btnevt_adv.java

java练习程序

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

public class BtnEvt_Adv extends Applet implements ActionListener,TextListener
{
  TextArea text1,text2;
  Button Btn;
  public void init()
  {
  	text1=new TextArea(" ",10,10);
  	text2=new TextArea(" ",10,10);
  	add(text1);
  	add(text2);
  	Btn=new Button("确定");
 	add(Btn);
  	text1.addTextListener(this);
  	Btn.addActionListener(this);
  }
  public void textValueChanged(TextEvent e)
  {
  	if(e.getSource()==text1)
  	{
  		text2.setText(text1.getText());
  	}else
  	{
  	}
  }
  public void actionPerformed(ActionEvent e)
  {
  	if(e.getSource()==Btn)
  	{
  		text2.setText("我按了确定按钮");
  	}else
  	{
  	}
  }
}
/*
public class ch8_1 extends Applet
{
  
  String s;
  public void init()
  {
  	text1=new TextArea(10);
  	text1.setEditable(false);
  	text2=new TextArea(10);
//  	text2.setEchoChar('*'); 	
  	text3=new TextArea("文本框",20);
  	
  	add(text1);
  	add(text2);
  	add(text3);
  	s=text2.getText();
  	text3.setText(s);
  }
}
*/