Classes and Interfaces of Java I/O Streams

 

The java.io package contains a number of classes, interfaces and exceptions. They will be needed in program development related to Java I/O and File  operations. Their descriptions are given below.

 

Java I/O Classes

The following listings of classes of java.io package shown in the table:

Class	Description
BufferedInputStream	It used for creating an internal buffer array. It supports the mark and reset methods.
BufferedOutputStream	This class used for writes byte to output stream. It implements a buffered output stream.
BufferedReader	This class provides read text from character input stream and buffering characters. It also reads characters, arrays and lines.
BufferedWriter	This class provides write text from character output stream and buffering characters. It also writes characters, arrays and lines.
ByteArrayInputStream	It contains the internal buffer and reads data from the stream.
ByteArrayOutputStream	This class used for data is written into byte array. This is implemented in output stream class.
CharArrayReader	It used for char input stream and implements a character buffer.
CharArrayWriter	This class also implements a character buffer and it uses a writer.
DataInputStream	This class reads the primitive data types from the input stream in a machine format.
DataOutputStream	This class writes the primitive data types from the output stream in machine format.
File	This class shows a file and directory pathnames.
FileDescriptor	This class uses for create a FileInputStream and FileOutputStream.
FileInputStream	It contains the input byte from a file and implements an input stream.
FileOutputStream	It uses for writing data to a file and also implements an output stream.
FilePermission	It provides the permission to access a file or directory.
FileReader	This class used for reading characters file.
FileWriter	This class used for writing characters files.
FilterInputStream	This class overrides all methods of InputStream and contains some other input stream.
FilterOutputStream	This class overrides all methods of OutputStream and contains some other output stream.
FilterReader	It reads the data from the filtered character stream.
FilterWriter	It writes data from the filtered character stream.
InputStream	This class represents an input stream of bytes.
InputStreamReader	It reads bytes and decodes them into characters.
LineNumberReader	This class has a line numbers
ObjectInputStream	This class used for recover the object to serialize previously.
ObjectInputStream.GetField	This class access to president fields read form input stream.
ObjectOutputStream	This class is used for write the primitive data types and also write the object to read by the ObjectInputStream.
ObjectOutputStream.GetField	This class access to president fields write in to ObjectOutput.
ObjectStreamClass	Serialization’s descriptor for classes.
ObjectStreamField	This class describes the serializable field.
OutputStream	This class represents an output stream of bytes.
OutputStreamWriter	It writes bytes and decodes them into characters.
PipedInputStream	In this class the data bytes are written into piped output stream. This class also connected into a piped output stream.
PipedOutputStream	This class also communicates the piped input stream into piped output stream. It creates communication between both.
PipedReader	It is a piped character-input stream.
PipedWriter	It is a piped character-output stream.
PrintStream	This class adds the functionality of another output stream.
PrintWriter	This class adds the functionality of another input stream.
PushbackInputStream	It also include the another function of input stream. Such as: “push back” or “unread” one byte.
PushbackReader	This is a character stream reader and reads the data push back into the stream.
RandomAccessFile	It supports both reading and writing to a random access file.
Reader	It is used for reading character stream.
SequenceInputStream	It represents the logical concatenation of other input stream.
SerializablePermission	This is a serializable permission class.
StreamTokenizer	It takes an input stream and parses it into “tokens”. The token to be allowed at the read time.
StringReader	This is a character string class. It has character read source.
StringWriter	This is also a character string class. It uses to shows the output in the buffer.
Writer	It is used for writing to character stream.

 

Interfaces

The Interfaces provided by the java.io package shown in the table below:

Interface	Description
DataInput	This interface can be used for reading byte stream and reconstructing the java primitive data types.
DataOutput	This interface can be used for writing the byte stream and converting data from the java primitive data types.
Externalizable	This is written in Serializable Stream. It saves and stores its contents.
FileFilter	It can be used for Filtering the Pathnames.
FilenameFilter	This interface used for Filter the Filenames.
ObjectInput	This interface used for reading of objects and it extends the DataInput interface.
ObjectInputValidation	This is a Callback interface. It allows the validation of objects within a graph.
ObjectOutput	This interface used for writing of objects and it extends the DataOutput interface.
ObjectStreamConstants	This interface used for Constants writing into Serialization Objects Stream.
Serializable	This interface implementing in the java.io.Serializable interface.

 

Exceptions Classes:

The exception classes of the java.io package shown in the table below:

Exceptions	Description
CharConversionException	It provides detail message in the catch block to associated with the CharConversionException
EOFException	This exception indicates the end of file. When the file input stream to be end then EOFException to be occuted.
FileNotFoundException	When the open file’s pathname does not find then this exception to be occured.
InterruptedIOException	When the I/O operations to interrupt from any causes then it becomes.
InvalidClassException	Any problems to be created with class, when the Serializing runtime to be detected.
InvalidObjectException	When the de-serialized objects failed then it occurs.
IOException	When the I/O operations to be failed then it occurs.
NotActiveException	The Serialization or deserialization operations are not active then it occurs.
NotSerializableException	This exception when the instance is required to a Serializable interface.
ObjectStreamException	This is a supper class of all exception class. It is used for specific to Object Stream Classes.
OptionalDataException	When the reading data operations to fail then it these exception occurs. It is belonging to the serialized object
StreamCorruptedException	It thrown when the control information that was read form an object stream violates internal consistency checks.
SyncFaieldException	The sync operation is failed then SyncFaieldException to be occurred.
UnsupportedEncodingException	The Character Encoding is not supported.
UTFDataFormatException	A malformed UTF-8 has been read in a data input stream, it implemented by data input interface.
WriteAbortedException	In this exception to be thrown by the ObjectStreamException during a write operating.