Java Data Types

Data Type	Size	p/r	Value
boolean	$1$ bit	p (Primitive)	True or False
byte	$1$ byte	p	$-128$ to $127$
short	$2$ bytes	p	$-32,768$ to $32,768$
int	$4$ bytes	p	$-2$ billion to $2$ billion
long	$8$ bytes	p	$-9$ quintillion to $9$ quintillion
float	$4$ bytes	p	Fractional number up to $6-7$ digits [ $2.718281f$ ]
double	$8$ bytes	p	Fractional number up to $15$ digits [ $2.71828182845904$ ]
char	$2$ bytes	p	Single character/letter/ASCII value [ 'a' ]
string	varies	r (Reference)	A sequence of characters ["Carpe diem"]

Primitive vs. Reference Data Types

Primitive	Reference
Eight (8) types	Unlimited and user defined
Stores data	Stores and address
Holds only 1 value	Holds more than one value
Needs less memory	Needs more memory
Faster	Slower