http://blog.csdn.net/rabbit_in_android/article/details/49793813
| 基本类型 | 大小(字节) | 默认值 | 封装类 |
| byte | 1 | (byte)0 | Byte |
| short | 2 | (short)0 | Short |
| int | 4 | 0 | Integer |
| long | 8 | 0L | Long |
| float | 4 | 0.0f | Float |
| double | 8 | 0.0d | Double |
| boolean | - | false | Boolean |
| char | 2 | u0000(null) | Character |
| void | - | - | Void |