Java GUI之KeyListener

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Java GUI之KeyListener，用于键盘监听事件，继承自EventListener，可以监听键盘按键的按下，释放等操作。

如下是KeyListen接口的定义:

public interface KeyListener extends EventListener {    /**     * Invoked when a key has been typed.     * See the class description for {@link KeyEvent} for a definition of     * a key typed event.     */    public void keyTyped(KeyEvent e);    /**     * Invoked when a key has been pressed.     * See the class description for {@link KeyEvent} for a definition of     * a key pressed event.     */    public void keyPressed(KeyEvent e);    /**     * Invoked when a key has been released.     * See the class description for {@link KeyEvent} for a definition of     * a key released event.     */    public void keyReleased(KeyEvent e);}

public class KeyBoardListen extends JFrame {   /**    *     */   private static final long serialVersionUID = 1L;   private String s = null;   private JLabel label;   KeyBoardListen() {      setLayout(new FlowLayout());      label = new JLabel();      addKeyListener(new KeyListener() {         @Override         public void keyTyped(KeyEvent e) {            // TODO Auto-generated method stub            s = "按下的键是Type：" + e.getKeyChar();            label.setText(s);            System.out.println(s);         }         @Override         public void keyReleased(KeyEvent e) {            // TODO Auto-generated method stub            s = "释放的键是：" + e.getKeyChar();            label.setText(s);            System.out.println(s);         }         @Override         public void keyPressed(KeyEvent e) {            // TODO Auto-generated method stub            s = "按下的键是Press：" + e.getKeyChar();            label.setText(s);            System.out.println(s);         }      });      add(label);      setBounds(350, 100, 600, 500);      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);      setVisible(true);   }   public static void main(String[] args) {      new KeyBoardListen();   }}
源码地址:https://github.com/followwwind/javase

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