Here you can find the source of isSynthUI(final MenuItemUI ui)
public static boolean isSynthUI(final MenuItemUI ui)
//package com.java2s; /*// w ww . jav a 2 s . co m * Copyright 2000-2011 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.plaf.MenuItemUI; public class Main { private static final String V6_SYNTH_UI_CLASS = "sun.swing.plaf.synth.SynthUI"; private static final String V7_SYNTH_UI_CLASS = "javax.swing.plaf.synth.SynthUI"; public static boolean isSynthUI(final MenuItemUI ui) { Class<?> aClass = ui.getClass(); while (aClass != null && aClass.getSimpleName().contains("Synth")) { final Class<?>[] interfaces = aClass.getInterfaces(); for (int i = 0, length = interfaces.length; i < length; i++) { final Class<?> anInterface = interfaces[i]; if (V6_SYNTH_UI_CLASS.equals(anInterface.getName()) || V7_SYNTH_UI_CLASS.equals(anInterface.getName())) { return true; } } aClass = aClass.getSuperclass(); } return false; } }