Here you can find the source of putAll(Map original, Map... others)
public static Map putAll(Map original, Map... others)
//package com.java2s; /*//from w w w.j a v a 2 s . c o m * Copyright 2010 the original author or authors. * * 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.*; public class Main { public static Map putAll(Map original, Map... others) { for (Map other : others) { original.putAll(other); } return original; } }