Object Oriented Programming interview questions part 21
Object Oriented Programming interview questions part 21
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Total Questions: 20
1. DataInputStream is derived from ______________________
Correct Answer is : StreamInput
2. Which attribute can be used to get the size of an array?
Correct Answer is : Array_name.length
3. Number class can’t manipulate ____________________
Correct Answer is : Character values
4. Which function should be used to exit from the program that is provided by System class?
Correct Answer is : exit(int);
5. Which class contain runFinalization() method?
Correct Answer is : System
6. What does load(String)::= function do, in System class?
Correct Answer is : Loads dynamic library for a path name
7. Which is not a System class variable?
Correct Answer is : put
8. Which package contains the utility classes?
Correct Answer is : java.util
9. Which among the following best describes the Inheritance?
Correct Answer is : Using the data and functions into derived segment
10. How many basic types of inheritance are provided as OOP feature?
Correct Answer is : 4
11. Which among the following best defines single level inheritance?
Correct Answer is : A class inheriting a base class
12. Which among the following is correct for multiple inheritance?
Correct Answer is : class student{public: int marks;}s; class stream{int total;}; class topper:public student, public stream{ };
13. Which among the following is correct for hierarchical inheritance?
Correct Answer is : One base class can be derived into other two derived classes or more
14. Which is the correct syntax of inheritance?
Correct Answer is : class derived_classname : access base_classname{ /*define class body*/ };
15. Which type of inheritance leads to diamond problem?
Correct Answer is : Multiple
16. Which access type data gets derived as private member in derived class:
Correct Answer is : Private
17. If a base class is inherited in protected access mode then which among the following is true?
Correct Answer is : Public and Protected members of base class becomes protected members of derived class
18. Members which are not intended to be inherited are declared as:
Correct Answer is : Private members
19. While inheriting a class, if no access mode is specified, then which among the following is true? (in C++)
Correct Answer is : It gets inherited privately by default
20. If a derived class object is created, which constructor is called first?
Correct Answer is : Base class constructor
