Java Program To Check Fascinating Number

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import java.util.*;

public class JavaFascinatingNumber {

	boolean isUnique(String q) {
		int A[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; // to store frequency of
													// every digit from '0' to
													// '9'
		int i, flag = 0;
		char ch;
		for (i = 0; i < q.length(); i++) {
			ch = q.charAt(i);
			A[ch - 48]++;
		}

		for (i = 1; i < 10; i++) {
			if (A[i] != 1) {
				flag = 1; // flag is set to 1 if frequency is not 1
				break;
			}
		}

		if (flag == 1)
			return false;
		else
			return true;
	}

	public static void main(String args[]) {
		Scanner scanner = new Scanner(System.in);
		JavaFascinatingNumber ob = new JavaFascinatingNumber();

		System.out.print("Enter a number : ");
		int n = scanner.nextInt();
		String p = Integer.toString(n); // converting the number to String

		if (p.length() < 3)
			System.out.println("Number should be of atleast 3 digits.");

		else {
			String s = Integer.toString(n * 1) + Integer.toString(n * 2) + Integer.toString(n * 3);
			/*
			 * Joining the first, second and third multiple of the number by
			 * converting them to Strings and concatenating them
			 */
			if (ob.isUnique(s))
				System.out.println(n + " is a Fascinating Number.");
			else
				System.out.println(n + " is not a Fascinating Number.");
		}
	}
}

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