Java Program to Convert Binary Number to Decimal

 Example 1: Binary to Decimal Conversion Using Custom Method

class Main {

      public static void main(String[] args) {

    // binary number

    long num = 110110111;

    // call method by passing the binary number

    int decimal = convertBinaryToDecimal(num);

    System.out.println("Binary to Decimal");

    System.out.println(num + " = " + decimal);

  }

  public static int convertBinaryToDecimal(long num) {

    int decimalNumber = 0, i = 0;

    long remainder;

        while (num != 0) {

      remainder = num % 10;

      num /= 10;

      decimalNumber += remainder * Math.pow(2, i);

      ++i;

    }

        return decimalNumber;

  }

}


Example 2: Binary to Decimal Conversion Using parseInt()

class Main {

  public static void main(String[] args) {

       // binary number

    String binary = "01011011";

        // convert to decimal

    int decimal = Integer.parseInt(binary, 2);

    System.out.println(binary + " in binary = " + decimal + " in decimal.");

  }

}

Example 3: Decimal to Binary Conversion using Custom Method

class Main {

  public static void main(String[] args) {

    // decimal number

    int num = 19;

    System.out.println("Decimal to Binary");

    // call method to convert to binary

    long binary = convertDecimalToBinary(num);

    System.out.println("\n" + num + " = " + binary);

    }

  public static long convertDecimalToBinary(int n) {

    long binaryNumber = 0;

    int remainder, i = 1, step = 1;

    while (n!=0) {

      remainder = n % 2;

        System.out.println("Step " + step++ + ": " + n + "/2");

        System.out.println("Quotient = " + n/2 + ", Remainder = " + remainder);

        n /= 2;

        binaryNumber += remainder * i;

        i *= 10;

    }

        return binaryNumber;

    }

}

Example 4: Decimal to Binary Conversion using toBinaryString()

class Main {

  public static void main(String[] args) {

        // decimal number 

    int decimal = 91;

        // convert decimal to binary

    String binary = Integer.toBinaryString(decimal);

    System.out.println(decimal + " in decimal = " + binary + " in binary.");

  }

}

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