Chapter One considers some of the classes of the 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
