Java tutorial
//package com.java2s; import java.awt.Toolkit; import java.awt.Window; public class Main { /** * Centers a {@link Window} at the center of the screen.<br/> * Windows like {@link JDialog} and {@link JFrame} (and others) that extend from {@link Window} applies for this method. * * @param window */ public static void centerWindow(Window window) { window.setLocation((Toolkit.getDefaultToolkit().getScreenSize().width) / 2 - window.getWidth() / 2, (Toolkit.getDefaultToolkit().getScreenSize().height) / 2 - window.getHeight() / 2); } }