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How to use Java Generics

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I had a task to do some statistics by implementing two interfaces one to which defines a key and a value for the statistic and the other to define and visit a statistic collector, I have implemented the methods and done the required task but now I want to learn how to make my code generic so I have tried many ways but non of them worked for me, you can see my code below:

Here is the statistic interface:

Here is the StatisticsCollector interface:

And here is the implementations:



Can someone help please I have been trying and trying for days and nothing is working!
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nothing is working!

Please explain.

If you are getting error messages, please copy the full text and paste it here.
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