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CS3360 - Object-Oriented Program Development Assignment - Java Polymorphism

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Q1. Provide a definition for Inheritance-based polymorphism (as opposed to Interface-based polymorphism).

Inheritance-based polymorphism is used to define methods in a base class and override the methods with derived class implementations. So, base class holds one of the several derived class object.

Q2. Provide a definition for Interface-based polymorphism (as opposed to any Inheritance-based polymorphism).

Use of interface-based polymorphism we can create an interface and implement a number of classes. We can also invoke the implemented method of various object which we created in the same way.

Q3. It is possible for methods in separate classes to exist, coincidentally bearing the same name/signature without their having been inherited from another class or interface.

a) Could these also described as "polymorphic" calls?

No, these are not polymorphic calls because we have to inherit the base class to derived class then only we can say polymorphic calls.

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b) What downsides might we experience in attempting to use them polymorphically?

We have to inherit one class to another so that methods are overridden and we can use polymorphic calls to call the methods using object of the respective classes.

Object-Oriented Program Development Assignment.png

Q4. Given only the classes shown in Diagram above: provide their implementations, and complete a working version of the following Java main() method of the Pgm class to correctly determine the total carrying-capacity of a fleet of vehicles.

public class Pgm

{

public static void main(String args[])

{

int totalCapacity = 0;

Automobile[] fleet=new Automobile[3];

fleet[0]=new Sedan("Black");

fleet[1]=new Minivan("Blue");

fleet[2]=new Sportscar("Red");

for(int i=0; i<fleet.length; i++)

{

totalCapacity += fleet[i].getCapacity();

}

System.out.println(totalCapacity);

}

}

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Q5. What does the code you had to write in #4 above suggest to you about the limitations of "coincidental" polymorphic methods not based on Inheritance/Interfaces?

We have to create object for each class to call the respective class methods and have to repeat same code in various classes. When we use inheritance or interface we can reuse the code to overload the method or overridden method.

Q6. Consider an Automobile class with the following implementations of equals methods:

public class Pgm {

public static void main(String args[]) {

Object o = new Automobile();

Automobile auto = new Automobile();

Automobile sedanAuto = new Sedan("Black");

Automobile minivanAuto = new Minivan("Blue");

Sedan sedan = new Sedan("Gray");

Minivan minivan = new Minivan("Pink");

o.equals(o);

o.equals(auto);

o.equals(sedanAuto);

o.equals(minivanAuto);

o.equals(sedan);

o.equals(minivan);

System.out.println();

auto.equals(o);

auto.equals(auto);

auto.equals(sedanAuto);

auto.equals(minivanAuto);

auto.equals(sedan);

auto.equals(minivan);

System.out.println();

sedanAuto.equals(o);

sedanAuto.equals(auto);

sedanAuto.equals(sedanAuto);

sedanAuto.equals(minivanAuto);

sedanAuto.equals(sedan);

sedanAuto.equals(minivan);

System.out.println();

minivanAuto.equals(o);

minivanAuto.equals(auto);

minivanAuto.equals(sedanAuto);

minivanAuto.equals(minivanAuto);

minivanAuto.equals(sedan);

minivanAuto.equals(minivan);

System.out.println();

sedan.equals(o);

sedan.equals(auto);

sedan.equals(sedanAuto);

sedan.equals(minivanAuto);

sedan.equals(sedan);

sedan.equals(minivan);

System.out.println();

minivan.equals(o);

minivan.equals(auto);

minivan.equals(sedanAuto);

minivan.equals(minivanAuto);

minivan.equals(sedan);

minivan.equals(minivan);

}

}

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