Java代码: Cant move JButtons in JFrame

Question

我一直在关注一个教程，它有点旧，1.6 Java，我使用1.8。所以有些事情发生了变化，这是我的代码:

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);

}

当我更改 rplay 的 x 位置、y 位置、宽度或高度时，没有任何反应。它保持在屏幕中央，我无法弄清楚。

• 顺便说一句，公共(public)启动器正在从不同类的 main 方法中调用。

Answer 1

所以，我没有一行代码需要阻止它成为布局管理器的父级。

window.setLayout(null);

在

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();
}