keylistenerdemo.java

java课程的资料以及实验的代码

import java.awt.*;
import java.awt.event.*;
public class KeyListenerDemo  {

	/**
	 * @param args
	 */
	Frame fr;
	KeyListenerDemo()
	{
		fr=new Frame("Title");
		MyPanel pp=new MyPanel();
		fr.add(pp);
		fr.setSize(300,300);
		fr.setVisible(true);
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
      new KeyListenerDemo();
	}

}
class MyPanel extends Panel {
	   public MyPanel() {
	      TextField tField = new TextField(20);
	      add(tField);
	      MyKeyAdapter bAction = new MyKeyAdapter();
	      tField.addKeyListener(bAction);
	   }
  private class MyKeyAdapter extends KeyAdapter {
	       public void keyPressed(KeyEvent kevent){
	         setBackground(Color.blue); repaint(); }
	      public void keyReleased(KeyEvent kevent) {
	         setBackground(Color.red); repaint();  }
	      public void keyTyped(KeyEvent kevent) {
	    	
	    	  //if(kevent.getKeyCode()==KeyEvent.VK_E)
	        if (kevent.getKeyChar() == 'x')  System.exit(0); }
	   }
	}