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Editorial Team
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Asked: 2026-05-16T10:00:36+00:00

Sample code: JFrame jFrame = new JFrame("Test"); jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); jFrame.setLocationRelativeTo(null); jFrame.setSize(600, 600); jFrame.pack(); // jFrame.setLocationRelativeTo(null);

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Sample code:

    JFrame jFrame = new JFrame("Test");
    jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    jFrame.setLocationRelativeTo(null);
    jFrame.setSize(600, 600);
    jFrame.pack();
    // jFrame.setLocationRelativeTo(null); // same results
    jFrame.setVisible(true);

screenshot

Is this the OpenJDK’s fault? I recall hearing it wasn’t as good as Sun’s, but since it became the standard for Ubuntu or whatever I decided to go along with it. The program is probably gonna run on windows, so I suppose I’m gonna have to check there… Any easy way to fix this in a platform independent way without breaking it where it already works?

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1 Answer

  1. Editorial Team

    One way is to manually position the window. Put the following code right after your call to pack().

    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Point middle = new Point(screenSize.width / 2, screenSize.height / 2);
Point newLocation = new Point(middle.x - (jFrame.getWidth() / 2), 
                              middle.y - (jFrame.getHeight() / 2));
jFrame.setLocation(newLocation);

    Disclaimer, this was only tested on windows.

    Also, you should always use setPreferredSize() instead of setSize().

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