Java如何在窗口或JFrame的边框/周围放置按钮

Question

How do I put a button on the border that surrounds the frame like this cog:

Answer 1

_"Is the a short example anywhere? "

Yea, here... This very basic. You need to do alot more to it. You'll notice I have to add a MouseMotionListener to the JPanel that acts as the top frame border, because when you remove the decoration from the frame, you're also taking away that functionality. So the MouseMotionListener makes the frame draggable again.

You would also have to implement resizing if you wished. I already implemented the System exit()` when you press the image. Test it out. You need to provide your own image.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.LineBorder;

public class UndecoratedExample {
    static JFrame frame = new JFrame();
    static class MainPanel extends JPanel {

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(400, 400);
        }
    }

    static class BorderPanel extends JPanel {

        JLabel stackLabel;
        int pX, pY;

        public BorderPanel() {
            ImageIcon icon = new ImageIcon(getClass().getResource(
                    "/resources/stackoverflow1.png"));
            stackLabel = new JLabel();
            stackLabel.setIcon(icon);

            setBackground(Color.black);
            setLayout(new FlowLayout(FlowLayout.RIGHT));

            add(stackLabel);

            stackLabel.addMouseListener(new MouseAdapter() {
                public void mouseReleased(MouseEvent e) {
                    System.exit(0);
                }
            });
            addMouseListener(new MouseAdapter() {
                public void mousePressed(MouseEvent me) {
                    // Get x,y and store them
                    pX = me.getX();
                    pY = me.getY();
                }
            });
            addMouseMotionListener(new MouseAdapter() {
                public void mouseDragged(MouseEvent me) {
                    frame.setLocation(frame.getLocation().x + me.getX() - pX, 
                            frame.getLocation().y + me.getY() - pY);
                }
            });
        }
    }

    static class OutsidePanel extends JPanel {

        public OutsidePanel() {
            setLayout(new BorderLayout());
            add(new MainPanel(), BorderLayout.CENTER);
            add(new BorderPanel(), BorderLayout.PAGE_START);
            setBorder(new LineBorder(Color.BLACK, 5));
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {

                frame.setUndecorated(true);
                frame.add(new OutsidePanel());
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }
}