JFrame 中的多个 PNG

Multiple PNG's in JFrame

我试图在 JFrame 中显示多个具有透明背景的 png,但它们始终具有白色背景。

这是我的代码:

JFrame frame = this;
frame.setUndecorated(true);

back1 = new ImageIcon("res/launcher/back_1.png");
JLabel label = new JLabel(back1);
label.setOpaque(false);
label.repaint();
frame.add(label);

play_btn = new ImageIcon("res/launcher/play_btn.png");
label = new JLabel(play_btn);
label.setOpaque(false);
label.repaint();
frame.add(label);

frame.setTitle("Schach");
frame.setSize(WIDTH, HEIGHT);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
frame.setLocation(dim.width / 2 - this.getSize().width / 2, dim.height / 2 - this.getSize().height / 2); // JFrame in middle of screen
frame.setVisible(true);

frame.repaint();

修复如下:

JLabel back1 = new JLabel(new ImageIcon("res/launcher/back_1.png"));
        back1.setLayout( new BorderLayout() );
        JLabel knight = new JLabel(new ImageIcon("res/launcher/play_btn.png"));
        back1.add(knight);
        frame.add(back1);