Chapter One considers some of the classes of the java.io package. Java defines input and output (I/O) in
terms of classes known as streams. Streams provide system input and output in a way that isolates the
developer from the details about how an operating system provides access to system resources for the
purposes of I/O. Streams are not required for input and output when a graphical user interface (GUI) is
used to capture and display information in an application. Graphical user interface design is examined in
Chapter Three.
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