By Yakov Fain

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Only after this part is done, they start writing Java code. Classes and Objects Classes in Java may have methods and attributes. Methods define actions that a class can perform. Attributes describe the class. Let’s create and discuss a class named VideoGame. This class may have several methods, which can tell what objects of this class can do: start the game, stop it, save the score, and so on. This class also may have some attributes or properties: price, screen color, number of remote controls and others.

If you declare a variable inside any method, such variable is called local. This means that this variable is available only for the code within this method. When the method completes, this variable automatically gets removed from memory. Java Programming for Kids, Parents and Grandparents 47 Programmers also use the word scope to say how long a variable will live, for example you can say that the variables declared inside a method have a local scope. If a variable has to be reused by several method calls, or it has to be visible from more than one method in a class, you should declare such variable outside of any method.

In addition to the word class, you’ll have to get used to the new meaning of the word object. The phrase “to create an instance of an object” means to create a copy of this object in the computer’s memory according to the definition of its class. A factory description of the GameBoy Advance relates to an actual game the same way as a Java class relates to its instance in memory. The process of building actual games based on this description in the game factory is similar to the process of creating instances of GameBoy objects in Java.

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Java Programming for Kids, Parents and Grandparents by Yakov Fain
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