This table shows the size and range of the primitive data types available in java.

Type	Bits	Range		Object	Default	Notes
		min	max
boolean		true	false	Boolean	false
byte	8	-27	27-1	Byte	0
short	16	-215	215-1	Short	0
char	16	0	216	Character	\u0000	\uxxxx, xxxx 4 hex digit
int	32	-231	231-1	Integer	0	Default integer type
long	64	-263	263-1	Long	0
float	32	-231	231-1	Float	0.0	postfix letter l/L
double	64	-263	263-1	Double	0.0	Default floating point type
reference					Null

The following table display examples of good and bad number formation.

Type	Examples
	Good		Bad
boolean
byte
short
char	‘\t”\342’ ‘a’ int i = 5; char c = (char)i;	‘\u05D0’0x980 4+6	‘436’“a” 3.4	0453“a string” int i = 5; char c = i;
int
long
float
double	1.2345E02	1.2345e-6	1.2345 1e-6	1.2345 * 10^2
reference

Octal and hexadecimal numbers:

• Octal number start with: 0 (zero);
• Hexadecimal numbers start with 0x or 0X (zero x);