Question

suggest a business application that employs inheritance. Predict the classes and subclasses that may be involved and support your prediction.

Answer 1

So let's create superclass BusinessCompany that has two instance variables: name, numOfWorkers and one method profit(...):

class BusinessCompany {
    String name;
    int numOfWorkers;
    public double profit(double x) {
        double m = Math.pow(x, 2);
        return m;
    }
}

Let's create three subclasses: Company1, Company2, Company3. These three classes have their names, number of workers and functions of profit growth. Company1 and Company 3 have equal functions of profit growth: $x^2$ (such as BusinessCompany), for example, let's $x$ – number of orders:

So Company1:

class Company1 extends BusinessCompany {
    String name = "Adaptec";
    int numOfWorkers = 143;
}

Company3:

class Company3 extends BusinessCompany {
    String name = "Adobe Systems";
    int numOfWorkers = 1175;
}

Company2 has another function of profit growth $x^4$. Method profit() should be overridden by this subclass:

class Company2 extends BusinessCompany {
    String name = "AECOM";
    int numOfWorkers = 171;
    public double profit(double x) {
        double m = Math.pow(x, 4);
        return m;
    }
}

So we have superclass and three subclasses. Every subclass can use instance variables and methods of superclass. And let's create a main class:

class MainC {
    public static void main(String[] args) {
        Company1 A = new Company1();
        Company2 B = new Company2();
        Company3 C = new Company3();
        System.out.println(A.name+"; "+A.numOfWorkers+"; "+A.profit(32));
        System.out.println(B.name+"; "+B.numOfWorkers+"; "+B.profit(12));
        System.out.println(C.name+"; "+C.numOfWorkers+"; "+C.profit(22));
    }
}