学习java肯定会涉及到“封箱”和“拆箱”，那么什么是“封箱”和“拆箱呢？我相信有不少的老师或者作者都对此做过总结，在这里就不详细说了。总的来说就是：装箱就是自动将基本数据类型转换为包装器类型；拆箱就是自动将包装器类型转换为基本数据类型。一共有八种基本数据类型都有对应“封箱”他们分别是：

基本数据类型                                             包装类

byte                                                            Byte

boolean                                                      Boolean

short                                                           Short

char                                                            Character

int                                                               Integer

long                                                            Long

float                                                            Float

double                                                        Double