Double in HashMap

Question

I was thinking of using a Double as the key to a HashMap but I know floating point comparisons are unsafe, that got me thinking. Is the equals method on the Double class als

Answer 1

The hash of the double is used, not the double itself.

Edit: Thanks, Jon, I actually didn't know that.

I'm not sure about this (you should just look at the source code of the Double object) but I would think any issues with floating point comparisons would be taken care of for you.