Scala MCQs (Chapterwise Multiple Choice Questions)

Why would you make a field private?

So only methods in the same file can access the field

So only methods in the same package can access the field

So only methods in the same class could access the field

So only methods defined in a Java class can access the field

Answer & Explanation

Correct Answer: So only methods in the same class could access the field

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What is the defaut parameter call semantics?

By Inference

By Value

By Name

By Reference

Answer & Explanation

Correct Answer: By Value

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Scala is:

A dynamic language that can be used to program in object-oriented style efficiently

An advanced Object-Oriented Language much better than Java that runs on the JVM

An advanced Java language implemented by Martin Odersky

An object-functional language that supports functional programming constructs

A pure functional programming language

Answer & Explanation

Correct Answer: An object-functional language that supports functional programming constructs

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What do you call objects with immutable state?

Singletons

Stationary objects

Functional objects

Fixed objects

Answer & Explanation

Correct Answer: Functional objects

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Scala's "Unit" roughly corresponds to which Java type?

"void"

"bool"

"null"

"get"

Answer & Explanation

Correct Answer: "void"

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Which term makes the contents of packages available without prefixing?

Use

Include

Import

Assertion

Answer & Explanation

Correct Answer: Import

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Which statement about if-else-if-else statements is true?

If the first else-if does not succeed, then no other else-ifs are tested.

If an else-if does not succeed, then none of the remaining else-if statements or elses will be tested.

All else-if statements are tested in all cases.

If an else-if succeeds, then none of the remaining else-if statements or elses will tested.

Answer & Explanation

Correct Answer: If an else-if succeeds, then none of the remaining else-if statements or elses will tested.

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What is denotes the intersection between two sets?

||

&&

&

%

Answer & Explanation

Correct Answer: &

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Which statement about case classes is false?

Case classes as sealed and therefor cannot be extended

You can construct instances of these classes without using the new keyword

The toString method is automatically redefined

The equals method is automatically redefined

Answer & Explanation

Correct Answer: Case classes as sealed and therefor cannot be extended

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What would be returned by the following function: def foo(l:List[Int]) = { var x=l.head; l.collect{ case a:Int if a>x => x=a; a }; x } When passed: List(2,4,6,8,6,3,1)

8

2

30

Nothing, there's no return value.

1

Answer & Explanation

Correct Answer: 8

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Scala Quick Quiz

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