Web Reference: In this lesson, we'll see streams that can handle all kinds of data, from primitive values to advanced objects. The data source and data destination pictured above can be anything that holds, generates, or consumes data. Sep 24, 2025 · Java supports standard I/O like C/C++, with three streams: System.in (input), System.out (output) and System.err (error). Standard Input : The Standard Input class is used to accept input data to the user's program. 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:
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