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TreeSet iterator() Method in Java

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  • Difficulty Level : Easy
  • Last Updated : 26 Nov, 2018

The Java.util.TreeSet.iterator() method is used to return an iterator of the same elements as that of the TreeSet. The elements are returned in random order from what was present in the Tree set.

Syntax:

Iterator iterate_value = Tree_Set.iterator();

Parameters: The function does not take any parameter.

Return Value: The method iterates over the elements of the Tree set and returns the values(iterators).

Below program illustrates the use of Java.util.TreeSet.iterator() method:




// Java code to illustrate iterator()
import java.util.*;
import java.util.TreeSet;
  
public class TreeSetDemo {
    public static void main(String args[])
    {
        // Creating an empty TreeSet
        TreeSet<String> set = new TreeSet<String>();
  
        // Use add() method to add elements into the Set
        set.add("Welcome");
        set.add("To");
        set.add("Geeks");
        set.add("4");
        set.add("Geeks");
  
        // Displaying the TreeSet
        System.out.println("TreeSet: " + set);
  
        // Creating an iterator
        Iterator value = set.iterator();
  
        // Displaying the values after iterating through the set
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}

Output:

TreeSet: [4, Geeks, To, Welcome]
The iterator values are: 
4
Geeks
To
Welcome
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