JPanel EAST 和 CENTER 面板似乎重叠

Question

我看过很多类似的帖子，但是none似乎和我的问题一样，看起来比较简单。我有以下代码：

public PlayScreen(Player player){
    this.player = player;
    playScreen = new JPanel();
    playScreen.setLayout(new BorderLayout());
    setTowerButtons();
    playScreen.add(towerButtons, BorderLayout.EAST);     //line 6
    setDetailLabels();
    playScreen.add(detailPanel, BorderLayout.WEST);
    setMap("map.png");
    playScreen.add(new JButton("hello"), BorderLayout.CENTER);     //line 10
    playScreen.setVisible(true);
}

public class View {
private JFrame frame;
private Container contentPane;
private Player player;
private LoadScreen loadScreen;
private PlayScreen playScreen;
public View(Player player){
    frame = new JFrame("Display");
    contentPane = frame.getContentPane();
    contentPane.setLayout(new BorderLayout());
    this.player = player;
    frame.setVisible(true);
    frame.pack();
}

public void makeLoadScreen(){
    loadScreen = new LoadScreen();
    contentPane.add(loadScreen.getLoadScreen(), BorderLayout.CENTER);
    frame.pack();
}

public void makePlayScreen(Player player){
    contentPane.remove(loadScreen.getLoadScreen());;
    playScreen = new PlayScreen(player);
    contentPane.add(playScreen.getPlayScreen());
    frame.pack();
}

public class LoadScreen{
    private JPanel loadScreen;
    public LoadScreen(){
        loadScreen = new JPanel();
        JButton play = new JButton("Play");
        JButton load = new JButton("Load");
        loadScreen.setLayout(new GridLayout(2,1,0,0));
        loadScreen.add(play);
        loadScreen.add(load);
        play.addActionListener(new OpenActionListener());
        load.addActionListener(new LoadActionListener());
    }

    public class OpenActionListener implements ActionListener{
        public void actionPerformed(ActionEvent e){
            makePlayScreen(player);
        }
    }

}

}

首次创建视图 class。我手动调用 makeLoadScreen() 方法（虽然我稍后会更改它以自动执行此操作），它创建了嵌套 class 中描述的 LoadScreen。这给出了两个按钮的视图，播放和加载。单击播放然后创建问题所在的 PlayScreen。

当它是运行时，detailPanel 总是按预期显示在左上角。但是 towerButtons 面板消失了，"hello" 按钮显示出来，填满了屏幕的其余部分。如果我切换第 6 行和第 10 行，"hello" 按钮就会消失并显示 towerButtons 面板，填满屏幕的其余部分。

相反，我希望 towerButtons 显示在右侧，"hello" 按钮位于此按钮和 detailPanel 之间。

编辑：添加了其余代码，应该早点完成，抱歉！ Edits2：问题出在 "towerButtons," 与 JPanel 的覆盖无关。

Answer 1

I would like the towerButtons to show on the right, with the "hello" button in between this and the detailPanel.

问题可能出在您的代码中的其他地方，所以我认为这对您没有帮助，但在这里：

public class Example extends JFrame {

    Example() {

        JPanel playScreen = new JPanel();
        playScreen.setLayout(new BorderLayout());

        JPanel towerButtons = new JPanel();
        towerButtons.add(new JLabel("towerButtons"));
        playScreen.add(towerButtons, BorderLayout.EAST);

        JPanel detailPanel = new JPanel();
        detailPanel.add(new JLabel("detailPanel"));
        playScreen.add(detailPanel, BorderLayout.WEST);

        playScreen.add(new JButton("hello"), BorderLayout.CENTER);

        add(playScreen);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public static void main(String args[]) {

        new Example();
    }
}

JPanel EAST 和 CENTER 面板似乎重叠

JPanel EAST and CENTER panels seem to overlay

java

swing

layout-manager

border-layout