buttonexample.java

刘艺编著的java教程的课本习题加例题代码 很有用哦！

package buttonexample;

import java.awt.*;
import java.applet.*;
import java.awt.event.*;                              //打开事件处理相应的包
public class ButtonExample extends Applet implements ActionListener { //implements事件的接口
   TextField name=new TextField(30);
   TextField pw=new TextField(30);
   TextField pw1=new TextField(30);
   Label la1=new Label();
   Label la2=new Label();
   Label la3=new Label();
   Button b1=new Button("ok");

public void actionPerformed(ActionEvent e) {
     if(e.getSource()==pw)  pw1.setText("action from pw textfield");  //pw引发动作事件
     else if(e.getSource()==b1) pw1.setText("action from b1 button");  //b1引发动作事件                       
     }
public void init() {
   this.setLayout(new FlowLayout());
   la1.setText("         name:");
   this.add(la1);
   this.add(name);
   la2.setText("     password:");
   this.add(la2);
   pw.setEchoChar('*');
   this.add(pw);
   pw.addActionListener(this);  //设置pw的监听者为this
   la3.setText("show password:");
   this.add(la3);
   this.add(pw1);
   this.add(b1);
   b1.addActionListener(this);
}
}