keylistener.java

Java课程中所有的可运行程序 全部都是java课程中所涉及到的源码

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

public class keylistener extends Frame{
   TextField txt=new TextField("");
   public Label l1=new Label("init                                                   ");

    public  keylistener(){
        setLayout(new FlowLayout());

         txt.addKeyListener(new MyKeyListener());
         add(txt);

         add(l1);

      this.setSize(400,300);
        this.setVisible(true);
    }

public static void main(String[] args){
  keylistener nowframe=new keylistener();
  nowframe.addWindowListener(new WindowAdapter(){
   public void windowClosing(WindowEvent e){
    System.exit(0);
         }
  });
  }


class MyKeyListener implements KeyListener
{int nKeycode;
	public void  keyPressed(KeyEvent e){
		nKeycode=e.getKeyCode();
 l1.setText("键盘按下的键为:"+e.getKeyText(nKeycode));}

 public void  keyReleased(KeyEvent e){
	 nKeycode=e.getKeyCode();
l1.setText("键盘释放的键为:"+e.getKeyText(nKeycode));}

 public void  keyTyped(KeyEvent e){
	 }
}
}