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| license = [[Apache License|Apache]] v2
| website = {{URL|ceylon-lang.org}}
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Ceylon is heavily-influenced by [[Java (programming language)|Java]]'s syntax, but adds many new features.
=== Type
One of the most novel aspects of Ceylon is its [[type system]]. Ceylon foregoes Java's primitive types<ref>{{cite web|last1=King|first1=Gavin|title=Ceylon: Language Design FAQ|url=http://ceylon-lang.org/documentation/faq/language-design/}}</ref> and [[Object type|boxing]] in favor of a type system composed entirely of first-class objects. While this may cause boxing overhead in
Ceylon allows for union and intersection types, in a similar fashion to [[TypeScript]], [[Whiley (programming language)|Whiley]] and Flow.
Union types, written <code>A|B</code>, allow a variable to have more than one type. The following example shows a Ceylon function which may take either an [[Integer (computer science)|integer]] or a [[String (computer science)|string]]:
<source lang="ceylon">
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</source>
==== Enumerated
Similar to Java and many other languages, and with a similar mechanism as algebraic types, Ceylon supports enumerated types, otherwise known as enums. This is implemented in Ceylon with a pattern of limiting the instances of an abstract class at declaration to a limited set of objects (in this case, singleton instances). Another way to implement this pattern is with the new constructor feature in Ceylon 1.2 where the objects are implemented as different named constructor declarations.<ref>{{cite web|last=King|first=Gavin|title=The Ceylon Language: 4.5.8 Enumerated classes |url=http://ceylon-lang.org/documentation/1.2/spec/html/declarations.html#classeswithcases|access-date=6 December 2015}}</ref>
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=== Entry point with names===
A Ceylon program must have a main function called run():
<source lang="ceylon">
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