Java™ How to Program, Seventh Edition

6.3. static Methods, static Fields and Class Math

As you know, every class provides methods that perform common tasks on objects of the class. For example, to input data from the keyboard, you have called methods on a Scanner object that was initialized in its constructor to obtain input from the standard input stream (System.in). As you’ll learn in Chapter 14, Files and Streams, you can initialize a Scanner to obtain input from other sources, such as a file on disk. One program could have a Scanner object that inputs information from the standard input stream and a second Scanner that inputs information from a file. Each input method called on the standard input stream Scanner would obtain input from the keyboard, and each input method called ...