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. Package java.io Provides for system input and output through data streams, serialization and the file system. In 2002, with Java SE 1.4, Java NIO was released, with new classes, concepts and features. NIO stands for Non-blocking Input/Output, which summarizes the main features brought by this extension.
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