Here you can find the source of putAll(Map
public static void putAll(Map<String, String> map, String prefix, Map<String, String> values)
//package com.java2s; /******************************************************************************* * Copyright (c) 2014, 2015 Scott Clarke (scott@dawg6.com). * * This file is part of Dawg6's Demon Hunter DPS Calculator. * * Dawg6's Demon Hunter DPS Calculator is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version.//from ww w. j a va2s. c om * * Dawg6's Demon Hunter DPS Calculator is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. *******************************************************************************/ import java.util.Map; public class Main { public static void putAll(Map<String, String> map, String prefix, Map<String, String> values) { for (Map.Entry<String, String> e : values.entrySet()) { map.put(prefix + e.getKey(), e.getValue()); } } }