We can use any iterable of values as a parameter for the putall() method, such as a list, a set, or another collection.If the key is duplicate then the old key is replaced with the new value.
The hashmap.putall() method in java provides a way to copy all of the mappings from one map to another.We should note here that in case of a collision of keys between the source and target hashmaps, the entry from the source replaces the targetmap's entry.As we can see, if we try to insert two values for the same key, the second value will be stored, while the first one will be dropped.
The method copies all of the elements i.e., the mappings, from one map into another.If user wants to putall () with already existing key but with different values it can be done like this:
But if you really need to know more , make use of treeset, arraylist, vector combinations along with this.Java 8 solution using map#merge.The method copies all of the elements i.e., the mappings, from one map into another.
It will also be returned (by every proper implementation of the put (k key, v value) method):We should note that put () and putall () replace the values if there is a matching key.
The last option is to make the value as a list and collect all the values into a list for duplicate keys.with the student example, the result map will be of type map
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