java - 状态标识(比如0和1)，用int好,还是有其他选择了？

Question

状态标识(比如0和1)，用int好,还是有其他选择了？ 比如short

比如 状态有1和0
int flag=1
short flag=1
这两个那个会好一些了？

Answer 1

If you only use it to express status, there is no difference between short and int. If you don’t believe me, you can compile it and look at the bytecode.

Code

int flag = 1;
short flag = 1;

and code

int flag = 1;
int flag = 1;

The resulting bytecode is exactly the same! You will get the following bytecode,

         0: iconst_1
         1: istore_1
         2: iconst_1
         3: istore_2

Answer 2

Depending on your usage scenario, if it is used for object attributes or SQL parameters, it is best to use Integer. Because you may not initialize it, using int will have a default value of 0 (this 0 may not be what you want)

Answer 3

If the status only has 0 and 1, you can use boolean（true 或 false） 或者 byte（0 或 1，byte 的范围在 -128 ~ 127）；状态如果较多，更推荐用 enum

Answer 4

Both boolean and int are available. There is no difference.