Oracle : Object Types

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Object types define how to store data and define API operations, also known as method functions or procedures. Object types are also known as classes in many OO programming languages. Object types mirror that of an PL/SQL package, an object body implements the object type just as a package body implements a package specification. The object type hides the operation details known as encapsulation and also masks the complexity known as abstraction. The current method for visually representing object types is generally done in UML (Unified Modeling Language).
OO programming has two types of API interfaces in object types

Static : static methods allow you to access object type variables and methods without creating an instance of a class, static vaiables in PL/SQL are not available. you can implement static methods like package functions and procedures.    more...