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OCA: Oracle Certified Associate Java SE 8 Programmer I Study Guide: Exam 1Z0-808
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In Java programs, classes are the basic building blocks. When defining a class, you describe all the parts and characteristics of one of those building blocks. To use most classes, you have to create objects. An object is a runtime instance of a class in memory. All the various objects of all the different classes represent the state of your program.
In the following sections, we'll look at fields, methods, and comments. We'll also explore the relationship between classes and files.
Java classes have two primary elements: methods, often called functions or procedures in other languages, and fields, more generally known as variables. Together these are called the members of the class. Variables hold the state of the program, and methods operate on that state. If the change is important to remember, a variable stores that change. That's all classes really do. It's the programmer who creates and arranges these...
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