Java Map Merge mergeMaps(Map map1, Map map2)

Description

Returns a new map with all the entries of map1 and any from map2 which don't override map1.

License

Apache License

Declaration

public static <K, V> Map<K, V> mergeMaps(Map<K, V> map1, Map<K, V> map2) 

Method Source Code

//package com.java2s;
/*//from   w  ww  .j ava  2 s .co  m
 * Copyright 2016 Red Hat, Inc.
 *
 * Red Hat licenses this file to you 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.HashMap;
import java.util.Map;

public class Main {
    /**
     * Returns a new map with all the entries of map1 and any from map2 which don't override map1.
     *
     * Can handle either maps being null. Always returns a new mutable map
     */
    public static <K, V> Map<K, V> mergeMaps(Map<K, V> map1, Map<K, V> map2) {
        Map<K, V> answer = new HashMap<>();
        if (map2 != null) {
            answer.putAll(map2);
        }
        if (map1 != null) {
            answer.putAll(map1);
        }
        return answer;

    }
}

Related

1. mergeMaps(Map m1, Map m2)
2. mergeMaps(Map mainMap, Map defaultMap, String[] keys, boolean enforceValues)
3. mergeMaps(Map dest, Map inserts)
4. mergeMaps(Map into, Map from, boolean override)
5. mergeMaps(Map m1, Map m2)
6. mergeMaps(Map defaultMap, Map customMap)
7. mergeMaps(Map destination, Map source)
8. mergeMaps(Map map1, Map map2)
9. mergeMapsIgnoreDuplicateKeys( Map first, Map second)