java.io (GNU libgcj 4.4.3 Documentation)

Package java.io

Interface Summary
Closeable	A `Closeable` class represents a stream of data, which can be closed when it is no longer needed.
DataInput	This interface is implemented by classes that can data from streams into Java primitive types.
DataOutput	This interface is implemented by classes that can wrte data to streams from Java primitive types.
Externalizable	This interface provides a way that classes can completely control how the data of their object instances are written and read to and from streams.
FileFilter	This interface has one method which is used for filtering pathnames returned in a pathname listing.
FilenameFilter	This interface has one method which is used for filtering filenames returned in a directory listing.
Flushable	A `Flushable` class represents a stream of data, for which internally buffered data can be `flushed'.
ObjectInput	This interface extends the `DataInput` interface to provide a facility to read objects as well as primitive types from a stream.
ObjectInputValidation	This class allows an object to validate that it is valid after deserialization has run completely for it and all dependent objects.
ObjectOutput	This interface extends `DataOutput` to provide the additional facility of writing object instances to a stream.
ObjectStreamConstants	This interface contains constants that are used in object serialization.
Serializable	This interface has no methods.

Interface Summary

Closeable

A Closeable class represents a stream of data, which can be closed when it is no longer needed.

DataInput

This interface is implemented by classes that can data from streams into Java primitive types.

DataOutput

This interface is implemented by classes that can wrte data to streams from Java primitive types.

Externalizable

This interface provides a way that classes can completely control how the data of their object instances are written and read to and from streams.

FileFilter

This interface has one method which is used for filtering pathnames returned in a pathname listing.

FilenameFilter

This interface has one method which is used for filtering filenames returned in a directory listing.

Flushable

A Flushable class represents a stream of data, for which internally buffered data can be `flushed'.

ObjectInput

This interface extends the DataInput interface to provide a facility to read objects as well as primitive types from a stream.

ObjectInputValidation

This class allows an object to validate that it is valid after deserialization has run completely for it and all dependent objects.

ObjectOutput

This interface extends DataOutput to provide the additional facility of writing object instances to a stream.

ObjectStreamConstants

This interface contains constants that are used in object serialization.

Serializable

This interface has no methods.

