Here you can find the source of getResourceAsStream(final String path)
static InputStream getResourceAsStream(final String path) throws IOException
//package com.java2s; /*// www. j a v a 2s. c om * Copyright 2017 TFA Hub Team * * 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 java.io.IOException; import java.io.InputStream; import java.net.URL; public class Main { static InputStream getResourceAsStream(final String path) throws IOException { final URL resource = getResource(path); if (resource == null) { throw new IllegalStateException(path); } return resource.openStream(); } static URL getResource(final String path) throws IOException { return Thread.currentThread().getContextClassLoader().getResource(path); } }