From : http://java.boot.by/scjp-tiger/
Develop code that implements "is-a" and/or "has-a" relationships.
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Develop code that implements "is-a" and/or "has-a" relationships.

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Given a scenario, develop code that declares and/or invokes overridden or overloaded methods and code that declares and/or invokes superclass, overridden, or overloaded constructors.  Home Chapter 6. Collections / Generics