Java tutorial
//package com.java2s; /* * www.javagl.de - Swing Task Utilities * * Copyright (c) 2013-2015 Marco Hutter - http://www.javagl.de * * Permission is hereby granted, free of charge, to any person * obtaining a copy of this software and associated documentation * files (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, * copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following * conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ import java.awt.Frame; import java.awt.Window; import javax.swing.JFrame; public class Main { /** * Utility method that finds the first focused frame. If no frame * is focused, then the first visible frame will be returned. * If no frame is visible, then the first frame created by this * application will be returned. If no frame was created yet, * then <code>null</code> will be returned. * * @return The potential parent window for a dialog */ static Window findParentWindow() { Frame frames[] = JFrame.getFrames(); if (frames.length == 0) { return null; } for (Frame f : frames) { if (f.isFocused()) { return f; } } for (Frame f : frames) { if (f.isShowing()) { return f; } } return frames[0]; } }