Java tutorial
//package com.java2s; /* * This file is part of WebLookAndFeel library. * * WebLookAndFeel library is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * WebLookAndFeel library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with WebLookAndFeel library. If not, see <http://www.gnu.org/licenses/>. */ import java.awt.Component; import java.awt.Container; public class Main { /** * Returns whether atleast one of child components within the specified * container is focusable or not. * * @param container * container to process * @return true if atleast one of child components within the specified * container is focusable, false otherwise */ public static boolean hasFocusableComponent(final Container container) { for (final Component component : container.getComponents()) { if (component.isFocusable()) { return true; } else if (component instanceof Container) { if (hasFocusableComponent((Container) component)) { return true; } } } return false; } }