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Packages and Interfaces - Objective Type Questions with Answers on Core Java

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Java Packages and Interfaces Multiple Choice Type Questions with Answers. Here five MCQs Questions with Answers are added and each question contain four options as possible answer but only one option is the correct answer. Select one and check your answer with the given correct answer.
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(1) Math class belongs to the package
[A] java.math
[B] java.lang
[C] java.util
[D] none of these

Comment

Answer: Option [B]

java.lang package contain math class. This class contain basic methods to perform mathematical operations.

(2) What class must be extended by all event classes?
[A] java.util.EventListener
[B] java.awt.AWTEvent
[C] java.util.EventObject
[D] java.awt.event.InputEvent

Comment

Answer: Option [C]

java.awt, java.awt.event and java.beans uses the class java.util.EventObject

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(3) What is the name of the Collection interface used to represent elements in a sequence?
[A] Collection
[B] Set
[C] List
[D] Map

Comment

Answer: Option [C]

The List is a collection interface which permits duplicates and represent elements in a particular order.

(4) Which of the following statement is false?
[A] Variables declared inside of interface declaration may be changed by implementing class
[B] Interfaces are designed to support dynamic method resolution at run time
[C] When an interface method is implemented it must be declared as public
[D] Variables declaration are implicitly final

Comment

Answer: Option [A]

Java interface variables are static and final. They cannot be changed.

(5) Which of the following classes directly implement Set interface?
[A] Vector
[B] HashSet
[C] LinkedList
[D] HashTable

Comment

Answer: Option [B]

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