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Thank you very much. I'm an old Cobol programmer (30+ years) trying to understand new technologies. I appreciate your help!

Hello! Thanks for your reply. Being a beginner I have to ask you a simple question. What does this code do? Is there a method called Drivable in
Arraylist? What does (new Car()); do? What does...

If I create an interface called 'abc' with these 3 methods, public void display() ; public void print() ; public void sample() ; and I implement them into class 'def' and display them, why do I need...