OpenJDK 1.22 · java.io

Modifier and Type	Interface and Description
public interface	Closeable A `Closeable` is a source or destination of data that can be closed.
public interface	DataInput The `DataInput` interface provides for reading bytes from a binary stream and reconstructing from them data in any of the Java primitive types.
public interface	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.
public interface	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.
public interface	FileFilter A filter for abstract pathnames.
public interface	FilenameFilter Instances of classes that implement this interface are used to filter filenames.
public interface	Flushable A `Flushable` is a destination of data that can be flushed.
public interface	ObjectInput ObjectInput extends the DataInput interface to include the reading of objects.
public interface	ObjectInputFilter Filter classes, array lengths, and graph metrics during deserialization.
public interface	ObjectInputValidation Callback interface to allow validation of objects within a graph.
public interface	ObjectOutput ObjectOutput extends the DataOutput interface to include writing of objects.
public interface	ObjectStreamConstants Constants written into the Object Serialization Stream.
public interface	Serializable Serializability of a class is enabled by the class implementing the java.io.Serializable interface.

Modifier and Type	Annotation and Description
public @interface	Serial Indicates that an annotated field or method is part of the serialization mechanism defined by the Java Object Serialization Specification.

Class Summary

Modifier and Type	Class and Description
public class	BufferedInputStream A `BufferedInputStream` adds functionality to another input stream-namely, the ability to buffer the input and to support the `mark` and `reset` methods.
public class	BufferedOutputStream The class implements a buffered output stream.
public class	BufferedReader Reads text from a character-input stream, buffering characters so as to provide for the efficient reading of characters, arrays, and lines.
public class	BufferedWriter Writes text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings.
public class	ByteArrayInputStream A `ByteArrayInputStream` contains an internal buffer that contains bytes that may be read from the stream.
public class	ByteArrayOutputStream This class implements an output stream in which the data is written into a byte array.
public class	CharArrayReader This class implements a character buffer that can be used as a character-input stream.
public class	CharArrayWriter This class implements a character buffer that can be used as a Writer.
public class	CharConversionException Base class for character conversion exceptions.
pack-priv abstract class	ClassCache<T>
public class	Console Methods to access the character-based console device, if any, associated with the current Java virtual machine.
public class	DataInputStream A data input stream lets an application read primitive Java data types from an underlying input stream in a machine-independent way.
public class	DataOutputStream A data output stream lets an application write primitive Java data types to an output stream in a portable way.
pack-priv class	DefaultFileSystem
pack-priv class	DeleteOnExitHook This class holds a set of filenames to be deleted on VM exit through a shutdown hook.
public class	EOFException Signals that an end of file or end of stream has been reached unexpectedly during input.
public class	File An abstract representation of file and directory pathnames.
pack-priv class	FileCleanable Cleanable for a FileDescriptor when it becomes phantom reachable.
public class	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.
public class	FileInputStream A `FileInputStream` obtains input bytes from a file in a file system.
public class	FileNotFoundException Signals that an attempt to open the file denoted by a specified pathname has failed.
public class	FileOutputStream A file output stream is an output stream for writing data to a `File` or to a `FileDescriptor`.
public class	FilePermission This class represents access to a file or directory.
pack-priv class	FilePermissionCollection A FilePermissionCollection stores a set of FilePermission permissions.
public class	FileReader Reads text from character files using a default buffer size.
pack-priv abstract class	FileSystem Package-private abstract class for the local filesystem abstraction.
public class	FileWriter Writes text to character files using a default buffer size.
public class	FilterInputStream A `FilterInputStream` wraps some other input stream, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
public class	FilterOutputStream This class is the superclass of all classes that filter output streams.
public abstract class	FilterReader Abstract class for reading filtered character streams.
public abstract class	FilterWriter Abstract class for writing filtered character streams.
public abstract class	InputStream This abstract class is the superclass of all classes representing an input stream of bytes.
public class	InputStreamReader An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified `charset`.
public class	InterruptedIOException Signals that an I/O operation has been interrupted.
public class	InvalidClassException Thrown when the Serialization runtime detects one of the following problems with a Class.
public class	InvalidObjectException Indicates that one or more deserialized objects failed validation tests.
public class	IOError Thrown when a serious I/O error has occurred.
public class	IOException Signals that an I/O exception of some sort has occurred.
public class	LineNumberInputStream Deprecated This class incorrectly assumes that bytes adequately represent characters. This class is an input stream filter that provides the added functionality of keeping track of the current line number.
public class	LineNumberReader A buffered character-input stream that keeps track of line numbers.
public class	NotActiveException Thrown when serialization or deserialization is not active.
public class	NotSerializableException Thrown when an instance is required to have a Serializable interface.
public class	ObjectInputStream An ObjectInputStream deserializes primitive data and objects previously written using an ObjectOutputStream.
public class	ObjectOutputStream An ObjectOutputStream writes primitive data types and graphs of Java objects to an OutputStream.
public class	ObjectStreamClass Serialization's descriptor for classes.
public abstract class	ObjectStreamException Superclass of all exceptions specific to Object Stream classes.
public class	ObjectStreamField A description of a Serializable field from a Serializable class.
public class	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.
public abstract class	OutputStream This abstract class is the superclass of all classes representing an output stream of bytes.
public class	OutputStreamWriter An OutputStreamWriter is a bridge from character streams to byte streams: Characters written to it are encoded into bytes using a specified `charset`.
public class	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.
public class	PipedOutputStream A piped output stream can be connected to a piped input stream to create a communications pipe.
public class	PipedReader Piped character-input streams.
public class	PipedWriter Piped character-output streams.
public class	PrintStream A `PrintStream` adds functionality to another output stream, namely the ability to print representations of various data values conveniently.
public class	PrintWriter Prints formatted representations of objects to a text-output stream.
pack-priv class	ProxyingConsole Console implementation for internal use.
public class	PushbackInputStream A `PushbackInputStream` adds functionality to another input stream, namely the ability to "push back" or "unread" bytes, by storing pushed-back bytes in an internal buffer.
public class	PushbackReader A character-stream reader that allows characters to be pushed back into the stream.
public class	RandomAccessFile Instances of this class support both reading and writing to a random access file.
public abstract class	Reader Abstract class for reading character streams.
public class	SequenceInputStream A `SequenceInputStream` represents the logical concatenation of other input streams.
pack-priv class	SerialCallbackContext Context during upcalls from object stream to class-defined readObject/writeObject methods.
public class	SerializablePermission This class is for Serializable permissions.
public class	StreamCorruptedException Thrown when control information that was read from an object stream violates internal consistency checks.
public class	StreamTokenizer The `StreamTokenizer` class takes an input stream and parses it into "tokens", allowing the tokens to be read one at a time.
public class	StringBufferInputStream Deprecated This class does not properly convert characters into bytes. As of JDK 1.1, the preferred way to create a stream from a string is via the `StringReader` class. This class allows an application to create an input stream in which the bytes read are supplied by the contents of a string.
public class	StringReader A character stream whose source is a string.
public class	StringWriter A character stream that collects its output in a string buffer, which can then be used to construct a string.
public class	SyncFailedException Signals that a sync operation has failed.
public class	UncheckedIOException Wraps an `IOException` with an unchecked exception.
pack-priv class	UnixFileSystem
public class	UnsupportedEncodingException The Character Encoding is not supported.
public class	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.
public class	WriteAbortedException Signals that one of the ObjectStreamExceptions was thrown during a write operation.
public abstract class	Writer Abstract class for writing to character streams.

Package java.io

Object Serialization

Interface Summary

Annotation Summary

Class Summary