Java float comparison is not working even with Float.compare

I have _allowedPercentageDiscount = 0.0 and perentageDiscount = 1.0, First I tried with

if(_allowedPercentageDiscount < percentageDiscount)
//do something

but it never result true. Then, after some search, I tried with Float.compare but it still did not result true. Magically it gives correct result in evaluation window. (Android Studio).

What the hell is wrong and what to do?