将JLabel放在JPanel中的Graphics 2D Rectangle前面 [英] Put JLabel in front of Graphics 2D Rectangle in JPanel

问题描述

是否可以将JLabel放置在矩形的前面?目前，JLabel位于矩形下方.

Is there any way to put the JLabel in front of the rectangle? Currently, the JLabel is underneath the rectangle.

这是我的相关代码:

public class MainMenu_South extends JPanel {
        MainMenu_BlueJay t; 
        JLabel start=new JLabel("START");

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        Graphics2D g2d = (Graphics2D) g;
        g2d.setColor(Color.blue);
        g2d.drawRect(0, 30, 900, 30); 
        g2d.fillRect(0, 30, 900, 30);
    }

    public MainMenu_South(MainMenu_BlueJay t){

        setLayout(null);
        this.t=t;
        setBackground(Color.white);

        start.setForeground(Color.red);
        start.setFont(new Font("Arial", Font.BOLD, 16));

        add(start);
        start.setBounds(100, 10, 100, 50);
        start.addMouseListener(ml);
    }

    MouseListener ml=new MouseListener() {

        @Override
        public void mouseEntered(MouseEvent e) {//hover
           start.setForeground(Color.white);
        }

        @Override
        public void mouseExited(MouseEvent e) {
            start.setForeground(Color.red);
        }
    };

}

推荐答案

1. 为获得更好的帮助，请尽快发布 MCVE

将paintComponent()用于Swing JComponents，而不是paint()

use paintComponent() for Swing JComponents instead of paint()

没有理由使用NullLayout，LayoutManager，

覆盖getPreferredSize到JPanel，然后JFrame.pack()将在屏幕上生成预期的Dimension

override getPreferredSize for JPanel, then JFrame.pack() will generate expected Dimension on the screen

JLabel是透明的，如果要在Jlabel

JLabel is transparent, you have to setOpaque if you to want to dispaly Color as Backgroung in Jlabel

您必须将repaint(last code line)用于MouseEvents，将Color用于JLabel，覆盖MouseAdapter

you have to use repaint(last code line) for MouseEvents and Color for JLabel, override MouseAdapter

不遗漏，不知道您是否需要使用透明性或半透明性，或删除JLabel

miss any, no idea if you would need use transparency or tranclucency, or remove the JLabel

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