Java Program to check a number is unique or not


In this program, You will learn how to check a number is unique or not in Java.


Some list of unique numbers is: 1, 2, 12, 23, 234

- Unique number no repeat the digit of number


Example: How to check a number is unique or not in Java

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import java.util.Scanner;

class Main {
    public static void main(String args[]) {

        int n, num, i, j, r, k = 0, flag = 1;;
        int arr[] = new int[5];
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a Number :");
        n = sc.nextInt();
        num = n;

        while (n > 0) {

            r = n % 10;
            arr[k] = r;
            n = n / 10;
            k++;
        }

        for (i = 0; i < k; i++) {
            for (j = i + 1; j < k; j++) {
                if (arr[i] == arr[j]) {
                    flag = 0;
                }
            }
        }

        if (flag == 1) {
            System.out.println("\nNumber is Unique :" + num);
        } else {
            System.out.println("\nNumber is Not Unique :" + num);
        }

    }
}

Output:

Enter a Number :123
Number is Unique :123