Mphasis Placement Paper -: Java Questions With Answers

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1. What is the purpose of the "super" keyword in Java?

   A: To refer to the current object

   B: To invoke the superclass constructor or methods

   C: To create multiple instances of a class

   D: To hide data and methods within a class

   Ans: B

2. What is the purpose of the "this" keyword in Java?

   A: To refer to the superclass

   B: To create multiple instances of a class

   C: To hide data and methods within a class

   D: To refer to the current object

   Ans: D

3. What is the purpose of the "final" keyword in Java?

   A: To prevent the inheritance of a class

   B: To prevent overriding of a method

   C: To prevent modification of a variable's value

   D: All of the above

   Ans: D

4. What is an interface in Java?

   A: A class

   B: A data type

   C: A blueprint for a class

   D: A data structure

   Ans: C

5. Which keyword is used to implement an interface?

   A: extends

   B: new

   C: interface

   D: implements

   Ans: D

6. Can an interface extend another interface in Java?

   A: No

   B: Yes

   Ans: B

7. Can an interface have a constructor?

   A: Yes

   B: No

   Ans: B

8. Which of the following access modifiers are implicitly applied to variables in an interface?

   A: private

   B: protected

   C: public

   D: default

   Ans: C

9. Is it possible to create an instance of an interface?

   A: Yes

   B: No

   Ans: B

10. How many interfaces can a Java class implement?

    A: None

    B: Only one

    C: Two

    D: As many as needed

    Ans: D

11. Can an interface inherit from a class?

    A: Yes

    B: No

    Ans: B

12. Can an interface method be declared as final?

    A: Yes

    B: No

    Ans: B

13. In Java 9, which type of methods can be added to interfaces to share code between methods?

    A: Static

    B: Private

    C: Final

    D: Protected

    Ans: B

14. An interface with no methods is known as?

    A: Abstract Interface

    B: Marker Interface

    C: Empty Interface

    D: Functional Interface

    Ans: B

15. Which keyword is used to define a default method in an interface?

    A: static

    B: default

    C: final

    D: abstract

    Ans: B

16. Are all methods in an interface abstract?

    A: Yes

    B: No

    Ans: B

17. Which of these can be contained in an interface?

    A: Abstract methods

    B: Constants

    C: Default and static methods

    D: All of the above

    Ans: D

18. Which Java feature helps achieve multiple inheritance?

    A: Abstract classes

    B: Static methods

    C: Interfaces

    D: Enums

    Ans: C

19. What is the default access modifier of a method in an interface in Java?

    A: private

    B: protected

    C: public

    D: None of the above

    Ans: C

20. Why were default methods introduced in Java 8 interfaces?

    A: To provide multiple inheritance

    B: To add utility functions

    C: To provide backward compatibility with older interface versions

    D: For better performance

    Ans: C

21. Starting from which Java version can an interface contain method implementations?

    A: Java 5

    B: Java 7

    C: Java 8

    D: Java 9

    Ans: C

22. What is the purpose of the instanceof operator?

    A: Multiply instances

    B: Compare two object references

    C: Check if an object is an instance of a specific class or interface

    D: To create a new instance of a class

    Ans: C

23. Which keyword is used to declare a class variable?

    A: volatile

    B: transient

    C: static

    D: final

    Ans: C

24. Which keyword is used to prevent a class from being inherited?

    A: final

    B: abstract

    C: class

    D: extends

    Ans: A

25. Which keyword is used to create an instance of a class?

    A: new

    B: return

    C: this

    D: create

    Ans: A

26. Which keyword is used to inherit the properties and methods from another class?

    A: import

    B: package

    C: extends

    D: implements

    Ans: C

27. Which keyword is used to refer to the current instance of a class?

    A: class

    B: this

    C: instance

    D: object

    Ans: B

28. Which keyword in Java is used for importing packages into a program?

    A: import

    B: package

    C: include

    D: requires

    Ans: A