使JFrame在窗口中不可拖动

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class NonDraggableFrame extends JFrame {
    private int mouseX, mouseY;

    public NonDraggableFrame() {
        // 移除默认标题栏
        setUndecorated(true);

        // 设置窗口大小和位置
        setSize(400, 300);
        setLocationRelativeTo(null); // 居中显示

        // 添加一个自定义的鼠标监听器来处理拖动事件
        addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                mouseX = e.getX();
                mouseY = e.getY();
            }
        });

        addMouseMotionListener(new MouseAdapter() {
            @Override
            public void mouseDragged(MouseEvent e) {
                int deltaX = e.getX() - mouseX;
                int deltaY = e.getY() - mouseY;
                setLocation(getLocation().x + deltaX, getLocation().y + deltaY);
            }
        });

        // 添加一些内容到窗口
        getContentPane().setBackground(Color.LIGHT_GRAY);
        JLabel label = new JLabel("This is a non-draggable JFrame");
        label.setHorizontalAlignment(SwingConstants.CENTER);
        getContentPane().add(label);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            NonDraggableFrame frame = new NonDraggableFrame();
            frame.setVisible(true);
        });
    }
}