How to convert Binary number to Decimal number in Java?

Problem Description :

Write a program in java that converts Binary number to Decimal number.

Java program that converts binary number to decimal number.

Binary to Decimal conversion

Concept :

Click here to learn how to convert binary number to decimal number Mathematically. We are using Method 1 : Using Positional Notation.

Java Program :

package com.javamultiplex.baseconversion; import java.util.Scanner; /** * * @author Rohit Agarwal * @category Base Conversion * @problem Convert Binary to Decimal * */ public class BinaryToDecimal { public static void main(String[] args) { Scanner input = null; try { input = new Scanner(System.in); System.out.println("Enter binary number : "); String number = input.next(); if (isBinaryNumber(number)) { int decimal = getDecimalNumber(number); System.out.println("Decimal Number : " + decimal); } else { System.out.println("Please enter valid binary number."); } } finally { if (input != null) { input.close(); } } } private static int getDecimalNumber(String number) { // Converting String to StringBuilder. StringBuilder string = new StringBuilder(number); string = string.reverse(); int length = string.length(); int digit, power, sum = 0; for (int i = 0; i < length; i++) { digit = string.charAt(i) - 48; power = (int) Math.pow(2, i); sum = sum + digit * power; } return sum; } private static boolean isBinaryNumber(String number) { /* * Regular expression that matches string containing only binary * digits[0-1]. */ String pattern = "^[01]+$"; boolean result = false; if (number.matches(pattern)) { result = true; } return result; } }

Output :

Output - How to convert Binary number to Decimal number in Java?

References :

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

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

https://docs.oracle.com/javase/7/docs/api/java/lang/StringBuilder.html

Thank you friends, I hope you have clearly understood the solution of this problem. If you have any doubt, suggestion or query please feel free to comment below. You can also discuss this solution in our forum.

Tags : Conversion problems, Binary to Decimal, Solution in Java, String, StringBuilder, Regular expressions, if else statement, for loop.

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How to convert Binary number to Decimal number in Java?

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