Hashmap Set Value Java

Mapping string values to integer keys. Then, we'll look at some additional solutions available in java 8 and above. We know that the hashset uses hashmap internally to add elements.

Hashmap extends abstractmap class and implements the map interface. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. Any changes to the map also modify the returned set and vice versa.

Now , in hashmap, you have two methods to store data, 1.

Hashmap keyset () method in java the keyset () method of hashmap returns a set of keys contained in it. Articlemapone.put ( ar02, some article ); The java hashmap values () method returns a view of all the values present in entries of the hashmap. It was introduced in the java 1.2 version and hence has been a part of the java collection library.