Why are 2 Long variables not equal with == operator in Java?

Question

I got a very strange problem when I\'m trying to compare 2 Long variables, they always show false and I can be sure they have the same number value by debugging in Eclipse:<

Answer 1

== compares references, .equals() compares values. These two Longs are objects, therefore object references are compared when using == operator.

However, note that in Long id1 = 123L; literal value 123L will be auto-boxed into a Long object using Long.valueOf(String), and internally, this process will use a LongCache which has a [-128,127] range, and 123 is in this range, which means, that the long object is cached, and these two are actually the same objects.