Scala Scala Basics and Syntax 2

Question 1

What is the correct way to define a Scala object (singleton)?

Accepted Answer

object MyObject

Answer

The `object` keyword in Scala creates a singleton object, ensuring only one instance exists.

Question 2

Which collection is immutable by default in Scala?

Accepted Answer

scala.collection.immutable.List

Answer

Scala's default `List` from `scala.collection.immutable` is immutable and cannot be modified after creation.

Question 3

What does `_` represent when used as a wildcard in Scala imports?

Accepted Answer

Import all members

Answer

In Scala, `import package._` imports all public members from a package, similar to Java's `import package.*`.

Question 4

How are Scala classes instantiated?

Accepted Answer

new MyClass()

Answer

Scala classes are instantiated using the `new` keyword followed by the class name and constructor arguments.

Question 5

What is the Scala equivalent of Java's `System.out.println`?

Accepted Answer

println

Answer

Scala provides a top-level `println` function that writes a line to standard output, wrapping Java's `System.out.println`.

Scala Practice Test