Java实现中的Keylistener。

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

public class MyKeyListener implements KeyListener {
    public void keyPressed(KeyEvent e) {
        // 处理按键按下事件
        int keyCode = e.getKeyCode();
        System.out.println("Key pressed: " + KeyEvent.getKeyText(keyCode));
    }

    public void keyReleased(KeyEvent e) {
        // 处理按键释放事件
        int keyCode = e.getKeyCode();
        System.out.println("Key released: " + KeyEvent.getKeyText(keyCode));
    }

    public void keyTyped(KeyEvent e) {
        // 处理按键输入事件
        char keyChar = e.getKeyChar();
        System.out.println("Key typed: " + keyChar);
    }

    public static void main(String[] args) {
        // 创建一个窗口并注册Keylistener对象
        JFrame frame = new JFrame("Keylistener Example");
        MyKeyListener listener = new MyKeyListener();
        frame.addKeyListener(listener);
        frame.setSize(300, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}