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Packages and Interfaces - Core Java MCQ Questions and Answers - Exam Quiz

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Java Packages & Interfaces Objective 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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(6) TreeMap class is used to implement which one of the following collection interfaces?
[A] Set
[B] SortedSet
[C] SortedMap
[D] List

Comment

Answer: Option [B]

TreeMap class is used to implement SortedMap.

(7) Which of the following is the correct syntax for suggesting that the JVM performs garbage collection?
[A] System.free()
[B] System.setGarbageCollection()
[C] Syste.out.gc()
[D] System.gc()

Comment

Answer: Option [D]

System.gc() is a program that runs for garbage collection. But it not reliable.

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(8) For which purpose packages are used in Java?
[A] Categorizes data
[B] Organizing java classes into namespaces
[C] For faster compilation
[D] None of these

Comment

Answer: Option [B]

Java packages resolves the name conflicts among different classes.

(9) The first statement in java source file
[A] import statement
[B] package statement
[C] main statement
[D] try{} and catch{}

Comment

Answer: Option [B]
(10) A package is a collection of
[A] classes
[B] interfaces
[C] editing tools
[D] classes and interfaces

Comment

Answer: Option [D]

A package is a collection of classes, methods and interfaces.

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