将布局设置为 JPanel 会重置按钮

Question

这是我想要的结果：http://imgur.com/tGleIly , but centered using BorderLayout. Instead, i get this :http://imgur.com/jYgjM1F。所以，基本上设置布局会重置我的背景并将按钮放在整个框架上：

frame.setContentPane(new Pane());
frame.getContentPane().setBackground(Color.GRAY);

我也试过这个：

JPanel panel = new JPanel();
panel.add(bStart);
add(panel, BorderLayout.CENTER);

但是没用。

public class Pane extends JPanel{
    public Pane(){
        ImageIcon start = new ImageIcon("Start.png");
        ImageIcon startroll = new ImageIcon("Start-Hover.png");
        ImageIcon startselect = new ImageIcon("Start-Pressed.png");

        JButton bStart = new JButton(start);


        Insets margin = new Insets(-10,-10,-10,-10);
        bStart.setMargin(margin);
        bStart.setRolloverEnabled(true);
        bStart.setRolloverIcon(startroll);
        bStart.setPressedIcon(startselect);
        bStart.setBorderPainted(false);


        setLayout(new BorderLayout());
        add(bStart, BorderLayout.CENTER);

Answer 1

frame.getContentPane.setLayout(new GridBagLayout());

将布局设置为 JPanel 会重置按钮

Setting Layout to JPanel resets Buttons

java

swing

layout-manager