public class Main { public static void main(String[] args) { int[] nums = {1, 2, 3, 2, 4, 5, 1}; for (int i = 0; i < nums.length; i++) { for (int j = i + 1; j < nums.length; j++) { if (nums[i] == nums[j]) { System.out.println("Duplicate: " + nums[i]); } } } } }