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Polymorphism, Interfaces and Abstraction, Generics, Iterators and Comparators, Enums and Attributes, Objects Communication and Events, Reflection, Unit Testing, Open/Closed and Liskov Principle.
Polymorphism, Interfaces and Abstraction, Generics, Iterators and Comparators, Enums and Attributes, Objects Communication and Events, Reflection, Unit Testing, Open/Closed and Liskov Principle.