asvasudevan

• Apr 3rd, 2007

 

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

amarmail_999

 Profile Answers by amarmail_999 Questions by amarmail_999

• Jul 4th, 2007

 

Wrapped classes are used to Primative data types as an Object.

EX: int val1; val=10;

       val=new Integer();

tech.abha

 Profile Answers by tech.abha 

• 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

Djava

 Profile Answers by Djava 

• 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.