(NumberFormatException) Write the bin2Dec(String binaryString) method to convert a binary string into a decimal number. Implement the bin2Dec method to throw a NumberFormatException if the string is not a binary string.

Test the above method as part of a class with a main method for testing as shown below:

public class execption {

public static void main(String[] args) {

System.out.println(bin2Dec("10001"));

System.out.println(bin2Dec("141111111"));

}

public static int bin2Dec(String binaryString) {

...

}// end of method

}// end of class