Java tutorial
//package com.java2s; import java.awt.Component; import java.awt.Dimension; public class Main { /** * Centers component <code>b</code> within component <code>a</code>. */ public static void centerComponent(Component a, Component b) { Dimension asize = a.getSize(), bsize = b.getSize(); b.setLocation((asize.width - bsize.width) / 2, (asize.height - bsize.height) / 2); } }