Wrapper classes for the primitive data types

In fact, Java already provides so-called wrapper classes for the primitive data types. Each primitive data type has an associated class, that typically has the same name as the data type, but starts with a capital letter (except for int and char, where the name of the wrapper class is different):

Primitive data type	Corresponding wrapper class
byte	Byte
short	Short
int	Integer
long	Long
float	Float
double	Double
char	Character
boolean	Boolean

• These classes define special static methods that allow us to perform operations (such as conversions from and to strings) on the corresponding primitive data types.
• Moreover, they allow us to ``wrap'' values of primitive types into objects (which is why they are called wrapper classes). We already discussed the usefulness of this aspect in parameter passing.