Java Programming - Java Package And Interface Questions and Answers

Java Package and Interface Objective Questions with Answers from Basic to advanced. What are packages? What is use of packages?


Java Programming: Java Package And Interface

1. Which of these keywords is used to define interfaces in Java?
[A] interface
[B] Interface
[C] intf
[D] Intf
2. Which of these can be used to fully abstract a class from its implementation?
[A] Objects
[B] Packages
[C] Interfaces
[D] None of the Mentioned.
3. Which of these keywords is used to define interfaces in Java?
[A] interface
[B] Interface
[C] intf
[D] Intf
4. Which of these keywords is used to define interfaces in Java?
[A] interface
[B] Interface
[C] intf
[D] Intf
5. Which of these can be used to fully abstract a class from its implementation?
[A] Objects
[B] Packages
[C] Interfaces
[D] None of the Mentioned.
6. Which of these access specifiers can be used for an interface?
[A] Public
[B] Protected
[C] private
[D] All of the mentioned
7. Which of these keywords is used by a class to use an interface defined previously?
[A] import
[B] Import
[C] implements
[D] Implements
8. Which of the following is correct way of implementing an interface salary by class manager?
[A] class manager extends salary {}
[B] class manager implements salary {}
[C] class manager imports salary {}
[D] None of the mentioned.
9. Which of the following package stores all the standard java classes?
[A] lang
[B] java
[C] util
[D] java.packages
10.
Which of the following is incorrect statement about packages?
[A] Interfaces specifies what class must do but not how it does.
[B] Interfaces are specified public if they are to be accessed by any code in the program.
[C] All variables in interface are implicitly final and static.
[D] All variables are static and methods are public if interface is defined pubic

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