This document discusses object-oriented programming and some key concepts like classes, objects, and methods. It explains that the main body of a program uses classes and objects, and that classes can contain methods which can be called on objects or directly from the class itself as class methods. The document was last updated on June 1, 2021.

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2. OOP Object-Oriented
Programming
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2. main
body
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5. Method Class (Class Method )
method Static
Object
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3. Object
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