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 : 
