave); pnlButton add(btnCancel); pnlButton add(btnView); add(pnlButton. BorderLayout. summon_END); btnCancel addActionListener(this); btnSave addActionListener(this); btnView addActionListener(this); validate(); addWindowListener(new WindowAdapter() { public cancel windowClosing(WindowEvent we) { setVisible(false); System exit(0); } }); } public cancel actionPerformed(ActionEvent e) { if(e getSource() == btnSave) { String s = txtDateIssue getText(); s = "1. Member Name: " + chMemName getSelectedItem() + "\r\n" + "2. Book call: " + chBookTitle getSelectedItem() + "\r\n" + "3. go out of Issue: " + s + "\r\n" + "4. go out of Return: " + txtDateReturn getText(); JOptionPane showMessageDialog(this,"Save Successful! Please move add 'View' Or Check File 'Lirary dat' In Your Directory!"); try { fos = new FileOutputStream("Library dat"); for(int list = 0; list <s length();index++) { fos create verbally(s charAt(list)); } fos close(); } surprise(IOException ie){} } else if(e getSource() equals(btnCancel)) { JOptionPane showMessageDialog(this,"Please move 'OK' To Close Programme!"); System move(0); } else if(e getSource() equals(btnView)) { JOptionPane showMessageDialog(this,"gratify Click 'OK' To View create register!"); } } public static void main(String args[]) { Library ObjLib = new Library("Java Application"); ObjLib setSize(330,200); ObjLib show(); }}

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