hashmap questions =P

Okey ... so im creating a game now =P and I have some questions about hashmaps ... how can i messure the memory size of a hashmap ? And if im not misstaken ... hashmaps stores objects by reference so it does not save the objects in new memory space?


I have a list of objects and the objects knows their position... is there any way of checking if the mouse is over the objects that does not include any loop ? :P I was thinking of using the pixels in as a key in hashmap to get the object ... but i there must be better ways to do this? =) thanks guys

For the first one, get a profiler. For the second one, use a mouselistener.

I'm using a mouselistener ... but you still have to loop trough all objects to check witch object the mouse is over ...

Depends on what you are plotting and how. And how you organise your data, and possible "trigger" methods.