Here you can find the source of putMap(Map target, Map
@SuppressWarnings({ "unchecked", "rawtypes" }) public static <K, V> void putMap(Map target, Map<K, V> map)
//package com.java2s; /*//from w ww. j a v a 2 s . c om * Copyright 2014 Bernd Vogt and others. * * 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; import java.util.Map.Entry; public class Main { @SuppressWarnings({ "unchecked", "rawtypes" }) public static <K, V> void putMap(Map/* <String, String> */ target, Map<K, V> map) { for (Entry<K, V> entry : map.entrySet()) { target.put(entry.getKey().toString(), entry.getValue().toString()); } } }