解决方法
这是Java Notes在
autoboxing上说的：
Prefer primitive types
Use the primitive types where there is no need for objects for two
@H_404_14@
reasons.Primitive types may be a lot faster than the corresponding wrapper
types,and are never slower.The immutability (can’t be changed after creation) of the wrapper
types may make their use impossible.There can be some unexpected behavior involving == (compare references) and .equals() (compare values). See the reference below for examples.
