ch13_4.java

java练习程序

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

class sunpanel extends Panel
{
	Checkbox box1,box2;
	sunpanel()
	{
		setLayout(new GridLayout(1,2));
		box1=new Checkbox("音乐");
		box2=new Checkbox("美术");
		add(box1);add(box2);
	}
}

public class Ch13_4 extends Applet implements ItemListener
{
	sunpanel panel1;
	Label Label1;
	TextArea text1;
	GridLayout net;
	public void init()
	{
		net=new GridLayout(3,1);
		setLayout(net);
		panel1=new sunpanel();
		Label1=new Label("您的爱好",Label.CENTER);
		text1=new TextArea();
		add(Label1);
		add(panel1);
		add(text1);
		panel1.box1.addItemListener(this);
		panel1.box2.addItemListener(this);
	}
	public void itemStateChanged(ItemEvent e)
	{
		if((e.getItemSelectable()==panel1.box1)&&(panel1.box1.getState()==true))
		{
			text1.setText("喜欢什么歌曲?");
		}
		else if((e.getItemSelectable()==panel1.box2)&&(panel1.box2.getState()==true))
		{
			text1.setText("喜欢什么派别?");
		}
		else if((panel1.box1.getState()==false)&&(panel1.box2.getState()==false))
		{
			text1.setText("为什么不喜欢歌曲和美术?");
		}
	}
}