public class MaximumApp {
    public static void main(String[] args) {

        int a,
                b,
                c,
                d;
        a = -10;
        b = 100;
        c = 20;
        d = 521;

        int newMaxNumber = max(a, b);
        System.out.println(newMaxNumber);
        newMaxNumber = max(a, b, c);
        System.out.println(newMaxNumber);
        newMaxNumber = max(a, b, c, d);
        System.out.println(newMaxNumber);
    }

    private static int max(int a, int b) {
        /**
         * This method describes the determination of the maximum
         * value among the variables passed to the method parameters.
         *
         * @param a  variable of type Integer, it can be positive and negative values
         * @param b  variable of type Integer, it can be positive and negative values
         * @return variable of type Integer, maximum value of 2 parameters
         */
        return (a > b) ? a : b;
    }

    private static int max(int a, int b, int c) {
        /**
         * This method describes the determination of the maximum
         * value among the variables passed to the method parameters.
         *
         * @param a  variable of type Integer, it can be positive and negative values
         * @param b  variable of type Integer, it can be positive and negative values
         * @param c  variable of type Integer, it can be positive and negative values
         * @return variable of type Integer, maximum value of 3 parameters
         */
        int newCheckNumb;
        newCheckNumb = max(a, b);
        return (newCheckNumb > c) ? newCheckNumb : c;
    }

    private static  int max(int a, int b, int c, int d) {
        /**
         * This method describes the determination of the maximum
         * value among the variables passed to the method parameters.
         *
         * @param a  variable of type Integer, it can be positive and negative values
         * @param b  variable of type Integer, it can be positive and negative values
         * @param c  variable of type Integer, it can be positive and negative values
         * @param d  variable of type Integer, it can be positive and negative values
         * @return variable of type Integer, maximum value of 4 parameters
         */
        int newCheckNumb;
        newCheckNumb = max(a, b, c);
        return (newCheckNumb > d) ? newCheckNumb : d;
    }
}