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TreeSet addAll() Method in Java

Last Updated : 12 Jun, 2023

The java.util.TreeSet.addAll(Collection C) method is used to append all of the elements from the mentioned collection to the existing set. The elements are added randomly without following any specific order. 

Syntax:

boolean addAll(Collection C)

Parameters: The parameter C is a collection of any type that is to be added to the tree set. 

Return Value: The method returns true if it successfully appends the elements of the collection C to the TreeSet otherwise it returns False. 

Below programs illustrate the Java.util.TreeSet.addAll() method: 

Program 1 : Appending a tree set. 

Output:
TreeSet: [4, Geeks, To, TreeSet, Welcome]
TreeSet: [4, Geeks, Hello, To, TreeSet, Welcome, World]

Program 2 : Appending an ArrayList. 

Output:
TreeSet: [4, Geeks, To, TreeSet, Welcome]
Final TreeSet: [4, A, Computer, Geeks, Portal, To, TreeSet, Welcome]
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