Constants
The keyword final is used to indicate that something is a constant. For example:
final
double pi = 3.1415926;
final int
numberOfSidesInATriangle = 3;
The use of constants can make a program much
easier to understand, and prevent the programmer making errors which, although trivial,
are rather difficult to trace.
We have seen examples of constants used in the
BallWorld application from the previous unit. Constants were introduced to define the
width and height of the window the balls bounced within:
final
int frameWidth = 600;
final int frameHeight
= 400;
In fact, as they appeared in the application,
these constants were declared with two more keywords:
public
static final int frameWidth = 600;
public static final
int frameHeight = 400;
however, we shall leave investigation of the
keywords public and static until later units.
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