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This article mainly explains "how to understand the basic types of Scala". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to understand the basic types of Scala.

Types in Scala are closer to the idea of. Net than Java. All types are based on a base type, including value types that also inherit from that type.

The Java median type is provided directly by the language, which is a little different.

The type diagram is as follows:

Where all types of base classes are associated with Any

Any is then divided into two AnyVal and AnyRef

Where AnyVal is the parent of all value types

AnyRef is the parent of all reference types

Slightly different from other languages, Scala also defines the bottom type

Where the Null type is the bottom type of all reference types, and the null value of all AnyRef types is Null

Nothing is the bottom type of all types, corresponding to the Any type.

Both Null and Nothing are empty, which can be understood at a glance.

Among the underlying types, only String inherits from AnyRef, and like Java and. Net, String in Scala is also a memory immutable object, which means that all string operations produce new strings.

Other basic types such as Int are wrapped by Scala, for example, the Int type corresponds to Scala.Int, but the Scala package is automatically referenced by each source file, and it looks as if the Int type is directly built into the language.

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