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Java 的变量类型：
| 主类型 | 大小 | 最小值 | 最大值 | 封装器类型 |
| boolean | — | — | — | Boolean |
| Char | 16-bit | Unicode 0 | Unicode 216- 1 | Character |
| byte | 8-bit | -128 | 127 | Byte |
| Short | 16-bit | -215 | +215—1 | Short |
| Int | 32-bit | -231 | +231—1 | Integer |
| Long | 64-bit | -263 | +263—1 | Long |
| Float | 32-bit | IEEE754 | IEEE754 | Float |
| double | 64-bit | IEEE754 | IEEE754 | Double |
| Void | — | — | — | Void |