java.io

Interfaces

Closeable	Defines an interface for classes that can (or need to) be closed once they are not used any longer.
DataInput	Defines an interface for classes that are able to read big-endian typed data from some source.
DataOutput	Defines an interface for classes that are able to write big-endian typed data to some target.
Externalizable	Defines an interface for classes that want to be serializable, but have their own binary representation.
FileFilter	An interface for filtering `File` objects based on their names or other information.
FilenameFilter	An interface for filtering `File` objects based on their names or the directory they reside in.
Flushable	Defines an interface for classes that can (or need to) be flushed, typically before some output processing is considered to be finished and the object gets closed.
ObjectInput	Defines an interface for classes that allow reading serialized objects.
ObjectInputValidation	A callback interface for post-deserialization checks on objects.
ObjectOutput	Defines an interface for classes that allow reading serialized objects.
ObjectStreamConstants	A helper interface with constants used by the serialization implementation.
Serializable	An empty marker interface for classes that want to support serialization and deserialization based on the `ObjectOutputStream` and `ObjectInputStream` classes.

Classes

BufferedInputStream	Wraps an existing `InputStream` and buffers the input.
BufferedOutputStream	Wraps an existing `OutputStream` and buffers the output.
BufferedReader	Wraps an existing `Reader` and buffers the input.
BufferedWriter	Wraps an existing `Writer` and buffers the output.
ByteArrayInputStream	A specialized `InputStream` for reading the contents of a byte array.
ByteArrayOutputStream	A specialized `OutputStream` for class for writing content to an (internal) byte array.
CharArrayReader	A specialized `Reader` for reading the contents of a char array.
CharArrayWriter	A specialized `Writer` for class for writing content to an (internal) char array.
Console	Provides access to the console, if available.
DataInputStream	Wraps an existing `InputStream` and reads big-endian typed data from it.
DataOutputStream	Wraps an existing `OutputStream` and writes big-endian typed data to it.
File	An "abstract" representation of a file system entity identified by a pathname.
FileDescriptor	The lowest-level representation of a file, device, or socket.
FileInputStream	An input stream that reads bytes from a file.
FileOutputStream	An output stream that writes bytes to a file.
FilePermission	A permission for accessing a file or directory.
FileReader	A specialized `Reader` that reads from a file in the file system.
FileWriter	A specialized `Writer` that writes to a file in the file system.
FilterInputStream	Wraps an existing `InputStream` and performs some transformation on the input data while it is being read.
FilterOutputStream	Wraps an existing `OutputStream` and performs some transformation on the output data while it is being written.
FilterReader	Wraps an existing `Reader` and performs some transformation on the input data while it is being read.
FilterWriter	Wraps an existing `Writer` and performs some transformation on the output data while it is being written.
InputStream	The base class for all input streams.
InputStreamReader	A class for turning a byte stream into a character stream.
LineNumberInputStream	This class is deprecated. Use `LineNumberReader`
LineNumberReader	Wraps an existing `Reader` and counts the line terminators encountered while reading the data.
ObjectInputStream	A specialized `InputStream` that is able to read (deserialize) Java objects as well as primitive data types (int, byte, char etc.).
ObjectInputStream.GetField	GetField is an inner class that provides access to the persistent fields read from the source stream.
ObjectOutputStream	A specialized `OutputStream` that is able to write (serialize) Java objects as well as primitive data types (int, byte, char etc.).
ObjectOutputStream.PutField	PutField is an inner class to provide access to the persistent fields that are written to the target stream.
ObjectStreamClass	Represents a descriptor for identifying a class during serialization and deserialization.
ObjectStreamField	Describes a field for the purpose of serialization.
OutputStream	The base class for all output streams.
OutputStreamWriter	A class for turning a character stream into a byte stream.
PipedInputStream	Receives information from a communications pipe.
PipedOutputStream	Places information on a communications pipe.
PipedReader	Receives information on a communications pipe.
PipedWriter	Places information on a communications pipe.
PrintStream	Wraps an existing `OutputStream` and provides convenience methods for writing common data types in a human readable format.
PrintWriter	Wraps either an existing `OutputStream` or an existing `Writer` and provides convenience methods for printing common data types in a human readable format.
PushbackInputStream	Wraps an existing `InputStream` and adds functionality to "push back" bytes that have been read, so that they can be read again.
PushbackReader	Wraps an existing `Reader` and adds functionality to "push back" characters that have been read, so that they can be read again.
RandomAccessFile	Allows reading from and writing to a file in a random-access manner.
Reader	The base class for all readers.
SequenceInputStream	Concatenates two or more existing `InputStream`s.
SerializablePermission	Is used to enable access to potentially unsafe serialization operations.
StreamTokenizer	Parses a stream into a set of defined tokens, one at a time.
StringBufferInputStream	This class is deprecated. Use `StringReader`
StringReader	A specialized `Reader` that reads characters from a `String` in a sequential manner.
StringWriter	A specialized `Writer` that writes characters to a `StringBuffer` in a sequential manner, appending them in the process.
Writer	The base class for all writers.

Exceptions

CharConversionException	The top level class for character conversion exceptions.
EOFException	Thrown when a program encounters the end of a file or stream during an input operation.
FileNotFoundException	Thrown when a file specified by a program cannot be found.
InterruptedIOException	Signals that a blocking I/O operation has been interrupted.
InvalidClassException	Signals a problem during the serialization or or deserialization of an object.
InvalidObjectException	Signals that, during deserialization, the validation of an object has failed.
IOException	Signals a general, I/O-related error.
NotActiveException	Signals that a serialization-related method has been invoked in the wrong place.
NotSerializableException	Signals that an object that is not serializable has been passed into the `ObjectOutput.writeObject()` method.
ObjectStreamException	Signals some sort of problem during either serialization or deserialization of objects.
OptionalDataException	Signals that the `ObjectInputStream` class encountered a primitive type (`int`, `char` etc.) instead of an object instance in the input stream.
StreamCorruptedException	Signals that the `readObject()` method could not read an object due to missing information (for example, a cyclic reference that doesn't match a previous instance, or a missing class descriptor for the object to be loaded).
SyncFailedException	Signals that the `sync()` method has failed to complete.
UnsupportedEncodingException	Thrown when a program asks for a particular character converter that is unavailable.
UTFDataFormatException	Signals that an incorrectly encoded UTF-8 string has been encountered, most likely while reading some `DataInputStream`.
WriteAbortedException	Signals that the `readObject()` method has detected an exception marker in the input stream.

Errors

IOError This error is thrown when a severe I/O error has happened.