Data Types

Java language has rich implementation of data types.Data type specify the size 

and value that can be stored in an identifier.

In java data types are specified into two category :-

1. Primitive Data Type
2. Non-Primitive Data Type

A primitive Data types can be of eight types:-

1. char
2. boolean
3. byte
4. short
5. int
6. long
7. float
8. double

Note : -Once a primitive datatype has been declared, its type can never change,although its value can change in most of cases

Data Type	Default Value	Default size
boolean	false	1 bit
char	'\u0000'	2 byte
byte	0	1 byte
short	0	2 byte
int	0	4 byte
long	0L	8 byte
float	0.0f	4 byte
double	0.0d	8 byte

Non-primitive datatype - It is also known as reference data type. Reference

 data type is used to refer an object. A reference variable is declared to be specific and that type can never be changed.