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Java Quick Syntax Reference
book

Java Quick Syntax Reference

by Mikael Olsson
January 2018
Intermediate to advanced content levelIntermediate to advanced
115 pages
1h 37m
English
Apress
Content preview from Java Quick Syntax Reference
© Mikael Olsson 2018
Mikael OlssonJava Quick Syntax Referencehttps://doi.org/10.1007/978-1-4842-3441-9_21

21. Boxing and Unboxing

Mikael Olsson1 
(1)
Hammarland, Länsi-Suomi, Finland
 

Placing a primitive variable in an object is known as boxing. Boxing allows the primitive to be used where objects are required. For this purpose, Java provides wrapper classes to implement boxing for each primitive type —namely, Byte, Short, Integer, Long, Float, Double, Character, and Boolean. An Integer object , for example, can hold a variable of the type int:

int iPrimitive = 5;
Integer iWrapper = new Integer(iPrimitive); // boxing

The opposite of boxing is, naturally, unboxing, which converts the object type back into its primitive type:

iPrimitive = iWrapper.intValue(); ...
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Publisher Resources

ISBN: 9781484234419Purchase LinkPublisher Website