what is boxing or unboxing and what is the uses of it in java language, ?

[saneha]

what is boxing or unboxing and what is the uses of it in java language, ? and also give the syntax of it

[Vuhelper]

Boxing & unboxing is the process of converting a primitive value into an object oriented wrapper class (boxing), or converting a value from an object oriented wrapper class back to the primitive value (unboxing).

Java 5 supports automatic conversion of primitive types (int, float, double etc.) to their object equivalents (Integer, Float, Double,…) in assignments, method and constructor invocations. This conversion is know as autoboxing.

Java 5 also supports automatic unboxing, where wrapper types are automatically converted into their primitive equivalents if needed for assignments or method or constructor invocations.For example:

int inative =0;

inative = new Integer(5); // auto-unboxing

Integer intObject =5 ; // autoboxing