Here you can find the source of createFrame(Container content)
public static JFrame createFrame(Container content)
//package com.java2s; /*// w ww .j av a2 s . c om * Xapp (pronounced Zap!), A automatic gui tool for Java. * Copyright (C) 2009 David Webber. All Rights Reserved. * * The contents of this file may be used under the terms of the GNU Lesser * General Public License Version 2.1 or later. * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. */ import javax.swing.*; import java.awt.*; public class Main { public static ImageIcon DEFAULT_FRAME_ICON; public static JFrame createFrame(Container content) { JFrame jf = new JFrame(); jf.setContentPane(content); jf.pack(); if (DEFAULT_FRAME_ICON != null) { jf.setIconImage(DEFAULT_FRAME_ICON.getImage()); } return jf; } }