Java tutorial
//package com.java2s; //License from project: Open Source License import java.awt.Dimension; import java.awt.Toolkit; import javax.swing.JFrame; public class Main { public static void centerFrame(JFrame frame) { Dimension dim = Toolkit.getDefaultToolkit().getScreenSize(); frame.setLocation(dim.width / 2 - frame.getSize().width / 2, dim.height / 2 - frame.getSize().height / 2); } }