Inverts the given Map , assuming a one-to-one key-value correspondence. - Java java.util

Java examples for java.util:Map Key

  1. HOME
  2. Java
  3. java.util
  4. Map Key

Description

Inverts the given Map , assuming a one-to-one key-value correspondence.

Demo Code

/*//  w w  w.j a va  2  s . co  m
 * Copyright (C) 2012 Clarion Media, LLC
 * 
 * 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.
 */
//package com.book2s;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

public class Main {
    /**
     * Inverts the given {@link Map}, assuming a one-to-one key-value
     * correspondence.
     * 
     * @param map
     *            the {@code Map} to invert
     * @return inverted {@code Map}
     */
    public static <K, V> Map<V, K> invert(Map<K, V> map) {
        Map<V, K> inv = new HashMap<V, K>();
        for (Entry<K, V> entry : map.entrySet())
            inv.put(entry.getValue(), entry.getKey());
        return inv;
    }
}

Related Tutorials