Unique Digit Number in Java

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A unique digit number is a positive integer (without leading zeroes) with no duplicate digits. For example: 7, 135, 214 are all unique digit numbers, whereas 33, 3121, 300 are not unique digit numbers.

Given two positive integers m and n, where m < n, write a Java program to determine how many unique digit numbers are there in the range between m and n (both inclusive) and display them.

The input consists of two positive integers m and n where both m and n should be < 30000. You are required to display the number of unique digit numbers in the specified range along with their values in the format specified below:

Test your program for the following data and some random data.

Example 1:
INPUT:
m = 100
n = 120
OUTPUT:
THE UNIQUE DIGIT NUMBERS ARE:
102, 103, 104, 105, 106, 107, 108, 109, 120
FREQUENCY OF UNIQUE DIGIT NUMBERS: 9

Example 2:
INPUT:
m = 2505
n = 2525
OUTPUT:
THE UNIQUE DIGIT NUMBERS ARE:
2506, 2507, 2508, 2509, 2510, 2513, 2514, 2516, 2517, 2518, 2519
FREQUENCY OF UNIQUE DIGIT NUMBERS: 11

Example 3:
INPUT:
m = 2520
n = 2529
OUTPUT:
THE UNIQUE DIGIT NUMBERS ARE:
NIL
FREQUENCY OF UNIQUE DIGIT NUMBERS: 0

import java.util.Scanner;
class Unique{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.print("m = ");
        int m = Integer.parseInt(in.nextLine());
        System.out.print("n = ");
        int n = Integer.parseInt(in.nextLine());
        if(m >= n || m > 30000 || n > 30000){
            System.out.println("INVALID INPUT");
            return;
        }
        int f = 0;
        System.out.println("THE UNIQUE DIGIT NUMBERS ARE:");
        for(int i = m; i <= n; i++){
            if(isUnique(i)){
                if(f == 0)
                    System.out.print(i);
                else
                    System.out.print(", " + i);
                f++;
            }
        }
        if(f == 0)
            System.out.print("NIL");
        System.out.println("\nFREQUENCY OF UNIQUE DIGIT NUMBERS: " + f);
    }
    public static boolean isUnique(int n){
        for(int i = 0; i <= 9; i++){
            int c = 0;
            for(int j = n; j != 0; j /= 10){
                int d = j % 10;
                if(i == d)
                    c++;
            }
            if(c > 1)
                return false;
        }
        return true;
    }
}

Location: Asansol, West Bengal, India

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