Java Reference by Smart Soft

Java Data Types

Integral Types	byte	1 byte	from -128 to 127, inclusive
	short	2 byte	from -32768 to 32767, inclusive
	int	4 byte	from -2147483648 to 2147483647, inclusive
	long	8 byte	from -9223372036854775808 to 9223372036854775807, inclusive
Floating Point Types	float	4 bytes	See note
Floating Point Types	double	8 bytes	See note
Other Types	char	2 bytes	from '\u0000' to '\uffff' inclusive, that is, from 0 to 65535
Other Types	boolean	n/a	true or false

Char

Technically, a char is an integral type, since chars are unicode integer values that represent characters.

The range of float is determined by the following formula:

s * m * 2^e

where:
  s is -1 or +1
  m is from 0 to 2^34
  e is from -149 to 104

The range of double is determined by the same formula:

where:
  s is -1 or +1
  m is from 0 to 2^53
  e is from -1075 and 970