The containsAll() method of Java HashSet is used to check whether two sets contain the same elements or not. It takes one set as a parameter and returns True if all of the elements of this set is present in the other set.
public boolean containsAll(Collection C)
Parameters: The parameter C is a Collection. This parameter refers to the set whose elements occurrence is needed to be checked in this set.
Return Value: The method returns True if this set contains all the elements of other set otherwise it returns False.
Below programs illustrate the HashSet.containsAll() method:
HashSet 1: [Geeks, for, 20, 10] HashSet 2: [Geeks, for, 20, 10] Does set 1 contains set 2: true
HashSet 1: [Geeks, for] HashSet 2: [20, 10] Does set 1 contains set 2: false
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