Swing GridBagLayout锚点在窗口之外

我在Swing中玩 GridBagLayout ，我注意到左边的锚点是正确的，但顶部的锚点是-60像素 . 我知道窗户的确切尺寸，960x640 . 我正在制作两个列：一个在左侧有两个面板（网格高度为两个面板为2），另一个在右侧有三个面板（网格高度为1,2和1） . 这是代码：

gameFrame.setLayout(new GridBagLayout());

    GridBagConstraints constraints = new GridBagConstraints();
    constraints.anchor = GridBagConstraints.NORTHWEST;

    InfoPanel infoPanel = new InfoPanel();
    infoPanel.setPreferredSize(new Dimension(320, 320));
    infoPanel.setMinimumSize(new Dimension(320, 320));
    infoPanel.setMaximumSize(new Dimension(320, 320));
    infoPanel.setBackground(Color.BLUE);
    constraints.gridx = 0;
    constraints.gridy = 0;
    //constraints.gridwidth = 1;
    constraints.gridheight = 2;

    gameFrame.add(infoPanel, constraints);


    InfoPanel infoPanel2 = new InfoPanel();
    infoPanel2.setPreferredSize(new Dimension(320, 320));
    infoPanel2.setMinimumSize(new Dimension(320, 320));
    infoPanel2.setMaximumSize(new Dimension(320, 320));
    infoPanel2.setBackground(Color.RED);
    constraints.gridx = 0;
    constraints.gridy = 2;
    //constraints.gridwidth = 1;
    constraints.gridheight = 2;

    gameFrame.add(infoPanel2, constraints);


    InfoPanel infoPanel3 = new InfoPanel();
    infoPanel3.setPreferredSize(new Dimension(640, 200));
    infoPanel3.setMinimumSize(new Dimension(640, 200));
    infoPanel3.setMaximumSize(new Dimension(640, 200));
    infoPanel3.setBackground(Color.GREEN);
    constraints.gridx = 1;
    constraints.gridy = 0;
    //constraints.gridwidth = 1;
    constraints.gridheight = 1;

    gameFrame.add(infoPanel3, constraints);


    InfoPanel infoPanel4 = new InfoPanel();
    infoPanel4.setPreferredSize(new Dimension(640, 240));
    infoPanel4.setMinimumSize(new Dimension(640, 240));
    infoPanel4.setMaximumSize(new Dimension(640, 240));
    infoPanel4.setBackground(Color.YELLOW);
    constraints.gridx = 1;
    constraints.gridy = 1;
    //constraints.gridwidth = 1;
    constraints.gridheight = 2;

    gameFrame.add(infoPanel4, constraints);


    InfoPanel infoPanel5 = new InfoPanel();
    infoPanel5.setPreferredSize(new Dimension(640, 200));
    infoPanel5.setMinimumSize(new Dimension(640, 200));
    infoPanel5.setMaximumSize(new Dimension(640, 200));
    infoPanel5.setBackground(Color.PINK);
    constraints.gridx = 1;
    constraints.gridy = 3;
    //constraints.gridwidth = 1;
    //constraints.gridheight = 1;

    gameFrame.add(infoPanel5, constraints);

    gameFrame.pack();
    gameFrame.setLocationRelativeTo(null);

我很欣赏代码不干净，它不是它的样子，我只是想确保我能得到我需要先工作的布局 .

结果如下：

因为布局开始将对象放在顶部-60像素处，所以底部有60像素的间隙 .

有没有人遇到这样的事情？这令我感到困惑 .