* The foundation of the Java Programming language
* Based on a few concepts: abstraction, state and behavior (data and methods) and encapsulation (information hiding)
* Advantages:
* Reusable
* Easy to maintain
* Faster package development
* Produce high-quality programs
* Easy to adapt and easy to scale

* identify to understanding object-oriented technology
* Real-world objects that share two characteristics: state (data) and behavior (methods)
A software bundle of variables and related methods


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* Non-specific position c eachs for objects to perform operations
* Sent to an object to perform an operation in an object-oriented environment
* Provides two important benefits:
* An objects behavior verbalised through its methods, so (aside from direct variable access) pass on pass(a) supports all possible interactions between objects
* Objects dont motif to be in the same process or even up on the same machine to send and receive messages top and forth to each other
* When object A wants object B to perform one of Bs methods, object A sends a message to object B

* Components of a message
* The object to which the message is addressed
* The name of the method to perform
* Any parameters needed by the method

* A mechanism used to distinguish one type of object from another
* A blueprint, or prototype, that defines the variables and the methods greens to all objects of a certain kind
* Set of objects that share a common bodily structure and a common behavior
* A specification of structure (instance variables), behavior (methods), and inheritance objects
* Its role is to define the properties and procedures (the state and behavior) and applicability of its instance
* Example: class car defines the property color that the measure of maroon, yellow or white

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