what this code returns true

[kavitha satteli]

(0.0 == -0.0)

[dhwani mathur]

hi thr

i dont know if i got your doubt or not
but will say
since the values +0.0 and -0.0 are identical
or same so it returns true..............
if you have some other doubt do let us know
please be specific with your doubt....?

[Kelvin Chenhao Lim]

In mathematical terms, +0.0 and -0.0 are the same, so that's why Java defines that comparison to return true. As you may know, it is true that +0.0 and -0.0 have different underlying bit representations, but you can't distinguish between them using the == operator.

However, the Double class does distinguish between the two, so this will print false:

Double n1 = -0.0;
Double n2 = +0.0;
System.out.println(n1.equals(n2));