This section begins with a discussion of theNumber
class in thejava.lang
package, its subclasses, and the situations where you would use instantiations of these classes rather than the primitive number types.This section also presents the
PrintStream
andDecimalFormat
classes, which provide methods for writing formatted numerical output.Finally, the
Math
class injava.lang
is discussed. It contains mathematical functions to complement the operators built into the language. This class has methods for the trigonometric functions, exponential functions, and so forth.