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Feb 9, 2017
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Make unified-types.md more intuitive to new comers #670

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shogowada authored Feb 2, 2017
commit ef5493dd8085062471c32899c1562fd929ea334c
6 changes: 3 additions & 3 deletions tutorials/tour/unified-types.md
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Expand Up @@ -10,15 +10,15 @@ next-page: classes
previous-page: tour-of-scala
---

In Scala, all values are instance of a class, including numerical values and functions. The diagram below illustrates the class hierarchy.
In Scala, all values are instances of a class, including numerical values and functions. The diagram below illustrates the class hierarchy.

![Scala Type Hierarchy]({{ site.baseurl }}/resources/images/classhierarchy.img_assist_custom.png)

## Scala Class Hierarchy ##

The superclass of all classes `scala.Any` has two direct subclasses: `scala.AnyVal` and `scala.AnyRef`.

`scala.AnyVal` represents value classes. All value classes are not nullable and predefined; they correspond to the primitive types of Java-like languages. Note that the diagram above also shows implicit conversions between the value classes.
`scala.AnyVal` represents value classes. All value classes are non-nullable and predefined; they correspond to the primitive types of Java-like languages. Note that the diagram above also shows implicit conversions between the value classes.

`scala.AnyRef` represents reference classes. All non-value classes are defined as reference class. Every user-defined class in Scala implicitly extends `scala.AnyRef`. If Scala is used in the context of a Java runtime environment, `scala.AnyRef` corresponds to `java.lang.Object`.

Expand All @@ -44,7 +44,7 @@ The application defines a variable `list` of type `List[Any]`. The list is initi

Here is the output of the program:

```tut
```
a string
732
c
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