JAVA

In main(), ask the user to enter a number then call the three methods passing the user entered number as argument.Input Validation: Do not accept an input that is less than 0, use a do-while loop public static void factorial(int n) This method uses a for loop to print the factorial of the parameter n as shown below. Calling factorial(5) produces this output: 5 ! = 1 * 2 * 3 * 4 * 5 = 120 Note: Mathematicians define 0! = 1