Java Primitive Data Types
In this chapter you will learn:
Java eight primitive types
Java defines eight primitive types of data:
byte
, short
, int
, long
, char
,
float
, double
, and boolean
.
Primitive Type | Reserved Word | Size | Min Value | Max Value |
---|---|---|---|---|
Boolean | boolean | N/A | N/A | N/A |
Character | char | 16-bit | Unicode 0 | Unicode 216 - 1 |
Byte integer | byte | 8-bit | -128 | +127 |
Short integer | short | 16-bit | -215 | +215 - 1 |
Integer | int | 32-bit | -231 | +231 - 1 |
Long integer | long | 64-bit | -263 | +263 - 1 |
Floating-point | float | 32-bit | 1.4e-045 | 3.4e+038 |
Double precision floating-point | double | 64-bit | 4.9e-324 | 1.8e+308 |
byte
, short
, int
, and long
are for
whole-valued signed numbers.
float
and double
are fractional precision numbers.
char
represents symbols in a character set, like letters and numbers.
boolean
represents true
/false
values.
Java Integers
Java defines four integer types: byte
, short
, int
, and long
.
Integer types are signed and can have positive and negative values.
The width and ranges of these integer types vary widely:
Name | Width | Range |
---|---|---|
long | 64 | -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 |
int | 32 | -2,147,483,648 to 2,147,483,647 |
short | 16 | -32,768 to 32,767 |
byte | 8 | -128 to 127 |
Floating Point Types
There are two kinds of floating-point types: float
and double
.
float
type represents single-precision numbers.
double
type stores double-precision numbers.
Floating-Point Types width and ranges are shown here:
Name | Width in Bits | Approximate Range |
---|---|---|
double | 64 | 4.9e-324 to 1.8e+308 |
float | 32 | 1.4e-045 to 3.4e+038 |
Next chapter...
What you will learn in the next chapter:
- What is Java boolean type
- Values for Java boolean type
- Literals for Java boolean type
- Java Boolean class
- Example - Java boolean type
- Example - How to create boolean Literals