What is the addAll method in set?
All() method is declared in the Set interface and is implemented in the HashSet class. It is used to add all of the elements in the specified collection to this set if they’re not already present. Definition and Usage The add() method adds an element to the set. If the element already exists, the add() method does not add the element.The . All() method is declared in the Set interface and is implemented in the HashSet class. It is used to add all of the elements in the specified collection to this set if they’re not already present.
How to use addAll?
The addAll() method adds all of the items from a collection to the list. If an index is provided then the new items will be placed at the specified index, pushing all of the following elements in the list ahead. If an index is not provided then the new items will be placed at the end of the list. The List add() method adds (appends) an element to a list. It can be used for both ArrayList and LinkedList.
What does the Addall do?
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