Primitive data types : Java

The eight primitive data types in Java are:

• boolean, the type whose values are either true or false
• char, the character type whose values are 16-bit Unicode characters
• the arithmetic types:
  • the integral types:
    • byte
    • short
    • int
    • long
  • the floating-point types:
    • float
    • double

Values of class type are references. Strings are references to an instance of class String.

Boolean

Values of type boolean are not converted implicitly or explicitly (with casts) to any other type. But the programmer can easily write conversion code:

final int i = b?1:0;
final double d = b?1.0:0.0;
final boolean b = i>0?true:false;

Primitive data types in Java

Type	Description	Default	Size	Example Literals
boolean	true or false	false	1 bit	true, false
byte	twos complement integer	0	8 bits	(none)
char	Unicode character	\u0000	16 bits	'a', '\u0041', '\101', '\\', '\'', '\n', 'ß'
short	twos complement integer	0	16 bits	(none)
int	twos complement integer	0	32 bits	-2, -1, 0, 1, 2
long	twos complement integer	0	64 bits	-2L, -1L, 0L, 1L, 2L
float	IEEE 754 floating point	0.0	32 bits	1.23e100f, -1.23e-100f, .3f, 3.14F
double	IEEE 754 floating point	0.0	64 bits	1.23456e300d, -1.23456e-300d, 1e1d