在Java中检测按键是否被按下

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

public class MyKeyListener implements KeyListener {
    @Override
    public void keyPressed(KeyEvent e) {
        int keyCode = e.getKeyCode();
        System.out.println("按键被按下: " + KeyEvent.getKeyText(keyCode));
        // 在这里可以执行相应的操作
    }

    @Override
    public void keyReleased(KeyEvent e) {
        int keyCode = e.getKeyCode();
        System.out.println("按键被释放: " + KeyEvent.getKeyText(keyCode));
        // 在这里可以执行相应的操作
    }

    @Override
    public void keyTyped(KeyEvent e) {
        char keyChar = e.getKeyChar();
        System.out.println("字符被输入: " + keyChar);
        // 在这里可以执行相应的操作
    }
}

import javax.swing.JFrame;

public class Main {
    public static void main(String[] args) {
        JFrame frame = new JFrame("按键检测");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        MyKeyListener listener = new MyKeyListener();
        frame.addKeyListener(listener);
        
        frame.setSize(300, 200);
        frame.setVisible(true);
    }
}