Monday, 21 December 2015

Java 8 - MCQ set 1 (25 questions, 55 marks)

Java 8 - MCQ set 1 (25 questions, 55 marks)



    Q1 - Q5, 5 EASY level difficulty questions 1 mark each. 1 * 5 = 5 marks 

  1. Lambdas introduced in Java 8 allow us to treat -

    2. a.Data as code
    b.Code as data
    c.none
    d.all

  2. The newly introduced Streams API is available in which package:

    3. a.java.io.streams
    b.java.io.stream
    c.java.util.streams
    d.java.util.stream

  3. Which class can be used Instead of System.getCurrentTimeMillis() to get a date and time -

    4. a.Clock
    b.Date
    c.Time
    d.Timer

  4. Lambda expressions are based on

    5. a.Procedural programming
    b.Functional programming
    c.Data programming
    d.All

  5. how many methods are there in the functional interface?

    6. a.0
    b.1
    c.2
    d.3



    Q6 - Q15, 10 MEDIUM level difficulty questions 2 mark each. 2 * 10 = 20 marks

  6. In Java 8 Interfaces, methods can be:

    7. a.default
    b.abstract
    c.all
    d.none

  7. The Java 8 API with a sequence of elements which of these supports sequential and parallel aggregate operations -

    8. a.Hadoop
    b.Streams
    c.sequence programming
    d.Big-data

  8. Stream operations can be divided into

    9. a.Terminal types
    b.Intermediate types
    c.All
    d.None

  9. Which package contains Date/Time (JSR 310) API -

    10. a.java.time
    b.java.util.time
    c.java.timedate
    d.java.util.calendar

  10. Nashorn the new JavaScript engine is an implementation of -

    11. a.javax.engine.Engine
    b.javax.script.Engine
    c.javax.javaScript.Engine
    d.javax.script.ScriptEngine

  11. Which is new command line tool for the Nashhorn JavaScript engine -

    12. a.jcs
    b.jfs
    c.jjs
    d.jss

  12. Which of these should be used to show package-level and class-level dependencies of Class files

    13. a.dep
    b.ideps
    c.jdep
    d.jdeps

  13. Predicate is in which package

    14. a.java.util.predicate
    b.java.util.object
    c.java.util.objects
    d.java.util.predict

  14. Which of these represents a process that accepts one argument and produces a result

    15. a.Function
    b.Process
    c.Method
    d.JavaFunctions

  15. Function is ?

    16. a.Class
    b.Interface
    c.Lambda Expression
    d.Object



    Q16 - Q25, 10 HARD level difficulty questions 3 mark each.       3 * 10 = 30 marks

  16. PermGen space has been replaced with which of these in Java 8 -

    17. a.PermSpace
    b.PermSpaceGen
    c.Metaspace
    d.MetaGenSpace

  17. What can help us in avoiding NullPointeExceptions and null checks in Java 8 -

    18. a.Optional
    b.Required
    c.NotNull
    d.NotRequired

  18. code for Java 8 essentially used to be -

    19. a.Declarative
    b.Imperative
    c.Subjective
    d.None

  19. R apply(T t) is a method of-

    20. a.Function
    b.Process
    c.Predicate
    d.None

  20. What is Predicate in Java 8 -

    21. a.method
    b.class
    c.Interface
    d.Framework

  21. How sorting speed has been improved significantly on multi-core machines by using -

    22. a.Arrays.parallelSort
    b.Arrays.sort
    c.Collection.parallelSort
    d.Arrays.sortParallelly

  22. Which is aggregate operation in Java 8

    23. a.filter
    b.map
    c.forEach
    d.All

  23. Example of functional interfaces -

    24. a.java.util.concurrent.Callable
    b.java.lang.Runnable
    c.All
    d.None

  24. Which method can be used to check null on an Optional variable

    25. a.isPresent()
    b.isNullable()
    c.isPresentable()
    d.isNotNull()

  25. We need to override which Predicate method -

    26. a.predict(T t)
    b.predictable(T t)
    c.testable(T t)
    d.test(T t)




