Here you can find the source of mergeEnv(Map
private static void mergeEnv(Map<String, Object> newEnv, Map<String, ?> env)
//package com.java2s; /*/* ww w. ja v a 2s . co m*/ * Copyright 2016 peter. * * 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.util.Map; public class Main { private static void mergeEnv(Map<String, Object> newEnv, Map<String, ?> env) { if (env != null) { // Some maps are not equal, so we can't use putAll env.forEach((k, v) -> newEnv.put(k, v)); //newEnv.putAll( env ); } } }