The java.io.package has many classes that programs can use to read/write data. M

Question

The java.io.package has many classes that programs can use to read/write data. Most of the classes implement sequential access streams which can be divided into two groups: 1. Those that can read/write bytes 2. Those that can read/write Unicode characters Each stream has a specialty, such as read/write from/to a file, filtering data during that process, or serializing an object. The java.nio.file package provides support for file/filesystem I/O, the key points: Path - class with methods for manipulating a path Files - class with methods for moving, copy, deleting operations, and setting/retreiving file attributes FileSystem - class with methods for obtaining info about the file sysytem nio.2 includes features such as multicasting, asynchonous I/O and creating your own file system implementation. Of course it's a deep well...

Explanation / Answer

Please find short discription of classes:

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.

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