keysevent.java

GUI事件处理例子

import java.awt.*;
import java.awt.event.*;
public class KeysEvent extends Frame implements KeyListener{
	 static KeysEvent frm=new KeysEvent();
	   static TextField txf;
	   static TextArea txa;
	   public static void main(String args[])
	  {
	  	 frm.setTitle("KeyEvent");
	  	 frm.setSize(240,200);
	  	 frm.setLayout(new FlowLayout());
	      txf=new TextField(20);   
	  	 txa=new TextArea(6,20); 
	  	 txa.setEditable(false);
	  	 txf.addKeyListener(frm);
	  	 frm.add(txf);
	     frm.add(txa);
	     frm.setVisible(true);
	   }
	    public void keyPressed(KeyEvent e)
	     { 
	        txa.setText("");
	        txa.append(e.getKeyChar()+" is pressed!\n");
	     }
	    public void keyReleased(KeyEvent e)	
	     {	
	        txa.append(e.getKeyChar()+" is released!\n");
	     }
	    public void keyTyped(KeyEvent e)
	     {      	
	        txa.append(e.getKeyChar()+" is typed!\n");
   }
}