Different ways to Iterate Set

Published May 18, 2022

In Java, a set is used to build collections that use hash tables to store data. Sets store information through a mechanism known as hashing. As a result of hashing, the informational content of a key determines its unique value, called its hash code.

There are two common ways you can use to iterate over a hash set in Java:

Using an Iterator method
Without using the Iterator method

Using Iterator method

In this example, we are going to create a Set using the HashSet class and use the iterator() method to iterate over the set.

Example

import java.util.HashSet;

import java.util.Iterator;

public class Iterate_set_using_iterators {

public static void main(String[] args) {

HashSet<String> hashmanset = new HashSet<String>();

hashmanset.add("Python");

hashmanset.add("Kotlin");

hashmanset.add("Java");

Iterator<String> a = hashmanset.iterator();

while(a.hasNext()){

System.out.println(a.next());

}

Output

Java

Python

Kotlin

Without Using the Iterator method

In this example, we have not used an iterator, however, we have used the for-each method to iterate each element of a set

import java.util.HashSet;

import java.util.Set;

public class Iterate_set_Without_Using_Iterator_method {

public static void main(String[] args) {

Set<String> hset = new HashSet<String>();

hset.add("Python");

hset.add("java");

hset.add("Kotlin");

for (String temp : hset) {

System.out.println(temp);

}

Output

java

Python

Kotlin

Keyword: How to Iterate over a Set , List Iterator, Set Iterator

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