Here you can find the source of isAqua()
public static boolean isAqua()
//package com.java2s; /*//from w w w .j a va 2s . c o m * Hex - a hex viewer and annotator * Copyright (C) 2009-2014 Trejkaz, Hex Project * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import javax.swing.UIManager; public class Main { /** * Tests if the look and feel is Aqua or a derivative (e.g. Quaqua.) * * @return {@code true} if using Aqua, otherwise {@code false}. */ public static boolean isAqua() { if (isQuaqua()) { return true; } Class<?> lafClass = UIManager.getLookAndFeel().getClass(); while (lafClass != null) { if ("com.apple.laf.AquaLookAndFeel".equals(lafClass.getName())) { return true; } lafClass = lafClass.getSuperclass(); } return false; } /** * Tests if the look and feel is Quaqua, which we use on Mac to get better look and feel for Mac. * * @return {@code true} if using Quaqua, otherwise {@code false}. */ public static boolean isQuaqua() { return "ch.randelshofer.quaqua.QuaquaLookAndFeel".equals(UIManager .getLookAndFeel().getClass().getName()); } }