Packages and Interfaces - Core Java Exam MCQ Questions and Answers

Questions

6 TreeMap class is used to implement which one of the following collection interfaces?

A Set

B SortedSet

C SortedMap

D List

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()

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

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{}

Answer: Option [B]

10 A package is a collection of

A classes

B interfaces

C editing tools

D classes and interfaces

Answer: Option [D]

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

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