Class Summary
BufferedInputStream	This subclass of `FilterInputStream` buffers input from an underlying implementation to provide a possibly more efficient read mechanism.
BufferedOutputStream	This class accumulates bytes written in a buffer instead of immediately writing the data to the underlying output sink.
BufferedReader	This subclass of `FilterReader` buffers input from an underlying implementation to provide a possibly more efficient read mechanism.
BufferedWriter	This class accumulates chars written in a buffer instead of immediately writing the data to the underlying output sink.
ByteArrayInputStream	This class permits an array of bytes to be read as an input stream.
ByteArrayOutputStream	This class allows data to be written to a byte array buffer and and then retrieved by an application.
CharArrayReader	This class permits an array of chars to be read as an input stream.
CharArrayWriter	This class allows data to be written to a char array buffer and and then retrieved by an application.
CharConversionException	This exception is thrown to indicate that a problem occurred with an attempted character conversion.
DataInputStream	This subclass of `FilteredInputStream` implements the `DataInput` interface that provides method for reading primitive Java data types from a stream.
DataOutputStream	This class provides a mechanism for writing primitive Java datatypes to an `OutputStream` in a portable way.
EOFException	This exception is thrown when the end of the file or stream was encountered unexpectedly.
File	This class represents a file or directory on a local disk.
FileDescriptor	This class represents an opaque file handle as a Java class.
FileInputStream	This class is a stream that reads its bytes from a file.
FileNotFoundException	This exception is thrown when an attempt is made to access a file that does not exist, or is inaccessible for some other reason (such as writing a read-only file).
FileOutputStream	This classes allows a stream of data to be written to a disk file or any open `FileDescriptor`.
FilePermission
FileReader	This class provides a convenient way to set up a `Reader` to read from a file.
FileWriter	This is a convenience class for writing to files.
FilterInputStream	This is the common superclass of all standard classes that filter input.
FilterOutputStream	This class is the common superclass of output stream classes that filter the output they write.
FilterReader	This is the common superclass of all standard classes that filter input.
FilterWriter	This class is the common superclass of output character stream classes that filter the output they write.
InputStream	This abstract class forms the base of the hierarchy of classes that read input as a stream of bytes.
InputStreamReader	This class reads characters from a byte input stream.
InterruptedIOException	This exception is thrown when a in process I/O operation is interrupted for some reason.
InvalidClassException	This exception is thrown when there is some sort of problem with a class during a serialization operation.
InvalidObjectException	This exception is thrown when an object fails a validation test during serialization.
IOException	This exception is thrown to indicate an I/O problem of some sort occurred.
LineNumberInputStream	This class functions like a standard `InputStream` except that it counts line numbers, and canonicalizes newline characters.
LineNumberReader	This class functions like a standard `Reader` except that it counts line numbers, and canonicalizes newline characters.
NotActiveException	This exception is thrown when a problem occurs due to the fact that serialization is not active.
NotSerializableException	This exception is thrown when a class implements Serializable because of a superclass, but should not be serialized.
ObjectInputStream
ObjectInputStream.GetField	This class allows a class to specify exactly which fields should be read, and what values should be read for these fields.
ObjectOutputStream	An `ObjectOutputStream` can be used to write objects as well as primitive data in a platform-independent manner to an `OutputStream`.
ObjectOutputStream.PutField	This class allows a class to specify exactly which fields should be written, and what values should be written for these fields.
ObjectStreamClass
ObjectStreamException	This exception is thrown when a problem occurs during serialization.
ObjectStreamField	This class intends to describe the field of a class for the serialization subsystem.
OptionalDataException	This exception is thrown when unexpected data appears in the input stream from which a serialized object is being read.
OutputStream	This abstract class forms the base of the hierarchy of classes that write output as a stream of bytes.
OutputStreamWriter	This class writes characters to an output stream that is byte oriented It converts the chars that are written to bytes using an encoding layer, which is specific to a particular encoding standard.
PipedInputStream	An input stream that reads its bytes from an output stream to which it is connected.
PipedOutputStream	This class writes its bytes to a `PipedInputStream` to which it is connected.
PipedReader	An input stream that reads characters from a piped writer to which it is connected.
PipedWriter	This class writes its chars to a `PipedReader` to which it is connected.
PrintStream	This class prints Java primitive values and object to a stream as text.
PrintWriter	This class prints Java primitive values and objects to a stream as text.
PushbackInputStream	This subclass of `FilterInputStream` provides the ability to unread data from a stream.
PushbackReader	This subclass of `FilterReader` provides the ability to unread data from a stream.
RandomAccessFile	This class allows reading and writing of files at random locations.
Reader	This abstract class forms the base of the hierarchy of classes that read input as a stream of characters.
SequenceInputStream	This class merges a sequence of multiple `InputStream`'s in order to form a single logical stream that can be read by applications that expect only one stream.
SerializablePermission	This class models permissions related to serialization.
StreamCorruptedException	This exception is thrown when there is an error in the data that is read from a stream during de-serialization.
StreamTokenizer	This class parses streams of characters into tokens.
StringBufferInputStream	This class permits a `String` to be read as an input stream.
StringReader	This class permits a `String` to be read as a character input stream.
StringWriter	This class writes chars to an internal `StringBuffer` that can then be used to retrieve a `String`.
SyncFailedException	Thrown when a file synchronization fails.
UnsupportedEncodingException	This exception is thrown when the requested character encoding is not supported.
UTFDataFormatException	When reading a UTF string from an input stream, this exception is thrown to indicate that the data read is invalid.
WriteAbortedException	This exception is thrown when another ObjectStreamException occurs during a serialization read or write.
Writer	This abstract class forms the base of the hierarchy of classes that write output as a stream of chars.

Class Summary

BufferedInputStream

This subclass of FilterInputStream buffers input from an underlying implementation to provide a possibly more efficient read mechanism.

BufferedOutputStream

This class accumulates bytes written in a buffer instead of immediately writing the data to the underlying output sink.

BufferedReader

This subclass of FilterReader buffers input from an underlying implementation to provide a possibly more efficient read mechanism.

BufferedWriter

This class accumulates chars written in a buffer instead of immediately writing the data to the underlying output sink.

ByteArrayInputStream

This class permits an array of bytes to be read as an input stream.

ByteArrayOutputStream

This class allows data to be written to a byte array buffer and and then retrieved by an application.

CharArrayReader

This class permits an array of chars to be read as an input stream.

CharArrayWriter

This class allows data to be written to a char array buffer and and then retrieved by an application.

CharConversionException

This exception is thrown to indicate that a problem occurred with an attempted character conversion.

DataInputStream

This subclass of FilteredInputStream implements the DataInput interface that provides method for reading primitive Java data types from a stream.

DataOutputStream

This class provides a mechanism for writing primitive Java datatypes to an OutputStream in a portable way.

