Java please

The factorial of n (written n!) is the product of the integers between 1 and n. Thus 4! = 1*2*3*4 = 24. By definition, 0! = 1. Factorial is not defined for negative numbers.

Write a program that asks the user for a non-negative integer and computes and prints the factorial of that integer. Youll need a while loop to do most of the workthis is a lot like computing a sum, but its a product instead. And youll need to think about what should happen if the user enters 0.

Now modify your program so that it checks to see if the user entered a negative number. If so, the program should print a message saying that a nonnegative number is required and ask the user the enter another number. The program should keep doing this until the user enters a nonnegative number, after which it should compute the factorial of that number. Hint: you will need another while loop before the loop that computes the factorial. You should not need to change any of the code that computes the factorial!