Pull Distinct Values from an Array in Java

To pull distinct values in an array you need to compare each element of the array to all the remaining elements, in case of a match you got your duplicate element. One solution to do so you need to use two loops (nested) where the inner loop starts with i+1 (where i is the variable of outer loop) to avoid repetitions in comparison.

Example

 Live Demo

import java.util.Arrays;
import java.util.Scanner;

public class DetectDuplcate {
   public static void main(String args[]) {
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter the size of the array that is to be created::");
      int size = sc.nextInt();
      int[] myArray = new int[size];
      System.out.println("Enter the elements of the array ::");

      for(int i=0; i<size; i++) {
         myArray[i] = sc.nextInt();
      }
      System.out.println("The array created is ::"+Arrays.toString(myArray));
      System.out.println("indices of the duplicate elements :: ");
 
      for(int i=0; i<myArray.length; i++) {
         for (int j=i+1; j<myArray.length; j++) {
            if(myArray[i] == myArray[j]) {
               System.out.println(j);
            }
         }
      }
   }
}

Output

Enter the size of the array that is to be created ::
6
Enter the elements of the array ::
87
52
87
63
41
63
The array created is :: [87, 52, 87, 63, 41, 63] indices of the duplicate elements ::
2
5