In Java. Write a method that returns the factorial of a number. The method should take one int parameter and use a loop to compute the factorial. Remember that the factorial of a postive integer n (usually written as n!) is defined as the product of all integers from 1 up to n. For example, 4! is 4 x 3 x 2 x 1 or 24. If your method is called with a zero or negative argument, just return 1.