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Understanding Object-Oriented Programming Paradigms and Inheritance Hierarchy

Delve into the nuances of prototype-based vs class-based OOP, inheritance variations, access control, and method implementation in a comprehensive guide for aspiring programmers. Explore critical concepts like class instances, static vs dynamic fields, and the intricacies of inheritance hierarchy.

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Understanding Object-Oriented Programming Paradigms and Inheritance Hierarchy

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  1. Object Oriented Programming • Prototype based vs class based OOP • Prototype based OOP • - cloning, virtual and copied fields and methods • SELF • Problems: code is not shared, too dynamic

  2. Class based OOP • Classes vs instances • Only classes have code • Only classes inherit • Instances have state variables • Variations in instances implemented as values of state variables.

  3. Inheritance • Type vs Implementation inheritance • Types: roles that an object can have -> INTERFACES • Organized as a DAG i.e. multiple inheritance for types is relatively trouble free. • Classes: implement code – single inheritance: • controls complexity • adds security

  4. Accessibility of methods and variables in a class • Final • Ex: security manager • Public,private,protected,default • Absolute: public, private • Dependent on Packages: default, protected

  5. Class vs instance (Static vs. dynamic) fields/vars and methods • Class variables: shared among all instance – visible to all instances • Ex: instance counter • Ex: security manager – final!

  6. Inheriting Methods • Virtual methods – all java instance methods are virtual • Extra (hidden) parameter: this • search for an absent method or field always starts from the class associated with “this” • Ex: Circle extends Point -> hide(), show(), moveTo(x,y) – virtual, uses hide() and show() as defined based on the “this” parameter

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