This method is used to retain all the elements present in the collection from the specified collection into the list.
boolean retainAll(Collection c)
Parameters: This method has only argument, collection of which elements are to be retained in the given list.
Returns: This method returns True if elements are retained and list changes.
Below programs show the implementation of this method.
[1, 3, 5, 7, 9] [3, 5]
Program 2: Below is the code to show implementation of list.retainAll() using Linkedlist.
[10, 30, 50, 70, 90] [30, 50]
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