Boxing (computer programming): Difference between revisions

Revision as of 13:33, 10 August 2010

Revision as of 13:36, 10 August 2010

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{{Article issues|expert=Computer science|unreferencedrefimprove=August 2009|cleanup=November 2006|date=August 2009}}

{{Generalize|date=October 2009}}<!-- only talks of Java; there are complaints on the talk page about this -->

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Compilers prior to 5.0 would not accept the last line. <code>Integer</code>s are reference objects, on the surface no different from <code>List</code>, <code>Object</code>, and so forth; mathematical operators such as <code>+</code> were not meaningfully defined for references. As of J2SE 5.0, the <code>Integer</code>s <code>i</code> and <code>j</code> are unboxed into <code>int</code>s, the two are added, and then the sum is autoboxed into a new <code>Integer</code>. <ref>[http://java.sun.com/j2se/1.5.0/docs/guide/language/autoboxing.html java.sun.com Java language guide entry on autoboxing]</ref>

===Unboxing===

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Console.Writeline(j); //outputs "42"

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==References==

{{reflist}}

{{DEFAULTSORT:Object Type (Object-Oriented Programming)}}