Here you can find the source of isDarkLnf()
public static boolean isDarkLnf()
//package com.java2s; /*//from w w w .j av a 2 s . co m * Copyright 2004 - 2013 Wayne Grant * 2013 - 2018 Kai Kramer * * This file is part of KeyStore Explorer. * * KeyStore Explorer 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. * * KeyStore Explorer 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 KeyStore Explorer. If not, see <http://www.gnu.org/licenses/>. */ import javax.swing.UIManager; public class Main { private static final String DARCULA_LAF_CLASS = "com.bulenkov.darcula.DarculaLaf"; /** * Does the currently active l&f use a dark color scheme? */ public static boolean isDarkLnf() { return UIManager.getLookAndFeel().getClass().getName().equals(DARCULA_LAF_CLASS); } }