Java代码：无法在JFrame中移动JButton

Question

I have been following a tutorial, its a little old, 1.6 Java, I use 1.8. So something has changed, heres my code:

private int width = 600;
private int height = 400;

private int lHeight = 4;

private int bWidth = 80;
private int bHeight = 40;

private int lItemWidth = 5;

private JPanel window = new JPanel();
private JButton play, options, help, updatenotes, quit;
private Rectangle rplay, roptions, rhelp, rupdatenotes, rquit;

public Launcher() {
    try{
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }catch (Exception e) {
        e.printStackTrace();
    }
    setTitle("Launcher - Final frontier");
    setSize(new Dimension(width, height));
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    getContentPane().add(window);
    setLocationRelativeTo(null);
    setVisible(true);
    setResizable(false);

    drawButtons();
}

private void drawButtons() {
    play = new JButton("Play");
    rplay = new Rectangle(0, 0, bWidth, bHeight);
    play.setBounds(rplay);
    window.add(play);

}

When I change rplay's x position, y position, width, or height nothing happens. It stays centered to the center of the screen and I cant figure it out.

• BTW public Launcher is being called from the main method in a different class.

Answer 1

So, I didn't have a line of code need to stop it from parenting to a layout manager.

window.setLayout(null);

in

public Launcher() {
    try{
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }catch (Exception e) {
        e.printStackTrace();
    }
    setTitle("Launcher - Final frontier");
    setSize(new Dimension(width, height));
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    getContentPane().add(window);
    setLocationRelativeTo(null);
    setVisible(true);
    setResizable(false);

    //Here
    window.setLayout(null);

    drawButtons();
}