Here you can find the source of isJavaLibrary(JarEntry entry)
public static boolean isJavaLibrary(JarEntry entry)
//package com.java2s; /*/* www. j a v a2s .c om*/ * Licensed to the Indoqa Software Design und Beratung GmbH (Indoqa) under * one or more contributor license agreements. See the NOTICE file distributed * with this work for additional information regarding copyright ownership. * Indoqa licenses this file to You 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 java.util.jar.JarEntry; public class Main { public static boolean isJavaLibrary(JarEntry entry) { return entry.getName().toLowerCase().endsWith(".jar") || entry.getName().toLowerCase().endsWith(".zip"); } }