How to set JFrame to appear centered, regardless of monitor resolution?

java swing jframe position
AmateurProgrammer picture AmateurProgrammer · Mar 14, 2010 · Viewed 299.1k times · Source

While working with Java, I find it hard to position my main window in the center of the screen when I start the application.

Is there any way I can do that? It doesn't have to be vertically centered, horizontal alignment is the more important goal for me. But vertical alignment is also welcome.

Answer

JRL picture JRL · Mar 14, 2010

Use setLocationRelativeTo(null)

This method has a special effect when you pass it a null. According to the Javadoc:

If the component is null, or the GraphicsConfiguration associated with this component is null, the window is placed in the center of the screen.

This should be done after setting the size or calling pack(), but before setting it visible, like this:

frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);

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