Prime numbers. Write a program that prompts the user for an integer and then prints out all prime numbers up to that integer. For example, when the user enters 20, the program should print:

2357 11 13 17 19 Recall that a number is a prime number if it is not divisible by any number except 1 and itself.
Use a class PrimeGenerator with methods nextPrime and isPrime. Supply a class Prime-
Printer whose main method reads a user input, constructs a Prime Generator object, and prints the primes.