Beginning Programming with Java For Dummies
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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;


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Dr. Barry Burd holds an M.S. in Computer Science from Rutgers University and a Ph.D. in Mathematics from the University of Illinois. Barry is also the author of Beginning Programming with Java For Dummies, Java for Android For Dummies, and Flutter For Dummies.

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