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I'm developing a game called GalaxyWar, and I am trying to make a map selection menu. I found a problem that when I am using a BoxLayout with BoxLayout.Y_AXIS on a JPanel with setAlignmentX(CENTER_ALIGNMENT), the subcomponents (JPanel's) with assigned size, take up the entire height of the panel (all together), instead of the assigned height!

Here is my code:

scrollPane = new JScrollPane();
    scrollPane.setBounds(160, 11, 452, 307);
    add(scrollPane);

    mapContainer = new JPanel();
    mapContainer.setAlignmentX(CENTER_ALIGNMENT);
    mapContainer.setAlignmentY(JPanel.TOP_ALIGNMENT);
    mapContainer.setLayout(new BoxLayout(mapContainer, BoxLayout.Y_AXIS));
    scrollPane.setViewportView(mapContainer);

    JPanel demoPanel = new JPanel();
    demoPanel.setLayout(null);
    demoPanel.setBackground(Color.YELLOW);
    demoPanel.setSize(50, 100);
    mapContainer.add(demoPanel);

I've researched on this for long, but couldn't find any solutions so far.

Amal Murali
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Victor2748
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    1) `scrollPane.setBounds(160, 11, 452, 307);` What is that supposed to achieve? Java GUIs might have to work on a number of platforms, on different screen resolutions & using different PLAFs. As such they are not conducive to exact placement of components. To organize the components for a robust GUI, instead use layout managers, or [combinations of them](http://stackoverflow.com/a/5630271/418556), along with layout padding & borders for [white space](http://stackoverflow.com/q/17874717/418556). .. (cont) – Andrew Thompson May 28 '14 at 00:58
  • .. (cont) 2) `demoPanel.setSize(50, 100);` See [Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing?](http://stackoverflow.com/q/7229226/418556) (Yes.) 3) For better help sooner, post an [MCVE](http://stackoverflow.com/help/mcve) (Minimal Complete and Verifiable Example). – Andrew Thompson May 28 '14 at 00:59
  • My scrollPane is placed on another JPanel with absolute layout, thats why I used .setBounds() method! – Victor2748 May 28 '14 at 01:12
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    *"My scrollPane is placed on another JPanel with absolute layout"* Then they both need fixing (as opposed to justifying). – Andrew Thompson May 28 '14 at 01:21
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    `I Researched alot of websites, finding no help,` - all the websites recommend that you should NOT use a null layout. – camickr May 28 '14 at 01:44
  • Also, review the relevant section of the tutorial, cited [here](http://stackoverflow.com/a/18805146/230513). – trashgod May 28 '14 at 05:04

1 Answers1

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try to check out

setPreferredSize() 
setMaximumSize()
setMinimumSize()

set all 3 to the same value.

If it still doesn't work, you can try to put the panel, of which you are trying to set the size to fixed, inside another panel.

Hiten Naresh Vasnani
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  • See [Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing?](http://stackoverflow.com/q/7229226/418556) (Yes.) – Andrew Thompson May 28 '14 at 10:26