Type Wrappers

primitive type	Wrapper type
byte	Byte
short	Short
int	Int
long	Long
float	Float
double	Double
char	Character
boolean	Boolean

Remember that there is that big split between the primitive data types, and the objects that make up all the rest of the data in a Java program. The split sometimes needs to be crossed. For each primitive type, there is a corresponding wrapper class. A wrapper class can be used to convert a primitive data value into an object, and some type of objects into primitive data. The table shows primitive types and their wrapper classes:

In Java, case matters, so "byte" and "Byte" are different things.

As an example, the value 103 could be held in 16 bit section of memory that is of primitive data type long. The same value could be held in an object that is of type Long. The object will use many more than 16 bits.

Don't worry if this all seems somewhat pointless to you right now. More will be said about wrapper classes later on when you need to use them.