1. Why is encapsulation called Data Hiding?
2. What are the main benefits of using encapsulation in Java?
3. Provide an example of how to achieve encapsulation in Java.
4. Is it possible to declare abstract methods as private?
   1. Justify your answer.
5. Is it compulsory for a class, which has been declared as abstract, to have at least one abstract method?

class which contains the abstract keyword in its declaration is known as abstract class. But, if a class has at least one abstract method, then the class must be declared abstract. 

(Object Oriented Programming in c++)

Answer the following short questions. Your answer should be precise.

1. Can we declare base class constructor or destructor as virtual if yes then why we want to do?
2. How we can declare a class as abstract and why we need abstract classes?
3. Why we cannot able to create objects of abstract classes give reasonable justification of that.   

This question is related to Object orientated programming in c++

I need help with this practical case study
 
Solve using Logicly (free trial) 
 

1. Implement a sequential digital system capable of counting from zero to fifteen.
The design must meet the following requirements:
• Implement it with JK bistables. 
• Use a global clock. 
• The result is displayed on a 7-segment display.

2. The local soccer team has asked us to create a digital scoreboard system to be able to
display the result of the match to the spectators.
The design must meet the following requirements: 
• Reuse the previous design, for this it must be encapsulated.
• Connect 3 push buttons: (Home goal, Away goal and reset).
• The "Home goal" button shows the current score of the home team.
• The "Away goal" button displays the current score of the away team.
• The "reset" push-button performs a reset. 
• Only goals from zero to nine can be displayed.