Object oriented concepts UE Past Papers Questions.

Explain the following terms and statement in briefy as used in object oriented programming

1. Concept of inheritance
2. Encapsulation
3. Relationship between superclass and subclass in the concept of inheritance
4. Overriding superclass methods

Answer / Solution

Compile this code and correct if there is any error and state what will be its output.
public class Event{
private int eventGuests;
public void printEventGuests(){
System.out.println(``Event guests:``+eventGuest);
}
}

public class Jaribu{
public static void main(String[] args){
Event hawa = new Event();
hawa.printDinnerChoice();
}
}
public class DinnerEvent extends Event{
public void printDinnerChoice()
{
if(dinnerChoice=='b')
System.out.println("Dinner choice is beef");
else
System.out.println("Dinner choice is chicken")
}
}

Answer / Solution

What is a constructor in java programming ?

Answer / Solution

What is the output of the following code ?
public class Test{
public static void main(String[] args){
Wende child = new Wende();
child.chuo
}
}
public class Juni{
public udsm()
{
System.out.println("He study at University of Dar es salaam");
}
}
public class Wende extends Juni{
public chuo()


Explain each of the following terms in briefy
-Polymophism
-Method Overloading
-Instance variable

Answer / Solution