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• A class is a template from which objects may be created. – Can have any number of instances (objects). • An object contains state (data) and behavior (methods). • Methods of an object collectively characterize its behavior. – Methods can only be invoked by sending messages to an object. – Behavior is shared among objects.
Object-oriented programming is our introduction to data abstraction. We em-phasize the concepts of a data type (a set of values and a set of operations on them) and an object (an entity that holds a data-type value) and their implementation using Java’s class mechanism. We teach students how to use, create, and design data types.
you will walk through object-oriented programming by example; learning to use a simple object, examining the definition, extending the definition, and then designing your own object.
You have learned how to structure your programs by decomposing your tasks into methods. This has made your code more modular and increases code re-use. Object Oriented Programming (OOP) is a style of programming which further decomposes your code into discrete interacting objects.
Java is based on the concept of object-oriented programming. As the name suggests, at the center of it all is an object. Objects contain both data and the functionality that operates on that data. This is controlled by the following four paradigms •
9 lut 2021 · Objects –review •An object is a bundle of state and behavior •State –the data contained in the object –Stored in the fields of the object •Behavior –the actions supported by the object –Provided by methods •Method is just OO-speak for function •Invoke a method = call a function
The Object-Oriented Paradigm and Java 13
