java常见事件响应方法实例汇总

import java.awt.*; import java.awt.event.*; import javax.swing.*;  //声明 类时，添加“implements ActionListener”实现监听的接口，如果要对多种监听方式进行监听，则用逗号间隔开 // 比如“implements ActionListener,KeyListener”  class ButtonListener extends JFrame implements ActionListener{  JButton ok, cancel,exit; //创建接受响应的组建，就是三个按钮  public ButtonListener(String title){  super(title);  this.setLayout(new FlowLayout());  ok = new JButton("确定");  cancel = new JButton("返回");  exit = new JButton("退出"); //下面三个语句 为按钮分别 注册监听器  ok.addActionListener(this);    cancel.addActionListener(this);  exit.addActionListener(this);  getContentPane().add(ok);  getContentPane().add(cancel);  getContentPane().add(exit); }  //完成 事件触发时的事件处理  public void actionPerformed(ActionEvent e){    if(e.getSource()==ok)     System.out.println("确定");    if(e.getSource()==cancel)     System.out.println("返回");    if(e.getSource()==exit)      System.exit(0);;  }   public static void main(String args[]) {    ButtonListener pd=new ButtonListener("ActionEvent Demo");    pd.setSize(250,100);   pd.setVisible(true);  } }  

import java.awt.*; import java.awt.event.*; import javax.swing.*;  class ButtonListener1 extends JFrame { //这里没有实现监听  JButton ok, cancel,exit;  public ButtonListener1(String title){   super(title);   this.setLayout(new FlowLayout());   ok = new JButton("确定");   cancel = new JButton("返回");   exit = new JButton("退出");   ok.addActionListener(new MyListener());   cancel.addActionListener(new MyListener());;   exit.addActionListener(new MyListener());;   getContentPane().add(ok);   getContentPane().add(cancel);   getContentPane().add(exit);  }   public static void main(String args[]) {    ButtonListener pd=new ButtonListener("ActionEvent Demo");    pd.setSize(250,100);   pd.setVisible(true);  } }   //监听动作事件 class MyListener implements ActionListener{   public void actionPerformed(ActionEvent e){    if(e.getActionCommand()=="确定")     System.out.println("确定");    if(e.getActionCommand()=="返回")     System.out.println("返回");    if(e.getActionCommand()=="退出")      System.exit(0);;   } }

import java.awt.BorderLayout; import java.awt.event.ActionEvent; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JOptionPane;  //此类继承AbstractAction，必须实现actionPerformed（）方法。 class AbstractEvent extends AbstractAction{   //private static final long serialVersionUID = 1L;   AbstractEvent(){   }   public void actionPerformed(ActionEvent e){     //弹出确认对话框     if (e.getActionCommand()=="open"){       JOptionPane.showMessageDialog(null, "打开");     }else if (e.getActionCommand()=="close"){       JOptionPane.showMessageDialog(null, "关闭");     }else if (e.getActionCommand()=="run"){       JOptionPane.showMessageDialog(null, "运行");     }else if (e.getActionCommand()=="stop"){       JOptionPane.showMessageDialog(null, "停止");     }   } } public class TestAbstractEvent {   private static JMenuBar menubar;   private static JFrame frame;      //指定MenuEvent的具体处理程序是AbstractEvent类完成的。   final Action MenuEvent=new AbstractEvent();   public TestAbstractEvent(){     frame=new JFrame("menu");     frame.getContentPane().setLayout(new BorderLayout());     menubar=new JMenuBar();     JMenu menuFile=new JMenu("file");          //实例化一个菜单项，并添加监听openAction，     JMenuItem menuItemopen=new JMenuItem("open");     menuItemopen.addActionListener(MenuEvent);     JMenuItem menuItemclose=new JMenuItem("close");     menuItemclose.addActionListener(MenuEvent);     menuFile.add(menuItemopen);     menuFile.add(menuItemclose);     JMenu menuTool=new JMenu("tool");     JMenuItem menuItemrun=new JMenuItem("run");     menuItemrun.addActionListener(MenuEvent);     JMenuItem menuItemstop=new JMenuItem("stop");     menuItemstop.addActionListener(MenuEvent);     menuTool.add(menuItemrun);     menuTool.add(menuItemstop);     menubar.add(menuFile);     menubar.add(menuTool);     menubar.setVisible(true);     frame.add(menubar,BorderLayout.NORTH);     frame.setSize(400,200);     frame.setVisible(true);   }   public static void main(String[] args){     new TestAbstractEvent();   } } 

import java.awt.BorderLayout; import java.awt.event.ActionEvent; import javax.swing.*;  class ViewAction extends AbstractAction{   private String ActionName="";   //private JFrame frame=null;   private Action action=null;   public ViewAction(){   }   public ViewAction(String ActionName){     this.ActionName=ActionName;     //this.frame=frame;   }   @Override   public void actionPerformed(ActionEvent e) {     Action action=getAction(this.ActionName);     action.execute();   }   private Action getAction(String ActionName){     try{       if (this.action==null){         Action action=(Action)Class.forName(ActionName).newInstance();         this.action=action;       }       return this.action;     }catch(Exception e){     return null;     }   } } public class TestAE extends JFrame {   public JToolBar bar=new JToolBar();   String buttonName[]={"b1","b2","b3"};   public TestAE(){     super("事件");     for (int i=0;i<buttonName.length;i++){       ViewAction action=new ViewAction(buttonName[i]);       JButton button=new JButton(buttonName[i]);       button.addActionListener(action);       bar.add(button);     }     this.getContentPane().add(bar,BorderLayout.NORTH);     this.setSize(300, 200);     this.setLocationRelativeTo(null);     this.setVisible(true);   }   public static void main(String [] args){     new TestAE();   } } interface Action{   void execute(); } class b1 implements Action{   public void execute(){     JOptionPane.showMessageDialog(null, "单击了 b1");   } } class b2 implements Action{   public void execute(){     JOptionPane.showMessageDialog(null, "单击了 b2");   } } class b3 implements Action{   public void execute(){     JOptionPane.showMessageDialog(null, "单击了 b3");   } }