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Sorry, I don't see any specific questions about interfaces. The code in post#5 looks like the definition of an interface.
What questions do you have about interfaces after reading the tutorial?...

What questions do you have about interfaces after reading the tutorial?
Copy one of the examples from the tutorial, paste it here and ask some specific questions about the problems you are having...

What have you tried? Do you have any specific questions?

Take a look at the tutorial:
What Is an Interface? (The Java™ Tutorials > Learning the Java Language > Object-Oriented Programming...