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Sams Teach Yourself Java in 21 Days, Sixth Edition

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Day 16. Serializing and Examining Objects

An essential concept of object-oriented programming is the representation of data. In an object-oriented language such as Java, an object represents two things:

• Behavior: The things an object can do

• Attributes: The data that differentiates the object from other objects

Combining behavior and attributes is a departure from other programming languages, where a program is defined as a set of instructions that manipulate data. The data is a separate thing, such as how word processing software is considered to be a program that creates and edits text documents. The data is separate from the software that manipulates it.

Object-oriented programming blurs the line between program and data. An object in a ...

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