Here you can find the source of getGtkThemeName()
public static String getGtkThemeName()
//package com.java2s; /*/*from w w w . j av a 2s.c o m*/ * Copyright 2012 Miklos Juhasz (mjuhasz), JetBrains s.r.o. * * 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.*; import java.lang.reflect.Method; public class Main { public static String getGtkThemeName() { final LookAndFeel laf = UIManager.getLookAndFeel(); if (laf != null && "GTKLookAndFeel".equals(laf.getClass().getSimpleName())) { try { final Method method = laf.getClass().getDeclaredMethod("getGtkThemeName"); method.setAccessible(true); final Object theme = method.invoke(laf); if (theme != null) { return theme.toString(); } } catch (Exception ignored) { } } return null; } }