Java tutorial
//package com.java2s; /* * Copyright 2010 Workplace Systems PLC (http://www.workplacesystems.com/). * * 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.Iterator; import java.util.Map; public class Main { /** Take key and value pairs from source and create map from value to key in target. */ public static <K, V> void reverse(Map<K, V> source, Map<V, K> target) { Iterator<K> i = source.keySet().iterator(); while (i.hasNext()) { K key = i.next(); V value = source.get(key); target.put(value, key); } } }