Write a Java program which uses the concept of function to write the following function

1. a function named area to calculate the surface area of a sphere

area = 4 x 3.14 x radius x radius

2.Write statements that assign random integers to the variable n in the following ranges: Use the random function to generate the numbers. Put the statements in a Java Program and run it.

1. a) 1 n 51
2. b) 1 n 900
3. c) 0 n 391
4. d) 1000 n 5127
5. e) 17 n 22