Java Map Remove removeNullEntries(Map map)

Description

Returns a new map with all entries of the input map except those which have a value of null.

License

Open Source License

Parameter

Parameter	Description
A	the key type of the map
B	the value type of the map
map	the input map

Return

a map with all null entries removed

Declaration

public static <A, B> Map<A, B> removeNullEntries(Map<A, B> map) 

Method Source Code

//package com.java2s;
/*/* w w w. j av a2 s. co m*/
 * This library is part of Geranium -
 * an open source UI library for GWT.
 *
 * Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)-
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * For further information about Alkacon Software, please see the
 * company website: http://www.alkacon.com
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

import java.util.HashMap;

import java.util.Map;

public class Main {
    /**
     * Returns a new map with all entries of the input map except those which have a value of null.<p>
     * 
     * @param <A> the key type of the map
     * @param <B> the value type of the map 
     * @param map the input map
     *  
     * @return a map with all null entries removed 
     */
    public static <A, B> Map<A, B> removeNullEntries(Map<A, B> map) {

        HashMap<A, B> result = new HashMap<A, B>();

        for (Map.Entry<A, B> entry : map.entrySet()) {
            if (entry.getValue() != null) {
                result.put(entry.getKey(), entry.getValue());
            }
        }
        return result;
    }
}

Related

1. removeKeys(Collection keys, Map map)
2. removeKeysWithPrefix(Map map, String prefix)
3. removeMapEntryFromPreferenceStoredMap(String keyOfPreference, String keyInMap)
4. removeNamespaces(Map properties)
5. removeNode(Map map, List pathItems)
6. removeNullPair(Map map)
7. removeNullValues(final Map parameters)
8. removeNullValues(Map map)
9. removeObject(Map map, T key)