java factorial loop

In Java, you can use a loop to calculate the factorial of a number. A factorial is the product of an integer and all the integers below it; for example, the factorial of 4 is 4 * 3 * 2 * 1 = 24.

Here's an example of how to use a loop to calculate the factorial of a number in Java:

public class Main {
    public static void main(String[] args) {
        int num = 4;
        int factorial = 1;
        for (int i = 1; i <= num; i++) {
            factorial *= i;
        }
        System.out.println(factorial); // 24
    }
}

In this example, a for loop is used to iterate over the integers from 1 to num. The loop variable i is initialized to 1 and is incremented by 1 on each iteration until it reaches num. The factorial is calculated by multiplying i by the current value of factorial on each iteration.

This code will calculate the factorial of 4 and print the result to the console. You can use a loop to calculate the factorial of any number in Java.