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A Boxing conversion converts the values of a primitive type to the corresponding values of the reference type, for instance, from {{int}} to the type {{Integer}} \[[JLS 5.1.7 Boxing Conversion|http://java.sun.com/docs/books/jls/third_edition/html/conversions.html#5.1.7]\]. It can be convenient in many cases where an object parameter is desired, such as with collection classes like {{Map}} and {{List}}. Another use case is to pass object references to methods, as opposed to primitive types that are always passed by value. The resulting wrapper types also help reduce clutter in code. |
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Autoboxing can automatically wrap the primitive type to the corresponding wrapper object. Some care should be taken during this process, especially when performing comparisons. The Java Language Specification \[[JLS 05|AA. Java References#JLS 05]\] explains this point clearly: |
If the value
pbeing boxed istrue,false, abyte, acharin the range\u0000to\u007f, or anintorshortnumber between-128and127, then letr1andr2be the results of any two boxing conversions ofp. It is always the case thatr1 == r2.
Noncompliant Code Example
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