What is map merge in Java?

A simple solution is to iterate through the map and use put(Key,Value) once for each mapping key and value in the another Map.

Simply use HashMap. putAll(HashMap) method which copies all of the mappings from the second map to first map. As we know hashmap does not allow duplicate keys. So when we merge the maps in this way, for duplicate keys in map1 the value is overwitten by value for same key in map2 .27 Haz 2020

A simple solution is to iterate through the map and use put(Key,Value) once for each mapping key and value in the another Map.

Java HashMap merge() The Java HashMap merge() method inserts the specified key/value mapping to the hashmap if the specified key is already not present . If the specified key is already associated with a value, the method replaces the old value with the result of the specified function.

Merging two Maps in Java