10.31clicker.java

JAVA程序设计的源代码

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Clicker extends Applet implements ActionListener
{
TextField t;
Button b;
public void init()
{
t=new TextField(20);
add(t);
b=new Button("click me");
add(b);
b.addActionListener(this);    //设置事件监听
}
public void actionPerformed(ActionEvent e)    //事件处理函数
{
String msg=new String ("Welcome to USA");
if(e.getSource() == b)    //获取事件源
{
t.setText(msg);
}
}
}