Object Oriented Programming interview questions part 16
Object Oriented Programming interview questions part 16
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Total Questions: 20
1. Java supports direct downcasting.
Correct Answer is : FALSE
2. Which way the downcasting is possible with respect to inheritance?
Correct Answer is : Downward the inheritance order
3. What happens when downcasting is done but not explicitly defined in syntax?
Correct Answer is : Compile time error
4. When is downcating used?
Correct Answer is : To compare two objects
5. Why is downcasting possible in any language?
Correct Answer is : Because inheritance follows is-a relationship
6. Which among the following best describes encapsulation?
Correct Answer is : It is a way of combining various data members and member functions that operate on those data members into a single unit
7. If data members are private, what can we do to access them from the class object?
Correct Answer is : Create public member functions to access those data members
8. While using encapsulation, which among the following is possible?
Correct Answer is : Data member’s data type can be changed without changing any other code
9. Which feature can be implemented using encapsulation?
Correct Answer is : Abstraction
10. Find which of the following uses encapsulation?
Correct Answer is : class student{int a; public: void disp(){ cout<
11. Encapsulation helps in writing ___________ classes in java
Correct Answer is : Immutable
12. Which among the following should be encapsulated?
Correct Answer is : The data which is prone to change is near future
13. How can Encapsulation be achieved?
Correct Answer is : Using Access Specifiers
14. Which among the following violates the principle of encapsulation almost always?
Correct Answer is : Global variables
15. Which among the following would destroy the encapsulation mechanism if it was allowed in programming?
Correct Answer is : Using access declaration for private members of base class
16. Which among the following can be a concept against encapsulation rules?
Correct Answer is : Using any kind of pointer/array address in passing to another function
17. Consider the following code and select the correct option: class student { int marks; public : int* fun() { return &marks; } }; main() { student s; int *ptr=c.fun(); return 0; }
Correct Answer is : This code violates encapsulation
18. Consider the code and select the wrong choice:
class hero
{
char name[10];
public : void disp()
{
cout<
Correct Answer is : This maintains encapsulation
Correct Answer is : This maintains encapsulation
19. Encapsulation is the way to add functions in a user defined structure.
Correct Answer is : FALSE
20. Using encapsulation data security is ___________
Correct Answer is : Ensured to some extent
