Beginning Programming with Java For Dummies, 6th Edition
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The Java API (Application Programming Interface) has thousands of identifiers. Each identifier is the name of something (a class, an object, a method, or something like that). These identifiers include System, out, println, String, toString, JFrame, File, Scanner, next, nextInt, Exception, close, ArrayList, stream, JTextField, Math, Random, MenuItem, Month, parseInt, Query, Rectangle, Color, Oval, paint, Robot, SQLData, Stack, Queue, TimeZone, URL, and so many others.

You can reuse any of these names for any purpose in your code. But if you do, you might have trouble using a name with its normal meaning from the Java API. For example, you can write

int System = 7; java.lang.System.out.println(System); But you can't write

int System = 7;

System.out.println(System);

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Barry Burd, PhD, is a veteran author and educator. At the University of Illinois, he was named five times to the university-wide List of Teachers Ranked as Excellent by their Students. He has written several books on Java and Android development.

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