IT. Expert System.

All Known Subinterfaces:

ObjectInput

All Known Implementing Classes:

DataInputStream, ObjectInputStream, ObjectInputStreamTest.ObjectInputStreamWithResolve, ObjectInputStreamTest.ObjectIutputStreamWithReadDesc, ObjectInputStreamTest.ObjectIutputStreamWithReadDesc1, ObjectInputStreamTest.ObjectIutputStreamWithReadDesc2, RandomAccessFile

public interface DataInput

See Also:

DataInputStream, RandomAccessFile

• Method Summary

  Methods

  Modifier and Type	Method and Description
  boolean	readBoolean() Reads a boolean.
  byte	readByte() Reads an 8-bit byte value.
  char	readChar() Reads a big-endian 16-bit character value.
  double	readDouble() Reads a big-endian 64-bit double value.
  float	readFloat() Reads a big-endian 32-bit float value.
  void	readFully(byte[] dst) Equivalent to readFully(dst, 0, dst.length);.
  void	readFully(byte[] dst, int offset, int byteCount) Reads byteCount bytes from this stream and stores them in the byte array dst starting at offset.
  int	readInt() Reads a big-endian 32-bit integer value.
  String	readLine() Returns a string containing the next line of text available from this stream.
  long	readLong() Reads a big-endian 64-bit long value.
  short	readShort() Reads a big-endian 16-bit short value.
  int	readUnsignedByte() Reads an unsigned 8-bit byte value and returns it as an int.
  int	readUnsignedShort() Reads a big-endian 16-bit unsigned short value and returns it as an int.
  String	readUTF() Reads a string encoded with modified UTF-8.
  int	skipBytes(int count) Skips count number of bytes.

• Method Detail

  • readBoolean

    boolean readBoolean()
                        throws IOException

    Reads a boolean.

    Returns:

    the next boolean value.

    Throws:

    EOFException - if the end of the input is reached before the read request can be satisfied.

    IOException - if an I/O error occurs while reading.

    See Also:

    DataOutput.writeBoolean(boolean)

  • readByte

    byte readByte()
                  throws IOException

    Reads an 8-bit byte value.

    Returns:

    the next byte value.

    Throws:

    EOFException - if the end of the input is reached before the read request can be satisfied.

    IOException - if an I/O error occurs while reading.

    See Also:

    DataOutput.writeByte(int)

  • readChar

    char readChar()
                  throws IOException

    Reads a big-endian 16-bit character value.

    Returns:

    the next char value.

    Throws:

    EOFException - if the end of the input is reached before the read request can be satisfied.

    IOException - if an I/O error occurs while reading.

    See Also:

    DataOutput.writeChar(int)

  • readDouble

    double readDouble()
                      throws IOException

    Reads a big-endian 64-bit double value.

    Returns:

    the next double value.

    Throws:

    EOFException - if the end of the input is reached before the read request can be satisfied.

    IOException - if an I/O error occurs while reading.

    See Also:

    DataOutput.writeDouble(double)

  • readFloat

    float readFloat()
                    throws IOException

    Reads a big-endian 32-bit float value.

    Returns:

    the next float value.

    Throws:

    EOFException - if the end of the input is reached before the read request can be satisfied.

    IOException - if an I/O error occurs while reading.

    See Also:

    DataOutput.writeFloat(float)

  • readFully

    void readFully(byte[] dst)
                   throws IOException

    Equivalent to readFully(dst, 0, dst.length);.

    Throws:

    IOException

  • readFully

    void readFully(byte[] dst,
                 int offset,
                 int byteCount)
                   throws IOException

    Reads byteCount bytes from this stream and stores them in the byte array dst starting at offset. If byteCount is zero, then this method returns without reading any bytes. Otherwise, this method blocks until byteCount bytes have been read. If insufficient bytes are available, EOFException is thrown. If an I/O error occurs, IOException is thrown. When an exception is thrown, some bytes may have been consumed from the stream and written into the array.

    Parameters:

    dst - the byte array into which the data is read.

    offset - the offset in dst at which to store the bytes.

    byteCount - the number of bytes to read.

    Throws:

    EOFException - if the end of the source stream is reached before enough bytes have been read.

    IndexOutOfBoundsException - if offset < 0 or byteCount < 0, or offset + byteCount > dst.length.

    IOException - if a problem occurs while reading from this stream.

    NullPointerException - if dst is null.

  • readInt

    int readInt()
                throws IOException

    Reads a big-endian 32-bit integer value.

    Returns:

    the next int value.

    Throws:

    EOFException - if the end of the input is reached before the read request can be satisfied.

    IOException - if an I/O error occurs while reading.

    See Also:

    DataOutput.writeInt(int)

  • readLine

    String readLine()
                    throws IOException

    Returns a string containing the next line of text available from this stream. A line is made of zero or more characters followed by '\n', '\r', "\r\n" or the end of the stream. The string does not include the newline sequence.

    Returns:

    the contents of the line or null if no characters have been read before the end of the stream.

    Throws:

    EOFException - if the end of the input is reached before the read request can be satisfied.

    IOException - if an I/O error occurs while reading.

  • readLong

    long readLong()
                  throws IOException

    Reads a big-endian 64-bit long value.

    Returns:

    the next long value.

    Throws:

    EOFException - if the end of the input is reached before the read request can be satisfied.

    IOException - if an I/O error occurs while reading.

    See Also:

    DataOutput.writeLong(long)

  • readShort

    short readShort()
                    throws IOException

    Reads a big-endian 16-bit short value.

    Returns:

    the next short value.

    Throws:

    EOFException - if the end of the input is reached before the read request can be satisfied.

    IOException - if an I/O error occurs while reading.

    See Also:

    DataOutput.writeShort(int)

  • readUnsignedByte

    int readUnsignedByte()
                         throws IOException

    Reads an unsigned 8-bit byte value and returns it as an int.

    Returns:

    the next unsigned byte value.

    Throws:

    EOFException - if the end of the input is reached before the read request can be satisfied.

    IOException - if an I/O error occurs while reading.

    See Also:

    DataOutput.writeByte(int)

  • readUnsignedShort

    int readUnsignedShort()
                          throws IOException

    Reads a big-endian 16-bit unsigned short value and returns it as an int.

    Returns:

    the next unsigned short value.

    Throws:

    EOFException - if the end of the input is reached before the read request can be satisfied.

    IOException - if an I/O error occurs while reading.

    See Also:

    DataOutput.writeShort(int)

  • readUTF

    String readUTF()
                   throws IOException

    Reads a string encoded with modified UTF-8.

    Returns:

    the next string encoded with modified UTF-8.

    Throws:

    EOFException - if the end of the input is reached before the read request can be satisfied.

    IOException - if an I/O error occurs while reading.

    See Also:

    DataOutput.writeUTF(java.lang.String)

  • skipBytes

    int skipBytes(int count)
                  throws IOException

    Skips count number of bytes. This method will not throw an EOFException if the end of the input is reached before count bytes where skipped.

    Parameters:

    count - the number of bytes to skip.

    Returns:

    the number of bytes actually skipped.

    Throws:

    IOException - if a problem occurs during skipping.