Due: In Lab, the week of October 30th

Main topics: Inheritance & Polymorphism Abstract & Protected

Exercise

This week we will be practicing writing an extended class for a numerous class project. Getting Started To start this exercise, you should:

Open eclipse and start a new Java project named Lab07

Add a Class (named Number) to this project, and copy the contents of the Number.java file

provided into it.

Add a Class (named MyDouble) to this project, and copy the contents of the MyDouble.java file provided into it.

Add a Class (named MyInteger) to this project, the contents of which you will be writting from scratch.

Add a Class (named Driver) to this project, the contents of which you will be writting from scratch.

Requirements

Number.java A very simple class which models some of the functionality of a number. This class is complete and must not be modified.

1. Why is setSet(boolean value) protected? 2. Why is Number division(Number guest) a method of this class? 3. Why is Number division(Number guest) an abstract method?

MyDouble.java A very simple class which extends the Number class to also model some of the function- ality of a floating point number. This class is complete and must not be modified.

Why does the overriding Number division(Number guest) method receive and return Numbers instead of MyDoubles?

Is Polymorphism occurring in the method Number division(Number guest)?

MyInteger.java A very simple class which extends the Number class to also model some of the function-

ality of a 2s complement number. This class you must write, such that:

You write the default and specifying constructors, and in doing so utilize the superclass default and specifying constructors respectively.

You write the standard accessor and mutator.

You override Numbers equals method

You override Numbers toString method

5. You override Numberss division method - note: this is not really an option since it is abstract in Number.

Driver.java A simple driver class to test all of the above classes. This class is complete and must not be modified. Answer the following questions with regard to it:

Identify how Polymorphism is being utilized.

Explain why both the correct division is being performed as well as the correct type re- turned.

If you wrote your MyInteger class correctly then your output will look like:

 num1 = Undefined val1 = Undefined num1 = -4 num2 = 8 

 val1 = 2.4 val2 = 3.6 gen1 = -2 gen2 = -1.6666666666666667 gen3 = -0.6 

gen4 = 1.5

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