A super class Number is defined to calculate the factorial of a number. Define a sub class Series…

A super class Number is defined to calculate the factorial of a number. Define a sub class Series to find the sum of the series $S = 1! + 2! + 3! + 4! + \dots + n!$ The details of the members of both the classes are given below: Class name : Number Data member/instance variable: n : to store an integer number Member functions/methods: Number(int nn) : parameterized constructor to initialize the data member n=nn int factorial(int a) : returns the factorial of a number (factorial of $n = 1 \times 2 \times 3 \times \dots \times n$) void display( ) : displays the data members Class name: Series Data member/instance variable: sum : to store the sum of the series Member functions/methods: Series(…) : parameterized constructor to initialize the data members of both the classes void calsum( ) : calculates the sum of the given series void display( ) : displays the data members of both the classes Assume that the super class Number has been defined. Using the concept of inheritance, specify the class Series giving the details of the constructor(…),void calsum( ) and void display( ). The super class, main function and algorithm need NOT be written.

class Series extends Number
{
    long sum;

    Series(int nn)
    {
        super(nn);
        sum = 0;
    }

    void calsum()
    {
        sum = 0;
        for (int i = 1; i <= n; i++)
            sum = sum + factorial(i);
    }

    void display()
    {
        super.display();
        System.out.println("Sum of the series = " + sum);
    }
}