Object oriented concepts UE Past Papers Questions.

Very briefly explain the following 

1. Class and Object
2. Constructors and their types

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Consider a class Person that consists of instance variables- name, age and gender. Instance methods - setName, getName and getAge. Class method- getAverageAge.

1. Graphically represent this calss using UML notation
2. Write a constructor that initialize all instance variables
3. Using Java language , create an object whose initial values for name, age and gender are Juma, 28 and Male respectively.

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• What is use case diagram?
• Briefly describe the aim of inclusion and extension in the use case diagram.

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Describe the messages and methods in OOP.

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Consider the following scenarios the outline the objects ( at most three) and their interactions in terms of messages ( at least two)  and arguments

• A passenger buying a bus ticket
• A student borrowing a book in library
• A lecturer deliverign his/her lecture to a class of students

Differentiate the sequence and collaboration diagram. Draw the sequence and collaboration diagrams that represents the scenario above.

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