- There are two categories of data types
- Primitive types
- Non primitive types
- Java provides eight primitive types of data:
| Byte | Short | Int | Long | Char | Float | Double | Boolean |
- The primitive types are also known as simple or basic data types.
- These can be represented in four groups:
| Integer | Floating-point numbers |
| Characters | Boolean |
Integer
- Java provides four integer types: byte, short, int, long.
- All of these are signed, positive and negative values.
| Type | Size/bytes | Range |
| Byte | 8 | -128 to 127 |
| Short | 16 | -32,768 to 32,767 |
| Int | 32 | -2,147,483,648 to 2,147,483,647 |
| Long | 64 | -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 |
Floating-Point Types
- Floating-Point or real numbers are used when we requires fractional precision for evaluating arithmetic calculations.
- There are two kinds of floating-point types, float and double, which represent single and double-precision numbers, respectively.
| Type | Size/bytes | Range |
| Float | 32 | 1.4e – 045 to 3.4e + 038 |
| Double | 64 | 4.9e – 324 to 1.8e + 308 |
Character
- It is used to store characters.
| Type | Size/bytes | Range |
| Char | 16 | 0 to 65,536 |
Boolean
- It is used to store logical values either True or False.
| Type | Size/bytes | Range |
| Boolean | 1 | True/False |