why -0.0 == 0.0 true ??? and

[shiren shah]

Hi all,
As we know this order of float/double values
-Infinity --> Negative Numbers/Fractions --> -0.0 --> +0.0 --> Positive Numbers/Fractions --> Infinity.
I could not undestand why
-0.0 == 0.0 // true
but
-0.0< 0.0 // false
and
Math.ceil(-0.0) // -0.0
Math.floor(-0.0) // -0.0

[Valentin Crettaz]

This is specified as such in the JLS, so they sure had a reason for deciding so.
JLS 4.2.3 Floating-Point Types, Formats, and Values

Positive zero and negative zero compare equal; thus the result of the expression 0.0==-0.0 is true and the result of 0.0>-0.0 is false.

HIH

[Rajinder Yadav]

As per the Java Language Spec.
Math.ceil() and Math.floor() both differentiate between -0.0. and 0.0