import java.awt.*;

import java.awt.event.*;

import java.applet.*;

import java.applet.Applet;

public class UseTextEvent extends Applet implements ActionListener, TextListener

{

TextField tOld;

TextArea tNew;

Panel p;

public void init()

{

tOld = new TextField(25);

tNew = new TextArea(8,25);

// 添加事件监听者

tOld.addActionListener(this);

tOld.addTextListener(this);

// 设置界面

p = new Panel(new BorderLayout());

p.add(tOld, BorderLayout.NORTH);

p.add(tNew, BorderLayout.SOUTH);

add(p);

}

// 响应文本事件

public void textValueChanged(TextEvent e)

{

if (e.getSource() == tOld)

{

tNew.setText(tOld.getText());

}

}

// 响应动作事件

public void actionPerformed(ActionEvent e)

{

if (e.getSource() == tOld)

{

tNew.setText("");

}

}

}