What is Set in Java Collection and simple program

Collection -Set

Set interface includes all the methods of the Collection interface. Its because Collection is a super interface of List 

• Set does not allow duplicate elements.
•  Does not maintain insertion order

HashSet –Operations with Example 

• Create   a HashSet
• Adding elements
• Removing elements
• Changing elements
• Iterating through the HashSet

package com.example;

import java.util.HashSet;
import java.util.Iterator;

public class HashSetExample {
    public static void main(String[] args) {
        //Creating HashSet and adding elements
        HashSet<String> set=new HashSet<String>();
        set.add("Ravi");
        set.add("Vijay");
        set.add("Ravi");
        set.add("Ajay");
        System.out.println(" Hash set is"+set);
        //Removing specific element from HashSet
        set.remove("Ravi");
        System.out.println("After invoking remove(object) method: "+set);

        //Traversing elements
        Iterator<String> itr=set.iterator();
        while(itr.hasNext()){
            System.out.println("Iterator way loop print data "+itr.next());
        }

        //for each loop
        for(String str : set){
            System.out.println("For loop way print data "+str);
        }
    }
}