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Java HashSet iterator() Method with Example

HashSet Class iterator() method: Here, we are going to learn about the iterator() method of HashSet Class with its syntax and example.
Submitted by Preeti Jain, on March 05, 2020

HashSet Class iterator() method

• iterator() method is available in java.util package.
• iterator() method is used to iterate all the elements that exist in this HashSet by using iterator () method.
• iterator() method is a non-static method, it is accessible with the class object only, and if we try to access the method with the class name then we will get an error.
• iterator() method does not throw an exception at the time of iterating HashSet elements.

Syntax:

    public Iterator iterator();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is Iterator, it returns an Iterator over the objects exist in this HashSet.

Example:

// Java program to demonstrate the example 
// of Iterator iterator () method of HashSet 

import java.util.*;

public class IteratorOfHashSet {
    public static void main(String[] args) {
        // Instantiates a HashSet object
        HashSet < String > hs = new HashSet < String > ();

        // By using add() method is to add
        // the given object of this
        // HashSet 
        hs.add("C");
        hs.add("C++");
        hs.add("JAVA");
        hs.add("PHP");
        hs.add("SFDC");

        // Display HashSet
        System.out.println("HashSet: " + hs);

        // By using iterator() method is to
        // iterate the HashSet elements in an
        // increasing order
        System.out.println("hs.iterator(): ");
        for (Iterator itr = hs.iterator(); itr.hasNext();)
            System.out.println(itr.next());
    }
}

Output

HashSet: [JAVA, C++, C, SFDC, PHP]
hs.iterator(): 
JAVA
C++
C
SFDC
PHP