Numbers - Java Tutorial 5.0 英文版

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Numbers

This section begins with a discussion of the Number class in java.lang and its subclasses. In particular, this section talks about the rare situations that you might use these classes instead of the primitive number classes, points out the common methods and class variables they have in common, and shows you how to convert instances to strings.

Additionally, this section talks about other classes you might need to work with numbers. For instance, if you need to display a number in a particular format, you can use the NumberFormat and DecimalFormat classes in java.text to format them. Also, the format facility of PrintStream and PrintWriter provides convenient methods for writing a formatted string to an output stream.

Finally, the Math class in java.lang contains mathematical functions to complement the operators built-in to the language. This class has methods for the trigonometric functions, exponential functions, and so on.

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