Object oriented concepts questions.

State whether each of the following statements is true or false

1. A subclass typically encapsulates less functionality than does its superclass.
2. A superclass typically represents a larger number of objects than its subclass represents.
3. The default case is required in the switch selection structure.
4. The break statement is required in the default case of a switch selection structure.
5. The expression(x>y && a is true if either x>y is true or a is true.
6. The expression containing the || operator is true if either or both of its operands is true.

What is the output of the following code assume grade is neither A nor B nor C
Switch(grade){
case`A`:
System.out.println("Great Job!");
break;

case`B`:
System.out.println("Good Job!");
break;

case`C`:
System.out.println("You can do better!");
break;
default:
System.out.println("Consider cheating!");
}

Design a Java class named UniversityCircle with two methods that compute and display an area and circumference of a circle.

With examples describe the following terms

1. Object oriented programming
2. Dynamic binding
3. Abstraction

Differentiate the following terms

• Overloading and overriding
• this and super keywords in java

Very briefly explain the following 

1. Class and Object
2. Constructors and their types

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.

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

Describe the messages and methods in OOP.

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.