Android™ How to Program, Second Edition

The java.io Package

Java programs perform file processing by using classes from package java.io. This package includes definitions for stream classes, such as FileInputStream (for byte-based input from a file), FileOutputStream (for byte-based output to a file), FileReader (for character- based input from a file) and FileWriter (for character-based output to a file), which inherit from classes InputStream, OutputStream, Reader and Writer, respectively. Thus, the methods of the these stream classes can also be applied to file streams.

Java contains classes that enable you to perform input and output of objects or variables of primitive data types. The data will still be stored as bytes or characters behind the scenes, allowing you to read or write ...