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). In this tutorial, you will learn simple ways to display output to users and take input from users in Java. We will use the print () method to display output and the Scanner class to take input. Java provides strong but flexible support for I/O related to files and networks but this tutorial covers very basic functionality related to streams and I/O. We will see the most commonly used examples one by one −. Java byte streams are used to perform input and output of 8-bit bytes.
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