Question:
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); }` 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.
The weird thing is that it runs just fine on Windows 7 Pro 32bit.
Can anyone tell me what I am doing wrong?
Solution:1
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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