How to use the System.nanoTime() ?

I've got a big trouble. I need to create a class with a lot of methods, each method does something, like draw squares, circles, calculate Fibonacci series, and so on. But the problem is:
1 - I need to use System.nanoTime() to calculate the time each method takes to execute and finalize its problem and compare to the time of the other methods.
Any sugestions?
Apreciate your help.
Thanks.

Yeah, sounded too simple, but I'm still wrapped. Could you please show me some code, where I have a method and the System.nanoTime() calculates the time this method takes to execute? It would be great if the method tha uses System.nanoTime() would be a abstract method, so I could use it in other methods for calculating their execution time...
Thanks a lot!

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