Question

12. Given a class Date and a class Time, define a class DateTime1 using inheritance and a class DateTime2 using composition. Explain the advantages of each implementation.

Answer 1

Solution:

class DateTime1 extends Date //Example of Inharitance, is-a relationship

{

//

}

class DateTime2 //Example of composition, Has-a relationship

{

private Time time= new Time();

}

Advantages of inharitance:

• The advantage of class inheritance is that it is done statically at compile-time and is easy to use.

Disadvantage:

• the subclass becomes dependent on the parent class implementation.

composition advantage:

• implementations can be replaced at run-time. ?

Disadvantage:

• the behavior of the system may be harder to understand just by looking at the source code. ?

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