Web Reference: Aug 6, 2025 · The retainAll () method of ArrayList class in Java is used to retain only the elements in the list that are contained in the specified collection. It removes all elements from the list that are not in the specified collection. Definition and Usage The retainAll() method removes all items from a list which do not belong to a specified collection. The retainAll()method takes a single parameter. 1. collection -only those elements present in collectionare retained in the arraylist.
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