Java tutorial
//package com.java2s; //License from project: Open Source License import java.awt.Window; public class Main { public static void centralizeWindow(Window window) { int windowWidth = window.getWidth(); int windowHeight = window.getHeight(); int screenWidth = (int) java.awt.Toolkit.getDefaultToolkit().getScreenSize().getWidth(); int screenHeight = (int) java.awt.Toolkit.getDefaultToolkit().getScreenSize().getHeight(); window.setBounds(screenWidth / 2 - windowWidth / 2, screenHeight / 2 - windowHeight / 2, windowWidth, windowHeight); } }