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Interview Questions and Answers - Order By Newest

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 Q1041. What is the size of long data type ?

a. 16 bit
b. 32 bit
c. 64 bit
d. 128 bit
Ans. 64 bit

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 Q1042. What is the size of double type ?

a. 16 bit
b. 32 bit
c. 64 bit
d. 128 bit
Ans. 64 bit

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 Q1043. What is the size of short type ?

a. 8 bit
b. 16 bit
c. 32 bit
d. 128 bit
Ans. 16 bit

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 Q1044. POM stands for ...

a. Project Object Model
b. Project Oriented Model
c. Prospective Object Model
d. Prospective Objective Model
Maven
Ans. Project Object Model

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 Q1045. Which of the following is not type of Maven Repository ?

a. Local
b. Remote
c. Maven Central
d. Maven Local
Maven
Ans. Maven Local

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 Q1046. What is the default location of local repository ?

a. ~/.m2/repo
b. ~/m2./home/repository
c. ~/m2./repository
d. ~/m2./home/repo
Maven
Ans. ~/m2./repository

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 Q1047. Which of the following is not type of Maven Plugin ?

a. Build
b. Reporting
c. Remote
d. All are valid Maven Plugin types
Maven
Ans. Remote

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 Q1048. What is a project's fully qualified artifact name?

a. ::
b. :
c. ::
d. :
Maven
Ans. ::

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 Q1049. Effective Java 6 , TreeMap implements ...

a. Map Interface
b. SortedMap Interface
c. NavigableMap Interface
d. SortedNavigableMap Interface
Ans. SortedMap Interface

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 Q1050. Which of the following is not possible ?

a. try block followed by catch
b. try block followed by finally
c. try block followed by catch block and then finally
d. try block without catch or finally block
Ans. try block without catch or finally block

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 Q1051. Which of the following is not the difference between Singleton and Static class ( Class with static members only ) ?

a. Only one object can be created for Singleton class whereas No objects are created for static class.
b. Singleton class instance is initiated using new keyword whereas static class instance is created using static method.
c. Singleton class can be serialized whereas Static class cannot be.
d. Singleton Class can participate in runtime Polymorphism whereas Static class cannot.
Ans. Singleton class instance is initiated using new keyword whereas static class instance is created using static method.

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 Q1052. Variables of an interface are intrinsically ...

a. transient
b. final
c. public
d. static
Ans. b,c and d i.e final , public and static

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 Q1053. Which of the following class creates mutable objects ?

a. Boolean
b. File
c. String
d. StringBuffer
Ans. StringBuffer

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 Q1054. Which of the following is not true for final variables ?

a. They cannot be changed after initialization
b. They can be initialized within static method
c. They can be declared and initialized together at the same place
d. They can be initialized within constructor
Ans. They can be initialized within static method

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 Q1055. Which of the following is false for final ?

a. Final methods cannot be overriden
b. Final methods cannot be overloaded
c. Final classes cannot be subclassed
d. Final class cannot be abstract
Ans. Final methods cannot be overloaded

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 Q1056. Invoking start twice on same thread leads to ..

a. ClassCastException
b. NullPointerException
c. InterruptedException
d. IllegalStateException
Ans. IllegalStateException

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 Q1057. Which of the following is false about var args ?

a. Var Args argument should have data type followed by three dots
b. Three dots should be consecutive and not separated by even space
c. We cannot have space before and after the dots
d. If there is a var args in the method, it should be only one and the last one.
Ans. We cannot have space before and after the dots

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 Q1058. Strings in switch were introduced in Which Java version ? a. Java 5 b. Java 6 c. Java 7 d. JavaCore Java
Ans. Java 7

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 Q1059. Which is the default Input Formats defined in Hadoop ?

a. SequenceFileInputFormat
b. ByteInputFormat
c. KeyValueInputFormat
d. TextInputFormat
Ans. TextInputFormat

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 Q1060. Which of the following is not an input format in Hadoop ?

a. TextInputFormat
b. ByteInputFormat
c. SequenceFileInputFormat
d. KeyValueInputFormat
Ans. ByteInputFormat

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 Q1061. Which of the following is a valid flow in Hadoop ?

a. Input -> Reducer -> Mapper -> Combiner -> -> Output
b. Input -> Mapper -> Reducer -> Combiner -> Output
c. Input -> Mapper -> Combiner -> Reducer -> Output
d. Input -> Reducer -> Combiner -> Mapper -> Output
Ans. Input -> Mapper -> Combiner -> Reducer -> Output

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 Q1062. MapReduce was devised by ...

a. Apple
b. Google
c. Microsoft
d. Samsung
Ans. Google

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 Q1063. Which of the following is not a phase of Reducer ?

a. Map
b. Reduce
c. Shuffle
d. Sort
Ans. Map

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 Q1064. How many instances of Job tracker can run on Hadoop cluster ?
a. 1
b. 2
c. 3
d. 4
Ans. 1

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 Q1065. Which of the following is not the Dameon process that runs on a hadoop cluster ?

a. JobTracker
b. DataNode
c. TaskTracker
d. TaskNode
Ans. TaskNode

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 Q1066. What is an instance variable?

a. An instance or object of an class
b. The field of an object
c. Any variable of a class
d. None of the above
Ans. The field of an object

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 Q1067. Which of the following do you think is the primary reason you would never use a static class even the application doesn't need multiple requests or threads ?

a. Serialization
b. Runtime Polymorphism
c. Lazy Loading
d. Memory
Ans. Runtime Polymorphism

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Rarely asked as it was introduced with Java 8.
 Q1068. Which keyword specify that a variable is effectively final ? a. final b. No Keyword c. Both of the above d. None of the aboveCore Java
Ans. No Keyword

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 Q1069. What is a Sequence File?

a. A Sequence File contains a binary encoding of an arbitrary number of homogeneous writable objects.
b. A Sequence File contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be of same type.
c. A Sequence File contains a binary encoding of an arbitrary number of heterogeneous writeable objects.
d. A Sequence File contains a binary encoding of an arbitrary number of Writable Comparable objects, in sorted order.
Ans. A Sequence File contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be of same type.

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 Q1070. What is the input to the Reduce function ?

a. One Key and One Value
b. Multiple Keys and Multiple associated Values
c. Multiple Keys and One associated values with each
d. One key and associated values.
Ans. One key and associated values.

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