import java.awt.*;
import java.awt.event.*;
import java.applet.*;public class Applet1 extends Frame implements ActionListener { Button bt1,bt2;
Label 11;
Applet1(){
super("Window1");
addWindowListener(this);
setSize(400,200);
bt1=new Button("111");
bt2=new Button("222");
11=new Label("点击任意按钮");
setLayout(new FlowLayout());
add(11);
add(bt1);
add(bt2);
bt1.addActionListener(this);
bt2.addActionListener(this);
show();
}
public void windowClosing(WindowEvent e) {
System.exit(0);
}
public void windowOpen(WindowEvent e);
public void windowClose(WindowEvent e);
public void windowIconified(WindowEvent e);
public void windowDeiconified(WindowEvent e);
public void windowActivate(WindowEvent e);
public void windowDeactivate(WindowEvent e);
public static void main(String args[]){
new Applet1();
}
public void actionPerformed(ActiveEvent e){
11.setText("你按下的是"+e.getActionCommand()+"");
}}

解决方案 »

  1.   

    import java.awt.*;
    import java.awt.event.*;
    import java.applet.*;class Test extends Frame implements ActionListener { Button bt1,bt2;
    Label l11;
    Test(){
    super("Window1");

    setSize(400,200);
    bt1=new Button("111");
    bt2=new Button("222");
    l11=new Label("点击任意按钮");
    setLayout(new FlowLayout());
    addWindowListener(new WindowAdapter(){
                 public void windowClosing(WindowEvent e){
                     System.exit(0);
                 }
             });
    add(l11);
    add(bt1);
    add(bt2);
    bt1.addActionListener(this);
    bt2.addActionListener(this);
    show();
    } public static void main(String args[]){
    new Test();
    }     public void actionPerformed(ActionEvent e) {
    l11.setText("你按下的是"+e.getActionCommand()+"");
         }
    一、利用适配器WindowAdapter,他实现了接口中所有方法,但是方法体是空的,所以你只要覆盖你需要覆盖的方法就可以了
    二、不要用数字做变量名
    三、最后public void actionPerformed(ActionEvent e)中,是ActionEvent不是ActiveEvent,你把我累死了,我用IDE工具去编辑才发现这个问题