Equality judgment of long type

         When I was working on the project today, I couldn't get the desired results , Finally, it was found that there was a problem with a judgment statement . There are two Long The initial assignment of variables of type is 10000, But with “==” To judge the result is to judge that they are not equal .

Long There is ⼀ A static inner class LongCache, special ⽤ It depends on the cache -128⾄127 Between the value of the ,⼀ common 256 Elements . If it's worth [-128, 127] Between , Will be put in the cache ⾥⾯, Use at this time “==” It can be judged that two variables are equal .⽽ Beyond this range, we have to new⼀ A new object , in other words "==" Cannot judge whether objects are equal .

        It was later changed to equals() To judge , Finally, it runs successfully .