Web Reference: Sep 24, 2025 · Java IO API provides classes and methods to handle input and output operations efficiently. It allows reading data from various sources and writing data to different destinations, essential for almost all Java applications. This Java tutorial describes exceptions, basic input/output, concurrency, regular expressions, and the platform environment 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? What is its name or size?
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