10.6 Network Communication with Streams
Since in order to speak, one must first listen, learn to speak by listening.
—MEVLANA RUMI
We have seen that the Scanner class can be used to read data from a file or from the keyboard. Amazingly, classes such as Scanner and PrintWriter can be used with any kind of data stream! To illustrate this flexibility, here we introduce communication over a network using streams. As you will see, the code is nearly identical to reading from or writing to a file except instead the program will be reading from or sending to a computer on the Internet. This level of abstraction is made possible thanks to the principle of polymorphism discussed in Chapter 8.
When computers want to communicate ...
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