Java HashMap Create getHashMapFromMap( Map map, K key)

Description

get Hash Map From Map

License

Open Source License

Declaration

@SuppressWarnings("unchecked")
    public static <A, B, K, V extends Map<A, B>> Map<A, B> getHashMapFromMap(
            Map<K, V> map, K key) 

Method Source Code

//package com.java2s;
/* //  ww  w .j  a  v  a2 s  . com
 * Sourcerer: an infrastructure for large-scale source code analysis.
 * Copyright (C) by contributors. See CONTRIBUTORS.txt for full list.
 *
 * This program 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.

 * This program 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.HashMap;

import java.util.Map;

public class Main {
    @SuppressWarnings("unchecked")
    public static <A, B, K, V extends Map<A, B>> Map<A, B> getHashMapFromMap(
            Map<K, V> map, K key) {
        Map<A, B> value = map.get(key);
        if (value == null) {
            value = new HashMap<>();
            map.put(key, (V) value);
        }
        return value;
    }
}

Related

1. getHashMap()
2. getHashMap()
3. getHashMap()
4. getHashMap(Object... args)
5. getHashMapFromArrayList( ArrayList lines, int keyIndex)
6. hashMap()
7. hashMap()
8. hashmap()
9. hashMap(Entry... entries)