How to check whether given number is Binary or not in Java?

Problem Description :

Write a program in Java that checks whether given number is Binary or not? Do all possible validations also.

Given number is binary or not?

Concept :

A binary number is a number that is represented using two distinct symbols 0(zero) and 1(one).

Java Program :

package com.javamultiplex.number; import java.util.Scanner; /** * * @author Rohit Agarwal * @problem Number is binary or not * */ public class BinaryNumber { public static void main(String[] args) { Scanner input = null; try { input = new Scanner(System.in); System.out.println("Enter number : "); String number = input.next(); /* * Regular expression that matches string containing only * digits[0-9]. */ String pattern1 = "^[0-9]+$"; if (number.matches(pattern1)) { /* * Regular expression that matches string containing only binary * digits[0-1]. */ String pattern2 = "^[01]+$"; if (number.matches(pattern2)) { System.out.println("It is binary."); } else { System.out.println("It is not binary."); } } else { System.out.println("Please enter valid number."); } } finally { if (input != null) { input.close(); } } } }

Output :

Case 1 :

Output - Given number is binary

Case 2 :

Output - Given number is not binary

References :

https://en.wikipedia.org/wiki/Binary_number

http://docs.oracle.com/javase/7/docs/api/java/lang/String.html

https://en.wikipedia.org/wiki/Regular_expression

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Tags : Binary numbers, Solution in Java, Regular expressions, String, if else statement.

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