Use the addAll() method to merge two LinkedHashSet objects or append elements of one LinkedHashSet object to another LinkedHashSet object. Comparing with the set, addAll() method is used as Union. The addAll method adds all the elements of the specified collection to this set object.
Input : List1 = [1,2,3], List2 = [3, 4, 5] Output: [1, 2, 3, 4, 5] Input : List1 = ['a', 'b', 'c'], List2 = ['d'] Output: ['a', 'b', 'c', 'd']
boolean addAll(Collection<? extends E> collection)
Parameters: This is the collection containing elements to be added to this list.
Merged LinkedHashSet: [yellow, white, black, red, green]
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