Java tutorial
//package com.java2s; //License from project: Apache License import java.util.ArrayList; import java.util.Map; public class Main { /** * Delete all the keys with null values of the map received * @param map Map<String, Object> map to clean */ public static void cleanMapNullValues(Map<String, Object> map) { //check map is null if (map == null) { return; } for (String key : new ArrayList<>(map.keySet())) { if (map.get(key) == null) { map.remove(key); } } } }