IT. Expert System.

Java Standard Edition (SE)

io


Package java.io

Provides for system input and output through data streams, serialization and the file system.

See: Description

  • Interface Summary 
    Interface Description
    Closeable
    A Closeable is a source or destination of data that can be closed.
    DataInput
    The DataInput interface provides for reading bytes from a binary stream and reconstructing from them data in any of the Java primitive types.
    DataOutput
    The DataOutput interface provides for converting data from any of the Java primitive types to a series of bytes and writing these bytes to a binary stream.
    Externalizable
    Only the identity of the class of an Externalizable instance is written in the serialization stream and it is the responsibility of the class to save and restore the contents of its instances.
    FileFilter
    A filter for abstract pathnames.
    FilenameFilter
    Instances of classes that implement this interface are used to filter filenames.
    Flushable
    A Flushable is a destination of data that can be flushed.
    ObjectInput
    ObjectInput extends the DataInput interface to include the reading of objects.
    ObjectInputValidation
    Callback interface to allow validation of objects within a graph.
    ObjectOutput
    ObjectOutput extends the DataOutput interface to include writing of objects.
    ObjectStreamConstants
    Constants written into the Object Serialization Stream.
    Serializable
    Serializability of a class is enabled by the class implementing the java.io.Serializable interface.
  • Class Summary 
    Class Description
    BufferedInputStream
    A BufferedInputStream adds functionality to another input stream-namely, the ability to buffer the input and to support the mark and reset methods.
    BufferedOutputStream
    The class implements a buffered output stream.
    BufferedReader
    Reads text from a character-input stream, buffering characters so as to provide for the efficient reading of characters, arrays, and lines.
    BufferedWriter
    Writes text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings.
    ByteArrayInputStream
    A ByteArrayInputStream contains an internal buffer that contains bytes that may be read from the stream.
    ByteArrayOutputStream
    This class implements an output stream in which the data is written into a byte array.
    CharArrayReader
    This class implements a character buffer that can be used as a character-input stream.
    CharArrayWriter
    This class implements a character buffer that can be used as an Writer.
    Console
    Methods to access the character-based console device, if any, associated with the current Java virtual machine.
    DataInputStream
    A data input stream lets an application read primitive Java data types from an underlying input stream in a machine-independent way.
    DataOutputStream
    A data output stream lets an application write primitive Java data types to an output stream in a portable way.
    File
    An abstract representation of file and directory pathnames.
    FileDescriptor
    Instances of the file descriptor class serve as an opaque handle to the underlying machine-specific structure representing an open file, an open socket, or another source or sink of bytes.
    FileInputStream
    A FileInputStream obtains input bytes from a file in a file system.
    FileOutputStream
    A file output stream is an output stream for writing data to a File or to a FileDescriptor.
    FilePermission
    This class represents access to a file or directory.
    FileReader
    Convenience class for reading character files.
    FileWriter
    Convenience class for writing character files.
    FilterInputStream
    A FilterInputStream contains some other input stream, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
    FilterOutputStream
    This class is the superclass of all classes that filter output streams.
    FilterReader
    Abstract class for reading filtered character streams.
    FilterWriter
    Abstract class for writing filtered character streams.
    InputStream
    This abstract class is the superclass of all classes representing an input stream of bytes.
    InputStreamReader
    An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset.
    LineNumberInputStream Deprecated
    This class incorrectly assumes that bytes adequately represent characters.
    LineNumberReader
    A buffered character-input stream that keeps track of line numbers.
    ObjectInputStream
    An ObjectInputStream deserializes primitive data and objects previously written using an ObjectOutputStream.
    ObjectInputStream.GetField
    Provide access to the persistent fields read from the input stream.
    ObjectOutputStream
    An ObjectOutputStream writes primitive data types and graphs of Java objects to an OutputStream.
    ObjectOutputStream.PutField
    Provide programmatic access to the persistent fields to be written to ObjectOutput.
    ObjectStreamClass
    Serialization's descriptor for classes.
    ObjectStreamField
    A description of a Serializable field from a Serializable class.
    OutputStream
    This abstract class is the superclass of all classes representing an output stream of bytes.
    OutputStreamWriter
    An OutputStreamWriter is a bridge from character streams to byte streams: Characters written to it are encoded into bytes using a specified charset.
    PipedInputStream
    A piped input stream should be connected to a piped output stream; the piped input stream then provides whatever data bytes are written to the piped output stream.
    PipedOutputStream
    A piped output stream can be connected to a piped input stream to create a communications pipe.
    PipedReader
    Piped character-input streams.
    PipedWriter
    Piped character-output streams.
    PrintStream
    A PrintStream adds functionality to another output stream, namely the ability to print representations of various data values conveniently.
    PrintWriter
    Prints formatted representations of objects to a text-output stream.
    PushbackInputStream
    A PushbackInputStream adds functionality to another input stream, namely the ability to "push back" or "unread" one byte.
    PushbackReader
    A character-stream reader that allows characters to be pushed back into the stream.
    RandomAccessFile
    Instances of this class support both reading and writing to a random access file.
    Reader
    Abstract class for reading character streams.
    SequenceInputStream
    A SequenceInputStream represents the logical concatenation of other input streams.
    SerializablePermission
    This class is for Serializable permissions.
    StreamTokenizer
    The StreamTokenizer class takes an input stream and parses it into "tokens", allowing the tokens to be read one at a time.
    StringBufferInputStream Deprecated
    This class does not properly convert characters into bytes.
    StringReader
    A character stream whose source is a string.
    StringWriter
    A character stream that collects its output in a string buffer, which can then be used to construct a string.
    Writer
    Abstract class for writing to character streams.
  • Exception Summary 
    Exception Description
    CharConversionException
    Base class for character conversion exceptions.
    EOFException
    Signals that an end of file or end of stream has been reached unexpectedly during input.
    FileNotFoundException
    Signals that an attempt to open the file denoted by a specified pathname has failed.
    InterruptedIOException
    Signals that an I/O operation has been interrupted.
    InvalidClassException
    Thrown when the Serialization runtime detects one of the following problems with a Class.
    InvalidObjectException
    Indicates that one or more deserialized objects failed validation tests.
    IOException
    Signals that an I/O exception of some sort has occurred.
    NotActiveException
    Thrown when serialization or deserialization is not active.
    NotSerializableException
    Thrown when an instance is required to have a Serializable interface.
    ObjectStreamException
    Superclass of all exceptions specific to Object Stream classes.
    OptionalDataException
    Exception indicating the failure of an object read operation due to unread primitive data, or the end of data belonging to a serialized object in the stream.
    StreamCorruptedException
    Thrown when control information that was read from an object stream violates internal consistency checks.
    SyncFailedException
    Signals that a sync operation has failed.
    UncheckedIOException
    Wraps an IOException with an unchecked exception.
    UnsupportedEncodingException
    The Character Encoding is not supported.
    UTFDataFormatException
    Signals that a malformed string in modified UTF-8 format has been read in a data input stream or by any class that implements the data input interface.
    WriteAbortedException
    Signals that one of the ObjectStreamExceptions was thrown during a write operation.
  • Error Summary 
    Error Description
    IOError
    Thrown when a serious I/O error has occurred.

Package java.io Description

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.

Package Specification

Related Documentation

For overviews, tutorials, examples, guides, and tool documentation, please see:
Since:
JDK1.0


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