| Primitive type | Size | Minimum | Maximum | Wrapper type |
| boolean | 1-bit | Boolean | ||
| char | 16-bit | Unicode 0 | Unicode 65535 | Character |
| byte | 8-bit | -128 | +127 | Byte |
| short | 16-bit | -32768 | 32768 | Short |
| int | 32-bit | Integer | ||
| long | 64-bit | Long | ||
| float | 32-bit | IEEE754 | IEEE754 | Float |
| double | 64-bit | IEEE754 | IEEE754 | Double |
| void | Void |
所有的数字类型都是有符号的。