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## Uses of Class
java.io.FileDescriptor

Packages that use FileDescriptor
java.io | Provides for system input and output through data streams, serialization and the file system.
java.lang | Provides classes that are fundamental to the design of the Java programming language.
java.net | Provides the classes for implementing networking applications.

Uses of FileDescriptor in java.io

Fields in java.io declared as FileDescriptor
`static FileDescriptor` | `FileDescriptor.in` A handle to the standard input stream.
`static FileDescriptor` | `FileDescriptor.out` A handle to the standard output stream.
`static FileDescriptor` | `FileDescriptor.err` A handle to the standard error stream.

Methods in java.io that return FileDescriptor
`FileDescriptor` | `RandomAccessFile.getFD()` Returns the opaque file descriptor object associated with this stream.
`FileDescriptor` | `FileOutputStream.getFD()` Returns the file descriptor associated with this stream.
`FileDescriptor` | `FileInputStream.getFD()` Returns the `FileDescriptor` object that represents the connection to the actual file in the file system being used by this `FileInputStream`.

Constructors in java.io with parameters of type FileDescriptor
`FileWriter(FileDescriptor fd)` Constructs a FileWriter object associated with a file descriptor.
`FileReader(FileDescriptor fd)` Creates a new `FileReader`, given the `FileDescriptor` to read from.
`FileOutputStream(FileDescriptor fdObj)` Creates an output file stream to write to the specified file descriptor, which represents an existing connection to an actual file in the file system.
`FileInputStream(FileDescriptor fdObj)` Creates a `FileInputStream` by using the file descriptor `fdObj`, which represents an existing connection to an actual file in the file system.

Uses of FileDescriptor in java.lang

Methods in java.lang with parameters of type FileDescriptor
`void` | `SecurityManager.checkRead(FileDescriptor fd)` Throws a `SecurityException` if the calling thread is not allowed to read from the specified file descriptor.
`void` | `SecurityManager.checkWrite(FileDescriptor fd)` Throws a `SecurityException` if the calling thread is not allowed to write to the specified file descriptor.

Uses of FileDescriptor in java.net

Fields in java.net declared as FileDescriptor
`protected FileDescriptor` | `SocketImpl.fd` The file descriptor object for this socket.
`protected FileDescriptor` | `DatagramSocketImpl.fd` The file descriptor object.

Methods in java.net that return FileDescriptor
`protected FileDescriptor` | `SocketImpl.getFileDescriptor()` Returns the value of this socket's `fd` field.
`protected FileDescriptor` | `DatagramSocketImpl.getFileDescriptor()` Gets the datagram socket file descriptor.

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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