里面这段代码哪里错了,我这里执行没效果,HELP
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
class MyButton extends Button implements ActionListener,TextListener
{
TextArea text1,text2;
MyButton(String s)
{
super(s);
text1=new TextArea(8,8);
text2=new TextArea(10,10);
text1.addTextListener(this);
this.addActionListener(this);
}
public void textValueChanged(TextEvent e)
{
text2.setText(text1.getText());
}
public void actionPerformed(ActionEvent e)
{
text1.setText(null);
}
}
public class Example9_4 extends Applet implements ActionListener
{
MyButton button;
public void init()
{
button=new MyButton("点击我看能发生什么");
button.addActionListener(this);
add(button.text1);add(button.text2);add(button);
}
public void actionPerformed(ActionEvent e)
{
button.text1.setText(button.getLabel());
button.text2.setText("OK");
}
}