Java tutorial
//package com.java2s; import java.awt.Dimension; import java.awt.Point; import java.awt.Toolkit; public class Main { /** * This method returns the point at which the incoming dialog will be * perfectly centered on screen. * @param windowToCenter The window to center. Make sure thesize has been set (pack or validate first). * @return The point to set on the dialog using setLocation(). */ public static Point getCenteredWindowPoint(java.awt.Window windowToCenter) { //Center the Dialog Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); Dimension frameSize = windowToCenter.getSize(); if (frameSize.height > screenSize.height) { frameSize.height = screenSize.height; } if (frameSize.width > screenSize.width) { frameSize.width = screenSize.width; } Point centerCoord = new Point((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2); return centerCoord; } }