Is it possible to know at runtime when Garbage collection is occuring?

Basically, I am using achartengine for a charting application. It seems like i have a memory leak somewhere so garbage collection is occuring somewhat often. The problem is, whenever GC occurs, it messes up my chart. I can call repaint() to fix it, but I would need to know when GC.

Image of the messed up char开发者_高级运维t below

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Each Java Object have a method finalize() which is called just before the GC try to "delete" the object. example

Hope this help.