Java - set opacity in JPanel

Question

Let\'s say I want to make the opacity of a JPanel %20 viewable? I don\'t mean setOpaque (draw or not draw) or setVisible (show or hide)... I mean make it see-through JPanel.

Answer 1

If you have a custom panel and want the whole thing to be semi-transparent, I advise you to do override its method paintComponent like this :

@Override
    protected void paintComponent(Graphics graphics) {
        super.paintComponent(graphics);
        Graphics2D g2d = (Graphics2D) graphics;
        g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f));
    }