what is wrappper class

[krovi]

what is wrapper calss .where can we use wrapper class in java.give me one example?

[stultuske]

a Wrapper class is a class that 'Wraps' a primitive datatype in a (sort-of) equivalent Object type.

for instance:
primitive int -> Wrapperclass Integer.

each primitive type has a Wrapper class that allows the user to treat variables of primitive types (or at least, their Wrapped versions) as objects.

where you can use it? everywhere, I guess. but if you want to compare using equals, or you want to store the a value of a primitive variable in a list (since they only allow objects).

when looking into Wrapper classes and what they are, I recommend you to also have a look at autoboxing/unboxing.

[JamesCherrill]

The Java classes like Integer, Boolean etc are good examples or wrapper classes, but they are not the only ones. This discussion says it all...
http://stackoverflow.com/questions/889160/what-is-a-wrapper-class