EOFException

This exception is thrown when the end of the file or stream was encountered unexpectedly.

File

This class represents a file or directory on a local disk.

FileDescriptor

This class represents an opaque file handle as a Java class.

FileInputStream

This class is a stream that reads its bytes from a file.

FileNotFoundException

This exception is thrown when an attempt is made to access a file that does not exist, or is inaccessible for some other reason (such as writing a read-only file).

FileOutputStream

This classes allows a stream of data to be written to a disk file or any open FileDescriptor.

FilePermission

FileReader

This class provides a convenient way to set up a Reader to read from a file.

FileWriter

This is a convenience class for writing to files.

FilterInputStream

This is the common superclass of all standard classes that filter input.

FilterOutputStream

This class is the common superclass of output stream classes that filter the output they write.

FilterReader

This is the common superclass of all standard classes that filter input.

FilterWriter

This class is the common superclass of output character stream classes that filter the output they write.

InputStream

This abstract class forms the base of the hierarchy of classes that read input as a stream of bytes.

InputStreamReader

This class reads characters from a byte input stream.

InterruptedIOException

This exception is thrown when a in process I/O operation is interrupted for some reason.

InvalidClassException

This exception is thrown when there is some sort of problem with a class during a serialization operation.

InvalidObjectException

This exception is thrown when an object fails a validation test during serialization.

IOException

This exception is thrown to indicate an I/O problem of some sort occurred.

LineNumberInputStream

This class functions like a standard InputStream except that it counts line numbers, and canonicalizes newline characters.

LineNumberReader

This class functions like a standard Reader except that it counts line numbers, and canonicalizes newline characters.

NotActiveException

This exception is thrown when a problem occurs due to the fact that serialization is not active.

NotSerializableException

This exception is thrown when a class implements Serializable because of a superclass, but should not be serialized.

ObjectInputStream

ObjectInputStream.GetField

This class allows a class to specify exactly which fields should be read, and what values should be read for these fields.

ObjectOutputStream

An ObjectOutputStream can be used to write objects as well as primitive data in a platform-independent manner to an OutputStream.

ObjectOutputStream.PutField

This class allows a class to specify exactly which fields should be written, and what values should be written for these fields.

ObjectStreamClass

ObjectStreamException

This exception is thrown when a problem occurs during serialization.

ObjectStreamField

This class intends to describe the field of a class for the serialization subsystem.

OptionalDataException

This exception is thrown when unexpected data appears in the input stream from which a serialized object is being read.

OutputStream

This abstract class forms the base of the hierarchy of classes that write output as a stream of bytes.

OutputStreamWriter

This class writes characters to an output stream that is byte oriented It converts the chars that are written to bytes using an encoding layer, which is specific to a particular encoding standard.

PipedInputStream

An input stream that reads its bytes from an output stream to which it is connected.

PipedOutputStream

This class writes its bytes to a PipedInputStream to which it is connected.

PipedReader

An input stream that reads characters from a piped writer to which it is connected.

PipedWriter

This class writes its chars to a PipedReader to which it is connected.

PrintStream

This class prints Java primitive values and object to a stream as text.

PrintWriter

This class prints Java primitive values and objects to a stream as text.

PushbackInputStream

This subclass of FilterInputStream provides the ability to unread data from a stream.

PushbackReader

This subclass of FilterReader provides the ability to unread data from a stream.

RandomAccessFile

This class allows reading and writing of files at random locations.

Reader

This abstract class forms the base of the hierarchy of classes that read input as a stream of characters.

SequenceInputStream

This class merges a sequence of multiple InputStream's in order to form a single logical stream that can be read by applications that expect only one stream.

SerializablePermission

This class models permissions related to serialization.

StreamCorruptedException

This exception is thrown when there is an error in the data that is read from a stream during de-serialization.

StreamTokenizer

This class parses streams of characters into tokens.

StringBufferInputStream

This class permits a String to be read as an input stream.

StringReader

This class permits a String to be read as a character input stream.

StringWriter

This class writes chars to an internal StringBuffer that can then be used to retrieve a String.

SyncFailedException

Thrown when a file synchronization fails.

UnsupportedEncodingException

This exception is thrown when the requested character encoding is not supported.

UTFDataFormatException

When reading a UTF string from an input stream, this exception is thrown to indicate that the data read is invalid.

WriteAbortedException

This exception is thrown when another ObjectStreamException occurs during a serialization read or write.

Writer

This abstract class forms the base of the hierarchy of classes that write output as a stream of chars.