Java tutorial
//package com.java2s; //License from project: Open Source License import java.awt.Dimension; import java.awt.Toolkit; import java.awt.Window; public class Main { public static void centerOnScreen(final Window window) { final Dimension screensize = Toolkit.getDefaultToolkit().getScreenSize(); final Dimension windowSize = window.getSize(); final int x = (screensize.width - windowSize.width) / 2; final int y = (screensize.height - windowSize.height) / 2; window.setLocation(x, y); } }