This table shows the size and range of the primitive data types available in java.
| Type | Bits |
Range |
Object | Default | Notes | |
| min | max | |||||
| boolean | true | false | Boolean | false | ||
| byte | 8 | -27 | 27-1 | Byte | 0 | |
| short | 16 | -215 | 215-1 | Short | 0 | |
| char | 16 | 0 | 216 | Character | \u0000 | \uxxxx, xxxx 4 hex digit |
| int | 32 | -231 | 231-1 | Integer | 0 | Default integer type |
| long | 64 | -263 | 263-1 | Long | 0 | |
| float | 32 | -231 | 231-1 | Float | 0.0 | postfix letter l/L |
| double | 64 | -263 | 263-1 | Double | 0.0 | Default floating point type |
| reference | Null | |||||
The following table display examples of good and bad number formation.
| Type | Examples | |||
| Good | Bad | |||
| boolean | ||||
| byte | ||||
| short | ||||
| char | ‘\t”\342’
‘a’ int i = 5; char c = (char)i; |
‘\u05D0’0x980
4+6 |
‘436’“a”
3.4 |
0453“a string”
int i = 5; char c = i; |
| int | ||||
| long | ||||
| float | ||||
| double | 1.2345E02 | 1.2345e-6 | 1.2345 1e-6 | 1.2345 * 10^2 |
| reference | ||||
Octal and hexadecimal numbers:
- Octal number start with: 0 (zero);
- Hexadecimal numbers start with 0x or 0X (zero x);
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