Programming Exercise 12.7 Write the bin2 Dec(String binaryString) method to convert a binary string (a string containing only the characters O and '1') into a decimal number. Implement the bin2Dec method to throw a NumberFormatException if the string is not a binary string. Test with the strings "10001" and "141111111". The algorithm for bin2Dec performs char arithmetic.First, initialize an int value to 0. Then, loop through the string, multiplying the current value by two, adding the character at the loop index, and subtracting 'O