Editing Pizza (programming language)

{{Other uses|Pizza (disambiguation)}}
{{Infobox programming language
| name                   = Pizza 
| logo                   = 
| paradigm               = [[Generic programming|generics]], [[algebraic types]]
| year                   = 
| designer               = 
| developer              = 
| latest_release_version = 
| latest_release_date    = <!-- {{release date|2009|06|03}} -->
| typing                 = 
| influenced_by          = [[Java (programming language)|Java]]
| influenced             = [[Generic Java]], [[Scala programming language|Scala]]<ref>[http://www.artima.com/scalazine/articles/origins_of_scala.html The Origins of Scala]</ref>
| website                = {{URL|pizzacompiler.sourceforge.net}}
}}

'''Pizza''' is an [[Open-source model|open-source]] superset of [[Java 1.4]], prior to the introduction of [[generics in Java|generics]] for the [[Java (programming language)|Java programming language]].  In addition to its own solution for adding generics to the language, Pizza also added [[function pointer]]s and [[algebraic type]]s with case classes and [[pattern matching]].

In August 2001, the developers made a [[compiler]] capable of working with Java.  Most Pizza applications can run in a Java environment, but certain cases will cause problems.

Pizza's last version was released in January 2002. Its main developers turned their focus afterwards to the [[Generic Java]] project: another attempt to add generics to Java that was officially adopted as of
[[Java_version_history#Java SE 5|version 5]] of the language. The pattern matching and other [[functional programming]]-like features have been further developed in the [[Scala programming language]]. 
[[Martin Odersky]] remarked, "we wanted to integrate the [[Functional programming|functional]] and [[Object-oriented programming|object-oriented]] parts in a cleaner way than what we were able to achieve before with the Pizza language. [...] In Pizza we did a clunkier attempt, and in Scala I think we achieved a much smoother integration between the two."<ref>[http://www.artima.com/scalazine/articles/goals_of_scala.html The Goals of Scala's Design]</ref>

==Example==
<syntaxhighlight lang="java">
public final class Main {
  public int main(String args[]) {
    System.out.println(
      new Lines(new DataInputStream(System.in))
        .takeWhile(nonEmpty)
        .map(fun(String s) -> int { return Integer.parseInt(s); })
        .reduceLeft(0, fun(int x, int y) -> int { return x + y; }));
        while(x == 0) { map.create.newInstance() }
  }
}
</syntaxhighlight>

==References==
{{Reflist}}

==External links==
*{{Official website|pizzacompiler.sourceforge.net}}

[[Category:Java programming language family]]
[[Category:JVM programming languages]]