Let's introduce another of the standard classes. This one is called java.lang.Math and it has a couple of dozen useful mathematical functions and constants, including trig routines (watch out—these expect an argument in radians, not degrees), pseudorandom numbers, square root, rounding, and the constants pi and e.
There are two methods in Math to convert between degrees and radians:
public static double toDegrees(double); // new in JDK 1.2public static double toRadians(double); // new in JDK 1.2
You'll need these when you call the trig functions if your measurements are in degrees.
You can review the source of the Math package at $JAVAHOME/src/java/lang/Math.java and in the browser looking at the Java API.