如何确定在java中是否按下了鼠标按钮？

import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

public class MyMouseListener implements MouseListener {
    @Override
    public void mouseClicked(MouseEvent e) {
        // 鼠标点击事件
    }

    @Override
    public void mousePressed(MouseEvent e) {
        // 鼠标按下事件
        int button = e.getButton();
        if (button == MouseEvent.BUTTON1) {
            System.out.println("左键按下");
        } else if (button == MouseEvent.BUTTON2) {
            System.out.println("中键按下");
        } else if (button == MouseEvent.BUTTON3) {
            System.out.println("右键按下");
        }
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        // 鼠标释放事件
    }

    @Override
    public void mouseEntered(MouseEvent e) {
        // 鼠标进入组件事件
    }

    @Override
    public void mouseExited(MouseEvent e) {
        // 鼠标离开组件事件
    }
}

import javax.swing.JFrame;

public class MainFrame extends JFrame {
    public MainFrame() {
        // 设置窗口属性...

        MyMouseListener mouseListener = new MyMouseListener();
        addMouseListener(mouseListener);
    }

    public static void main(String[] args) {
        MainFrame frame = new MainFrame();
        frame.setVisible(true);
    }
}