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How to convert an Array into a Set in Java ?.

Program to demonstrate how to convert an Array into a Set in Java.

package com.hubberspot.examples;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

public class ArrayToSet {

 public static void main(String[] args) {

  // 1. Creating an array of duplicate integers
  Integer[] array = { 1,2,3,3,2,1,4,5,6,6,5,4,3,2,1,8,9,10 };

  // 2. Printing the elements of array on console
  System.out.println("Elements in Array are : ");

  for(int i = 0; i < array.length; i++) {

   System.out.print(array[i] + " ");

  }

  // 3. Converting array of integers to List by using
  // java.util.Arrays static method asList(). It takes
  // in the object of array and returns us back with
  // a backed list
  List list = Arrays.asList(array);

  // 4. Creating a Set object by passing it 
  // elements of List. Set discards duplicate values
  // if tried to inserted into it. 
  Set set = new HashSet(list);

  // 5. Creating an Iterator object from Set 
  // by calling iterator() method of Set
  Iterator iterator = set.iterator();
  System.out.println();
  System.out.println("Elements in Set are : ");

  // Looping each element in the Set using
  // iterator and printing the Set conatining
  // no duplicate values.
  while(iterator.hasNext()) {

   Object i = iterator.next();
   System.out.print(i + " ");

  }

 }

}


Output of the program : 

 
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