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In computer science, boxing (a.k.a. wrapping) is the transformation of placing a primitive type within an object so that the value can be used as a reference. Unboxing is the reverse transformation of extracting the primitive value from its wrapper object. Autoboxing is the term for automatically applying boxing and/or unboxing transformations ...
Many languages have explicit pointers or references. Reference types differ from these in that the entities they refer to are always accessed via references; for example, whereas in C++ it's possible to have either a std:: string and a std:: string *, where the former is a mutable string and the latter is an explicit pointer to a mutable string (unless it's a null pointer), in Java it is only ...
Whether you force the programmer to write boilerplate code for boxing/unboxing or decide to go for autoboxing is a language design issue as well. Still, this doesn't change the fact that this article is about the relation between primitive types and object types in OOP languages. Pcap ping 07:11, 27 August 2009 (UTC)
It is intended to allow programs written in different programming languages to easily share information. As used in programming languages, a type can be described as a definition of a set of values (for example, "all integers between 0 and 10"), and the allowable operations on those values (for example, addition and subtraction).
A snippet of Java code with keywords highlighted in bold blue font. The syntax of Java is the set of rules defining how a Java program is written and interpreted. The syntax is mostly derived from C and C++. Unlike C++, Java has no global functions or variables, but has data members which are also regarded as global variables.
Java at first used the expedient of having both primitive and object versions of integers, floating point numbers, etc. The C# programming language (and later versions of Java, starting with Java 1.5) adopted the less elegant solution of using boxing and unboxing, a variant of which had been used earlier in some Lisp implementations.
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A 1.4.1 level Java runtime or Java development kit must be installed on the machine in order to run this version of Eclipse. [33] N/A: 28 June 2005 3.1 Added Java 5 support: generics, annotations, boxing-unboxing, enums, enhanced for loop, varargs, static imports [34] Callisto: 26 June 2006 [35]