Web Reference: Package java.io Provides for system input and output through data streams, serialization and the file system. Jul 23, 2025 · This package provides for system input and output through data streams, serialization and the file system. Unless otherwise noted, passing a null argument to a constructor or method in any class or interface in this package will cause a NullPointerException to be thrown. The java.io package is a standard package of Java SDK. It contains classes for system input and output through data streams, serialization and the file system. This package is very useful as it provides streams to handle input from various sources like keyboard, file system, network etc. On similar patterns, this package has stream classes to write...
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