e5_15y.java

java 初学者学习实例

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

public class E5_15y extends Applet implements ItemListener,ActionListener
{
	List list1,list2;
	TextField text1,text2;
	public void init()
	{
		setLayout(new GridLayout(2,2));
		list1 = new List(); 
		list2 = new List(); 
		text1 = new TextField(10);
		text2 = new TextField(10);
		list1.add("音乐天地");
		list1.add("武术天地");
		list1.add("象棋乐园");
		list1.add("交友聊天");
		list2.add("辽宁日报");
		list2.add("北京日报");
		list2.add("上海日报");
		list2.add("足球晚报");
		add(list1);add(list2);
		add(text1);add(text2);
		list1.addItemListener(this);
		list2.addItemListener(this);
		list1.addActionListener(this);
		list2.addActionListener(this);
		
	}
   	public void itemStateChanged(ItemEvent e)
	{
		if(e.getItemSelectable() == list1)
		{
			if(list1.getSelectedIndex() == 0)
			{text1.setText("梁祝");}
			else if(list1.getSelectedIndex() == 1)
			{text1.setText("少林拳");}
			else if(list1.getSelectedIndex() == 2)
			{text1.setText("以棋交友");}
			else if(list1.getSelectedIndex() == 3)
			{text1.setText("知心朋友");}
		}
		else if(e.getItemSelectable() == list2)
		{
			if(list2.getSelectedIndex() == 0)
			{text1.setText("好");}
			else if(list2.getSelectedIndex() == 1)
			{text1.setText("很好");}
			else if(list2.getSelectedIndex() == 2)
			{text1.setText("不错");}
			else if(list2.getSelectedIndex() == 3)
			{text1.setText("哎");}
		}
	}
	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource() == list1)
		{
			if(list1.getSelectedIndex() == 0)
			{text2.setText("梁祝dd");}
			else if(list1.getSelectedIndex() == 1)
			{text2.setText("少林拳dd");}
			else if(list1.getSelectedIndex() == 2)
			{text2.setText("以棋交友dd");}
			else if(list1.getSelectedIndex() == 3)
			{text2.setText("知心朋友dd");}
		}
		else if(e.getSource() == list2)
		{
			if(list2.getSelectedIndex() == 0)
			{text2.setText("好dd");}
			else if(list2.getSelectedIndex() == 1)
			{text2.setText("很好dd");}
			else if(list2.getSelectedIndex() == 2)
			{text2.setText("不错dd");}
			else if(list2.getSelectedIndex() == 3)
			{text2.setText("哎dd");}
		}
	}

}