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Computers
University
Access Modifiers, Inheritance & Polymorphism
39 questions
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- 1. Multiple Choice
Which of this keyword must be used to inherit a class?
super
this
extent
extends
- 2. Multiple Choice
A class member declared protected becomes a member of subclass of which type?
public member
private member
protected member
static member
- 3. Multiple Choice
Which of these is correct way of inheriting class A by class B?
class B + class A {}
class B inherits class A {}
class B extends A {}
class B extends class A {}
- 4. Multiple Choice
What is the output of this program?
0
1
2
Compilation Error
- 5. Multiple Choice
What is the output of this program?
2 2
3 3
2 3
3 2
- 6. Multiple Choice
What is the output of this program?
1 2
2 1
Runtime Error
Compilation Error
- 7. Multiple Choice
What is not type of inheritance?
Single inheritance
Double inheritance
Hierarchical inheritance
Multiple inheritance
- 8. Multiple Choice
what is the output?
Base
Derived
compile time error
run-time error
- 9. Multiple Choice
Output of following Java program?
Base
Derived
Derived
Base
Base
Derived
Base
Derived
Base
Compiler Error
- 10. Multiple Choice
Which of the following is true about inheritance in Java?
1, 2 and 4
Only 1 and 2
1, 2 and 3
2, 3 and 4
- 11. Multiple Choice
output of the program
Base::show() called
Compiler Error
Derived::show() called
None
- 12. Multiple Choice
output of the program
Base::show() called
Derived::show() called
Compiler Error
Runtime Error
- 13. Multiple Choice
Output of following Java Program?
Derived::show() called
compile time error
Base::show() called
runtime error
- 14. Multiple Choice
Predict the output of following Java program?
0
garbage value
compile time error
runtime error
- 15. Multiple Choice
Predict the output of following Java program
garbage value
0
compile time error
runtime error
- 16. Multiple Choice
output of the program
Compile error
values of obj1:
a = 11 b = 21
values of obj2:
a = 11 b = 21
values of obj1:
a = 11 b = 21
values of obj2:
a = 10 b = 20
values of obj1:
a = 11 b = 20
values of obj2:
a = 10 b = 21
runtime error
- 17. Multiple Choice
Predict the output of the following program.
Compilation error
Inside First
Inside First
Inside First
Inside Second
Runtime error
- 18. Multiple Choice
What is the output of the following JAVA program ?
dogood : dogoodgood
dogood : gooddogood
dogood : dodogood
dogood : dogood
- 19. Multiple Choice
Predict the output?
20
0
Compiler Error
none
- 20. Multiple Choice
Which of the following is/are true about constructors in Java?
1
1,2
1, 2, 4
1,2,3 & 4
- 21. Multiple Choice
output of the program
inside static block
a = 4
inside constructor
a = 11
Compiler Error
Run Time Error
inside static block
a = 4
inside constructor
a = 5
inside static block
a = 10
inside constructor
a = 11
- 22. Multiple Choice
What is the process of defining a method in a subclass having same name & type signature as a method in its superclass?
Method overloading
Method overriding
Method hiding
None of the mentioned
- 23. Multiple Choice
What is the output of this program?
2
3
7
compile time error
- 24. Multiple Choice
what is the output
9.0 9.0
9 9
compile time error
none
- 25. Multiple Choice
I am a Person
I am a Student
I am a Person I am a Student
I am a Student I am a Person
- 26. Multiple Choice
Which of this access specifies can be used for a class so that its members can be accessed by a different class in the same package?
Public
Protected
No Modifier
All of the mentioned
- 27. Multiple Choice
Which of these access specifiers can be used for a class so that its members can be accessed by a different class in the different package?
Public
Protected
Private
No Modifier
- 28. Multiple Choice
Which of the following is an incorrect statement about packages?
Package defines a namespace in which classes are stored
A package can contain other package within it
Java uses file system directories to store packages
A package can be renamed without renaming the directory in which the classes are stored
- 29. Multiple Choice
For which purpose packages are used in Java?
Categorizes data
Organizing java classes into namespaces
faster compilation
None of These
- 30. Multiple Choice
A package is a collection of
classes
interfaces
editing tools
classes and interfaces
- 31. Multiple Choice
If a variable is declared as private , then it can be used in _______.
Any class of any package.
Any class of same package.
Only in the same class.
Only subclass in that package.
- 32. Multiple Choice
which package is imported implicitly?
java.applet
java.util
java.lang
java.io
- 33. Multiple Choice
Math class is in ………package.
java.io
java.lang
java.util
java.applet
- 34. Multiple Choice
………………….. package in java contents language utility classes such as vectors, hash tables, random numbers date etc.
java.util
java.awt
java.net
java.lang
- 35. Multiple Choice
…………………….. package in java contents set of classes for implementing graphical user interface, which includes classes for windows, buttons, lists, menus and so on.
java.util
java.awt
java.net
java.lang
- 36. Multiple Choice
Which keyword can protect a class in a package from accessibility by the classes outside the package.
i) private ii) protected iii) final
i only
ii only
iii only
None of the above
- 37. Multiple Choice
Which of the following classes in Java.io package defines a method to delete a file.
Stack
File
String
Vector
- 38. Multiple Choice
The Date class includes within ………………….. package.
java.io
java.awt
java.net
java.util
- 39. Multiple Choice
By convention, java packages begin with ………………. letters while all the class names begin with an ………………… letter.
uppercase, uppercase
lowercase, lowercase
uppercase, lowercase
lowercase, uppercase
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