Here you can find the source of isFile(final URL url)
public static boolean isFile(final URL url)
//package com.java2s; /*// w ww . ja v a 2 s . co m * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF 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.net.URL; public class Main { /** Constant for the file URL protocol. */ private static final String PROTOCOL_FILE = "file"; private static final String JBOSS_FILE = "vfsfile"; public static boolean isFile(final URL url) { return url != null && (url.getProtocol().equals(PROTOCOL_FILE) || url.getProtocol().equals(JBOSS_FILE)); } }