Comparing doubles

Can i just use the standard methods( <= etc)

 

Yes, except for ==.
Decimal values can't be stored correctly in a binary number, e.g. 0.1 is stored as something like 0.0999945325. Because of this you might not always get what you expect, but something similar.
Thus is you want to test two doubles (a & b) for equality you should use if (Math.abs(a - b) < 1e-40) (1e-40 is a very small number)

 

Njol
Or Double.compare(a, b) == 0 ?

 

No, because even -0 and 0 are different for this method:

 

I always tell people this, but you should only use doubles when you have very long decimal datatypes, otherwise just use floats
But, do what the first reply said to compare them