Constant variables

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"Constant variables" isn't a misnomer; they actually end up fairly useful to refer to values that don't change. Java indicates a variable can't change with the keyword final.

final double PI = 3.14159265;
final int MAX_CLASS_SIZE = 30;
final String TEACHER_NAME = "Charles Babbage";

final variables can receive one value. If you try to reassign the variable later, you'll get a compile-time error:

final int MAX_CLASS_SIZE = 30;
ERROR The final field MAX_CLASS_SIZE cannot be assigned

It's convention, but not required, that the names of final variables are written in capital letters, with words separated by an underscore (_). This style makes it clear to you and anyone reading your word that these variables can't change.

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