SpringLayout可以在Windows 7上运行，但不能在NetBSD上运行? [英] SpringLayout works on Windows 7 but not NetBSD?

问题描述

我正在使用SpringLayout使用以下代码制作GUI:

I am making a GUI using SpringLayout using the following code:

private void createAndShowGUI() {
    frame = new JFrame("A GUI");
    frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
    frame.setResizable(false);

    Container contentPane = frame.getContentPane();
    SpringLayout layout = new SpringLayout();
    contentPane.setLayout(layout);

    contentPane.add(this);
    layout.putConstraint(SpringLayout.WEST, this, 300, SpringLayout.WEST, contentPane);
    layout.putConstraint(SpringLayout.NORTH, this, 0, SpringLayout.NORTH, contentPane);

    JLabel startLabel = new JLabel("Start Node:");
    contentPane.add(startLabel);
    layout.putConstraint(SpringLayout.WEST, startLabel, 5, SpringLayout.WEST, contentPane);
    layout.putConstraint(SpringLayout.NORTH, startLabel, 5, SpringLayout.NORTH, contentPane);

    startNodes = new JComboBox();
    contentPane.add(startNodes);
    layout.putConstraint(SpringLayout.WEST, startNodes, 15, SpringLayout.WEST, contentPane); // THIS LINE
    layout.putConstraint(SpringLayout.EAST, startNodes, -10, SpringLayout.WEST, this); // AND THIS ONE
    layout.putConstraint(SpringLayout.NORTH, startNodes, 5, SpringLayout.SOUTH, startLabel);

    layout.putConstraint(SpringLayout.EAST, contentPane, 0, SpringLayout.EAST, this);
    layout.putConstraint(SpringLayout.SOUTH, contentPane, 0, SpringLayout.SOUTH, this);

    frame.pack();
    frame.setVisible(true);
}`

当我在NetBSD上运行它时，两条注释行似乎相互冲突. 当我只有第一个时，它会按预期的方式向左对齐，但是当我添加第二个时，它会向右对齐，而不是像我期望的那样向右拉伸.

When I run it (on NetBSD), the two commented lines seem to fight with each other. When I just have the first one, it aligns to the left as expected, but when I add the second one, it aligns to the right, as opposed to stretching to the right as I would expect.

奇怪的是，它可以在Windows 7 Pro 32bit上正常运行.

The weird thing is that it runs just fine on Windows 7 Pro 32bit.

有人可以告诉我我做错了什么吗?

Can anyone tell me what I am doing wrong?

推荐答案

事实证明，在Java 1.5中，始终必须在WEST/NORTH约束之前指定EAST/SOUTH约束.否则，将无法正确放置组件. 该错误已在1.6中修复，这就是为什么我在Windows计算机上没有注意到它的原因.

It turns out that in Java 1.5, you always have to specify the EAST/SOUTH constraints before the WEST/NORTH constraints. Otherwise it doesn't position the components properly. This bug is fixed in 1.6, which is why I didn't notice it on my Windows machine.

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