Quiz 1 - Correct answers



EASY
1) b
2) d
3) a
4) b
5) b

MEDIUM
6) c
7) b
8) c
9) a
10) d
11) c
12) d
13) b
14) a
15) b

HARD
16) c
17) a
18) b
19) a
20) c
21) a
22) d
23) c
24) a
25) d






Java 8 - MCQ set 2 (25 questions, 55 marks)



    Q1 - Q5, 5 EASY level difficulty questions 1 mark each. 1 * 5 = 5 marks 

  1. Functional interfaces can be annotated as

    2. a.@Function
    b.@FunctionalInterface
    c.@Functional
    d.@Interface

  2. Functional interfaces method is

    3. a.static
    b.abstract
    c.final
    d.none

  3. What needs to be implemented to use lambda expression

    4. a.Functional interface
    b.Functional class
    c.Functional method
    d.Functional object

  4. Functional interface methods can be declared as

    5. a.static
    b.abstract
    c.final
    d.All

  5. What will be output of following code -


    6. a.compilation error
    b.Runtime Exception
    c.Compile and execute without any Exception or error
    d.None



    Q6 - Q15, 10 MEDIUM level difficulty questions 2 mark each. 2 * 10 = 20 marks

  6. void accept(T t) is method of -

    7. a.Consumer
    b.Producer
    c.Both
    d.None

  7. Which of these does Stream filter() operates on

    8. a.Predicate
    b.Interface
    c.Class
    d.Methods

  8. Which of these does Stream map() operates on

    9. a.Class
    b.Interface
    c.Predicate
    d.Function

  9. Which of these does forEach() operates on

    10. a.Methods
    b.Consumer
    c.Producer
    d.Predicate

  10. A pipeline is a sequence of what operations in java 8

    11. a.multi-threading
    b.concurrent
    c.consequent
    d.stream

  11. How can we obtain source of objects in java 8?

    12. a.Stream stream()
    b.Stream obtain()
    c.Stream obtainSource()
    d.All

  12. What will be output of following code -


    13. a.compilation error
    b.Runtime Exception
    c.Compile and execute without any Exception or error
    d.None

  13. What will be output of following code -


    14. a.compilation error
    b.Runtime Exception
    c.Compile and execute without any Exception or error
    d.None

  14. What will be output of following code -


    15. a.compilation error
    b.Runtime Exception
    c.Compile and execute without any Exception or error
    d.None

  15. What will be output of following code -


    16. a.compilation error
    b.Runtime Exception
    c.Compile and execute without any Exception or error
    d.None



    Q16 - Q25, 10 HARD level difficulty questions 3 mark each.       3 * 10 = 30 marks

  16. What will be output of following code -


    17. a.Strings
    b.Integers
    c.Characters
    d.Float

  17. Lambda expressions are __________ scoped

    18. a.Lexically
    b.Semantically
    c.Binary
    d.None

  18. On which of these does annotations can be used on in Java 8

    19. a.Local variables
    b.Super classes
    c.Generic types
    d.All of these

  19. What will be output of following code -


    20. a.compilation error
    b.Runtime Exception
    c.Compile and execute without any Exception or error
    d.None

  20. What will be output of following code -


    21. a.compilation error
    b.compilation error
    c.Compile and execute without any Exception or error
    d.None

  21. What will be output of following code -


    22. a.output may be 125
    b.output may be 695
    c.output may be 1511
    d.output may be 456

  22. What will be output of following code -


    23. a.Full Name: [none]
    b.
    c.compilation error
    d.compilation error

  23. What will be output of the following code -


    24. a.compilation error
    b.Runtime Exception
    c.Compile and execute without any Exception or error
    d.None

  24. What will be output of following code -


    25. a.compilation error
    b.Runtime Exception
    c.Compile and execute without any Exception or error
    d.None

  25. What will be output of the following code -


    26. a.compilation error
    b.Runtime Exception
    c.Compile and execute without any Exception or error
    d.None




Quiz 2 - Correct answers



EASY
1) b
2) b
3) a
4) d
5) c

MEDIUM
6) a
7) a
8) d
9) b
10) d
11) a
12) c
13) b
14) c
15) c

HARD
16) b
17) a
18) d
19) c
20) c
21) b
22) a
23) c
24) c
25) a
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