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 -

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


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

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 -

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


4. Lambda expressions are based on

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


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

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:

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 -

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


8. Stream operations can be divided into

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


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

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


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

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 -

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

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


13. Predicate is in which package

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

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


15. Function is ?

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 -

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


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

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


18. code for Java 8 essentially used to be -

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


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

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


20. What is Predicate in Java 8 -

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


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

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


22. Which is aggregate operation in Java 8

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


23. Example of functional interfaces -

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

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


25. We need to override which Predicate method -

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

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


2. Functional interfaces method is

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


3. What needs to be implemented to use lambda expression

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


4. Functional interface methods can be declared as

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


5. What will be output of following code -
   
   
   

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 -

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


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

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


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

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


9. Which of these does forEach() operates on

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


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

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


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

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


12. What will be output of following code -
    
    

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 -
    
    

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 -
    
    

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 -
    
    

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 -
    
    

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


17. Lambda expressions are __________ scoped

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


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

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


19. What will be output of following code -
    
    

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 -
    
    

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 -
    
    

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 -
    
    

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


23. What will be output of the following code -
    
    
    

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 -
    
    
    

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 -
    
    

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