例項：監聽鍵盤的上下左右鍵

/**
 * KeyListener：鍵盤監聽事件
 * @author Administrator
 */
public class KeyListenerDemo {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		JFrame frame = new JFrame("視窗程式");//建立一個帶標題的視窗物件frame
		frame.setVisible(true);//顯示視窗
		frame.setSize(600, 400);//設定視窗大小
		frame.setLocationRelativeTo(null);//設定視窗居中
		frame.setDefaultCloseOperation(3);//點選X關閉程式  3為結束程式	
		frame.setLayout(null);//清空佈局
		Button button = new Button("按鈕");
		button.setBounds(100,100,100,50);
		button.setBackground(Color.ORANGE);
		MyKeyListener myKeyListener = new MyKeyListener(button);//建立一個鍵盤監聽事件物件
		frame.addKeyListener(myKeyListener);//新增myKeyListener鍵盤監聽事件
		frame.add(button);
	}

}
class MyKeyListener  implements KeyListener{
	
	private Button button;

	public MyKeyListener(Button button) {
		super();
		this.button = button;
	}

	@Override
	public void keyTyped(KeyEvent e) {
		// TODO Auto-generated method stub
		
	}

	//每按下一個任意鍵盤，此方法都會自動呼叫一次
	@Override
	public void keyPressed(KeyEvent e) {
		// TODO Auto-generated method stub
		
		/*
		 * 監聽鍵盤上下左右鍵，改變按鈕的座標
		 */
		int keyCode = e.getKeyCode();//獲取所按鍵盤的鍵盤編碼

		int x = button.getX();//獲取按鈕當前的橫座標值
		int y = button.getY();//獲取按鈕當前的縱座標值
		int width = button.getWidth();//獲取按鈕當前的寬
		int height = button.getHeight();//獲取按鈕當前的高
		
		if (keyCode == KeyEvent.VK_UP) {  //KeyEvent.VK_UP上鍵編碼
			button.setBounds(x, y-20, width, height);
		}else if (keyCode == KeyEvent.VK_DOWN) {  //下鍵
			button.setBounds(x, y+20, width, height);
		}else if (keyCode == KeyEvent.VK_LEFT) {  //左鍵
			button.setBounds(x-20, y, width, height);
		}else if (keyCode == KeyEvent.VK_RIGHT) {  //右鍵
			button.setBounds(x+20, y, width, height);
		}
	}

	@Override
	public void keyReleased(KeyEvent e) {
		// TODO Auto-generated method stub
		
	}
	
}