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在Java Swing编程中，程序员还可以自定义对话框，一般可以从JDialog类来继承。下面给出一个对话框类的代码： class HelpAbout extends JDialog implements ActionListener { 8月,三星与您激情奥运 手机中的战斗机 LG 手机一元抢拍 精彩手机赛事全攻略 JavaWord mainFrame; JButton okButton; javax.swing.Timer myTimer; int Counter=0; public HelpAbout(JavaWord mainFrame) { super(mainFrame,"关于本程序的说明",true); //true 代表为有模式对话框 this.mainFrame= mainFrame; JPanel contentPanel=new JPanel(); contentPanel.setLayout(new BorderLayout()); JLabel imageLabel=new JLabel(new ImageIcon(".\images\javalogo.gif")); contentPanel.add(imageLabel,BorderLayout.WEST); JPanel authorInfoPane=new JPanel(); authorInfoPane.setLayout(new GridLayout(1,1)); JTextArea aboutContent=new JTextArea("本程序是作者在学习Java2 Swing编程的一个简单的程序，\n并不作为商业目的使用。\n作者的联系方式是：\n"); aboutContent.enable(false); authorInfoPane.add(aboutContent); contentPanel.add(authorInfoPane,BorderLayout.NORTH); JPanel sysInfoPane=new JPanel(); sysInfoPane.setLayout(new GridLayout(5,1)); sysInfoPane.setBorder(BorderFactory.createLoweredBevelBorder()); contentPanel.add(sysInfoPane,BorderLayout.CENTER); JLabel userName=new JLabel("本机的用户名为："+System.getProperty("user.name")); JLabel osName=new JLabel("本机的操作系统是："+System.getProperty("os.name")); JLabel javaVersion=new JLabel("本机中所安装的Java SDK的版本号是："+System.getProperty("java.version")); JLabel totalMemory=new JLabel("本机中Java虚拟机所可能使用的总内存数："+Runtime.getRuntime().totalMemory()+"字节数" ); JLabel freeMemory=new JLabel("本机中Java虚拟机所剩余的内存数?quot;+Runtime.getRuntime().freeMemory()+"字节数" ); sysInfoPane.add(userName); sysInfoPane.add(osName); sysInfoPane.add(javaVersion); sysInfoPane.add(totalMemory); sysInfoPane.add(freeMemory); JPanel OKPane=new JPanel(); okButton=new JButton("确定(O)",new ImageIcon(".\images\ok.gif")); okButton.setMnemonic(O); //设置快捷键为"Alt + O" /*以下代码是设置案钮的Rollover图象*/ Icon rollover = new ImageIcon(".\images\exit.gif"); Icon general = new ImageIcon(".\images\ok.gif"); Icon press = new ImageIcon(".\images\help.gif"); okButton.setRolloverEnabled(true); okButton.setIcon(general); //设置离开时的图象 okButton.setRolloverIcon(rollover); //设置在按纽上时的图象 okButton.setPressedIcon(press); //设置在按下按纽时的图象 this.getRootPane().setDefaultButton(okButton); //设置该按钮为该对话框的默认的按钮?. okButton.addActionListener(this); OKPane.add(okButton); contentPanel.add("South",OKPane); setContentPane(contentPanel); // this.setResizable(false); //设置对话框为不可改变大小 myTimer=new javax.swing.Timer(1000,this); myTimer.start(); } public void actionPerformed(ActionEvent parm1) { // TODO: Add your code here if(parm1.getSource()==okButton) { dispose(); } else if(parm1.getSource()==myTimer) { Counter++; this.setTitle("当前的定时器的值为:"+Counter+"秒"); } } } 在事件响应代码中显示出该对话框，其程序代码如下： HelpAbout aboutDialog=new HelpAbout(this); aboutDialog.setSize(500,500); aboutDialog.show();
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