Java tutorial
//package com.java2s; import java.awt.Dimension; import java.awt.Toolkit; import javax.swing.JFrame; public class Main { /** * Position in center a JFrame * * @param jFrame */ public static void center(JFrame jFrame) { Toolkit tk = Toolkit.getDefaultToolkit(); Dimension screenSize = tk.getScreenSize(); jFrame.setLocation((screenSize.width - jFrame.getSize().width) / 2, (screenSize.height - jFrame.getSize().height) / 2); } }