import java.awt.*;

import java.awt.event.*;

public class Eventest

{

Button btn1=new Button("单击");

Frame myframe=new Frame("测试单击事件");

public void init(){

btn1.setSize(30,26);

btn1.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

if(btn1.getBackground()==Color.red)

btn1.setBackground(Color.white);

else

btn1.setBackground(Color.red);

}

});

myframe.setBounds(300,200,200,200);

myframe.add(btn1);

myframe.setVisible(true);

}

public static void main(String[] args)

{

new Eventest().init();

}

}