Java tutorial
//package com.java2s; /* * Copyright 2002-2016 Jalal Kiswani. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.awt.Container; import javax.swing.JComponent; import javax.swing.JFrame; public class Main { /** * i seperated it in different method to avoid affecting other components. * * @param comp * the comp */ public static void packJFrameWindow(final JComponent comp) { if (comp.getRootPane() != null) { final Container cont = comp.getRootPane().getParent(); if (cont instanceof JFrame) { ((JFrame) cont).pack(); ((JFrame) cont).setLocationRelativeTo(null); } } } }