OOP Demystified
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Encapsulation is a technique of linking together attributes and procedures to form an object.
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Encapsulation enables a programmer to institute checks and balances by placing attributes and procedures in a class and then defining rules in the class to control its access.
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An access specifier is a programming language keyword that tells the computer what part of the application can access data and functions/ methods defined within the access specifier.
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The public access specifier determines attributes and procedures that are accessible by using an instance of the class.
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The private access specifier identifies attributes and procedures that are only accessible by a procedure that is defined by the class.
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The protected access specifier stipulates attributes and procedures that can be inherited and used by another class.
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A subclass inherits public and protected portions of the super class.
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In C++, access specifiers define a section of a class that contains attributes and member functions. In Java, each attribute and member method contains the access specifier.
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A super class cannot access any portion of a subclass.
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Programmers require that some attributes of a class be accessed only by a member procedure in order to validate values assigned to attributes. A programmer who wants access to some attributes calls a member procedure, which applies any validation rules before assigning values to attributes.
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