Java Program to Convert Binary to Decimal

This java program converts binary number into decimal number. First, you have to enter a binary number and then convert binary number to decimal number and finally print decimal equivalent of that binary number.

Java Program to Convert Binary Number to Decimal Number

import java.util.Scanner;

public class BinaryToDecimal
{
    public static void main(String args[])
    {
        int binary, decimal=0, i=1;
        Scanner read = new Scanner(System.in);
  
        System.out.print("Enter any Binary Number : ");
        binary = read.nextInt();
        
        int bin = binary;   
        int remainder = 1;

        while(binary > 0)
        {
            remainder = binary%10;
            decimal = decimal + remainder*i;
            i = i*2;
            binary = binary/10;
        }
  
        System.out.print("Decimal Equivalent of " +bin+ " is : "+decimal);
    }
}

Output:

Enter any Binary Number : 1111
Decimal Equivalent of 1111 is : 15

Java Program to Convert Binary to Decimal Using Integer.parseInt() Method

import java.util.Scanner;
class BinaryToDecimal {
    public static void main(String args[]){
       Scanner input = new Scanner( System.in );
       System.out.print("Enter any Binary Number: ");
       String binary =input.nextLine();

       System.out.println("Decimal Equivalent of " +binary+ " is : "+Integer.parseInt(binary,2));
    }
}

Output:

Enter any Binary Number: 1101
Decimal Equivalent of 1101 is : 13