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The
Java class library is huge. We will not cover it all today. In fact, the
remaining eight classes will focus mostly on the class library. However, I
do want to take this opportunity to look briefly at one useful class in
the library, java.lang.Math. This is a class which contains
static methods for performing many standard mathematical operations like
square roots and cosines. You will need it for many of this weeks
exercises.
The Math class
contains several dozen static methods. Recall that to use a static method
from a class, you just prefix its name with the name of the class followed
by a period. For instance
double x =
Math.sqrt(9.0);
Y ou never need to instantiate
the Math class directly. (In fact you can't. The Math()
constructor is declared private.) |