What are wrapped classes

Wrapped classes are classes that allow primitive types to be accessed as objects.

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  • Apr 3rd, 2007

wrapped classes are inmutable. They are all present in the java.lang package. It provides a class for primitive datatypes.

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  • Feb 3rd, 2009

Wrapper classes are classes that are used to make primitive variables into objects, and to make wrapped objects into primitives. int, boolean, double are all primitive data types and their respective wrapper classes are Integer, Boolean, and Double. Wrapper classes are useful in storing primitive data types in higher level data structures such as Stack

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  • Aug 10th, 2009

Wrapper Classes are like a wrapper over a  resource that is If I have to access a resource I can access it throught that wrapper.

For example:

'java.lang.Integer' is a wrapper class. with resource being primitive type 'int'.

Advantage of using these wrapper class is that we can use lot of utility methods available or created in Wrapper classes to do manipulation on the resource(here in this example 'int').

String str = "55";
Integer.parseInt(str); //using this wrapper class we can parse a string into integer

Integer integer = new Integer("5");       
float floatValue = integer.floatValue();//can convert a integer type to float type byte  type etc.

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