Here you can find the source of isDefaultLookAndFeel()
public static boolean isDefaultLookAndFeel()
//package com.java2s; /*//from www.j av a 2s . c o m * Copyright 2014 dorkbox, llc * * 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 javax.swing.UIManager; public class Main { /** * @return true if the System is configured to use the System L&F. False otherwise */ public static boolean isDefaultLookAndFeel() { return UIManager.getLookAndFeel().getClass().getName().equals(UIManager.getSystemLookAndFeelClassName()); } }