Object Oriented Programming interview questions part 42
Object Oriented Programming interview questions part 42
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Total Questions: 20
1. If protected inheritance is used then _____
Correct Answer is : Protected and Public members become protected in subclass
2. If protected members are to be accessed from outside the class then__________
Correct Answer is : Members must be made public
3. Which among the following can use protected access specifier?
Correct Answer is : Members which have to be secure and should be used by other packages/subclass
4. Protected access is same as default access that is given implicitly in java if no specifier is mentioned.
Correct Answer is : FALSE
5. If a class have default constructor defined in private access, and one parameter constructor in protected mode, how will it be possible to create instance of object?
Correct Answer is : Define a constructor in public access with different signature
6. What will be the output of the program given below: class A { Public : A(int a=0) { cout<<”new A”; } }; A a; A b; A c;
Correct Answer is : new Anew Anew A
7. Which among the following is true for the code given below: class A { int marks; public : disp() { cout<<marks; } } class B: protected A { char name[20]; } A a; a.disp(); B b; b.disp();
Correct Answer is : Only object of class A can access disp() function
8. If the members have to be accessed from anywhere in program and other packages also, which access specifier should be used?
Correct Answer is : Public
9. Which among the following have least security according to the access permissions allowed?
Correct Answer is : Public
10. Which among the following can be used for outermost class access specifier in java?
Correct Answer is : Default or Public
11. We can reduce the visibility of inherited methods.
Correct Answer is : FALSE
12. If members of a super class are public, then________
Correct Answer is : All those will be available in subclasses
13. How many public class(s) (outermost) can be there in a java program?
Correct Answer is : 1
14. What is output of following code? package pack1; class A { public A() { System.out.print(“object created”); } } package pack2; import pack1.*; class B { A a=new A(); }
Correct Answer is : Compile time error
15. Which among the following for public specifier is false?
Correct Answer is : The static members can’t be public
16. A class has its default constructor defined as public. Class B inherits class A privately. The class:
Correct Answer is : Both classes can have instances
17. Which specifier can be used to inherit protected members as protected in subclass but public as public in subclass?
Correct Answer is : Public
18. Which among the following is true for public class?
Correct Answer is : Public classes can be accessed from any other class using instance
19. If a class doesn’t have public members, then________
Correct Answer is : None of its member function can be called outside the class
20. In multi-level inheritance(all public) , the public members of parent/superclass will ________
Correct Answer is : Will continue to get inherited subsequently
