Object Oriented Programming
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| object oriented programming system | object, class, inheritance, polymorphism, abstraction, encapsulation
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| object | entity with state and behavior
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| class | blueprint for objects, data types and methods
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| object oriented pillars | inheritance, polymorphism, encapsulation, abstraction
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| inheritance | gives one class access to states and behaviors of another but can extend only one class
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| polymorphism | means to take on many forms and refers to an is a relationship
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| method overloading | multiple methods has same name but different parameters
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| method overriding | child class has same methods as parent class
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| encapsulation | puts code and data together, makes all data types private and uses getters and setters
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| abstraction | hide implementation and show functionality
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| generalization | gets shared methods from two or more classes and puts them in a generalized class
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| specialization | creates new subclasses into an existing class
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| protected keyword | only visible within current and child classes
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| private keyword | visible within current class
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| public | visible to all classes
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