Web Reference: Dec 10, 2025 · Java I/O (Input/Output) is a collection of classes and streams in the java.io package that handle reading data from sources (like files, keyboard, or network) and writing data to destinations (like files, console or sockets). It provides both byte and character streams to support all types of data. Flow from Source to Destination This Java tutorial describes exceptions, basic input/output, concurrency, regular expressions, and the platform environment I/O Streams (Input/Output Streams) You've already seen how to create, read, and write simple text files. In Java, there is an important difference between working with the File class and working with I/O Streams (Input/Output Stream): The File class (from java.io) is used to get information about files and directories: Does the file exist?
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