Java tutorial
//package com.java2s; //License from project: Apache License import java.awt.Dimension; import java.awt.Toolkit; import java.awt.Window; public class Main { public static void center(Window window) { final Dimension size = window.getSize(); final Dimension screen = Toolkit.getDefaultToolkit().getScreenSize(); final int locX = (screen.width - size.width) / 2; final int locY = (screen.height - size.height) / 2; window.setLocation(locX, locY); } }