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public interface Comparable

This interface imposes a total ordering on the objects of each class that implements it. This ordering is referred to as the class's natural ordering, and the class's...

I am not sure whether I understood your question or not!!.

But I want to share with you something.

If you want to make a class or method that can not be extended by other
classes....

Purpose of finally block :

--> The finally block is self explanatory(finallyyyyyy).

--> The piece of code which you want to execute after come out of
statements in try block must...