如何在Java中同时处理按键？

import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;

public class MultipleKeyPresses extends JFrame {

    public MultipleKeyPresses() {
        setTitle("同时处理多个按键");
        setSize(300, 200);
        setDefaultCloseOperation(EXIT_ON_CLOSE);

        addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                System.out.println("按键按下: " + KeyEvent.getKeyText(e.getKeyCode()));
            }

            @Override
            public void keyReleased(KeyEvent e) {
                System.out.println("按键释放: " + KeyEvent.getKeyText(e.getKeyCode()));
            }
        });

        setVisible(true);
    }

    public static void main(String[] args) {
        new MultipleKeyPresses();
    }
}