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    Swing设计JDialog | 
   
  
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     作者:未知  来源:月光软件站  加入时间:2005-2-28 月光软件站  | 
   
  
     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 {  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。");   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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