Static Methods

public class MathUtils {
    static int square(int n) { return n * n; }
    static int cube(int n)   { return n * n * n; }
    public static void main(String[] args) {
        System.out.println("Square of 7: " + square(7));
        System.out.println("Cube of 3: "   + cube(3));
    }
}