buttondemo.java

来自「这是我们上java课时自己编的几个测试小程序」· Java 代码 · 共 42 行

/**
 * @(#)ButtonDemo.java
 *
 *
 * @author 
 * @version 1.00 2007/11/4
 */


import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class ButtonDemo extends Applet implements ActionListener
{	String msg="";
	Button yes,no,maybe;
	public void init()
	{	yes=new Button("Yes");
		no=new Button("No");
		maybe=new Button("Undecided");
		add(yes);
		add(no);
		add(maybe);
		yes.addActionListener(this);
		no.addActionListener(this);
		maybe.addActionListener(this);
	}
	public void actionPerformed(ActionEvent ae)
	{	String str=ae.getActionCommand();
		if(str.equals("Yes"))
		msg="You pressed Yes.";
		else if(str.equals("No"))	
		msg="You pressed No.";
		else
		msg="You pressed Undecided.";
		repaint();
	}
	public void paint(Graphics g)
	{
		g.drawString(msg,6,100);	
	}
}