Java Language Tutorial => Primitive Types Cheatsheet

Example

Table showing size and values range of all primitive types:

data type	numeric representation	range of values	default value
boolean	n/a	false and true	false
byte	8-bit signed	-2⁷ to 2⁷ - 1	0
		-128 to +127
short	16-bit signed	-2¹⁵ to 2¹⁵ - 1	0
		-32,768 to +32,767
int	32-bit signed	-2³¹ to 2³¹ - 1	0
		-2,147,483,648 to +2,147,483,647
long	64-bit signed	-2⁶³ to 2⁶³ - 1	0L
		-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
float	32-bit floating point	1.401298464e-45 to 3.402823466e+38 (positive or negative)	0.0F
double	64-bit floating point	4.94065645841246544e-324d to 1.79769313486231570e+308d (positive or negative)	0.0D
char	16-bit unsigned	0 to 2¹⁶ - 1	0
		0 to 65,535

Notes:

The Java Language Specification mandates that signed integral types (byte through long) use binary twos-complement representation, and the floating point types use standard IEE 754 binary floating point representations.
Java 8 and later provide methods to perform unsigned arithmetic operations on int and long. While these methods allow a program to treat values of the respective types as unsigned, the types remain signed types.
The smallest floating point shown above are subnormal; i.e. they have less precision than a normal value. The smallest normal numbers are 1.175494351e−38 and 2.2250738585072014e−308
A char conventionally represents a Unicode / UTF-16 code unit.
Although a boolean contains just one bit of information, its size in memory varies depending on the Java Virtual Machine implementation (see boolean type).

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