IT. Expert System.

All Implemented Interfaces:

Closeable, DataInput, AutoCloseable

public class DataInputStream
extends FilterInputStream
implements DataInput

See Also:

DataOutputStream

• Field Summary

  • Fields inherited from class java.io.FilterInputStream

    in

• Constructor Summary

  Constructors

  Constructor and Description
  DataInputStream(InputStream in) Constructs a new DataInputStream on the InputStream in.

• Method Summary

  Methods

  Modifier and Type	Method and Description
  int	read(byte[] buffer) Equivalent to read(buffer, 0, buffer.length).
  int	read(byte[] buffer, int offset, int length) Reads at most length bytes from this stream and stores them in the byte array buffer starting at offset.
  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() Deprecated.
  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.
  static String	readUTF(DataInput in)
  int	skipBytes(int count) Skips count number of bytes in this stream.

  • Methods inherited from class java.io.FilterInputStream

    available, close, mark, markSupported, read, reset, skip

  • Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Constructor Detail

  • DataInputStream

    public DataInputStream(InputStream in)

    Constructs a new DataInputStream on the InputStream in. All reads are then filtered through this stream. Note that data read by this stream is not in a human readable format and was most likely created by a DataOutputStream.

    Warning: passing a null source creates an invalid DataInputStream. All operations on such a stream will fail.

    Parameters:

    in - the source InputStream the filter reads from.

    See Also:

    DataOutputStream, RandomAccessFile

• Method Detail

  • read

    public final int read(byte[] buffer)
                   throws IOException

    Description copied from class: InputStream
    Equivalent to read(buffer, 0, buffer.length).

    Overrides:

    read in class InputStream

    Throws:

    IOException

  • read

    public final int read(byte[] buffer,
           int offset,
           int length)
                   throws IOException

    Reads at most length bytes from this stream and stores them in the byte array buffer starting at offset. Returns the number of bytes that have been read or -1 if no bytes have been read and the end of the stream has been reached.

    Overrides:

    read in class FilterInputStream

    Parameters:

    buffer - the byte array in which to store the bytes read.

    offset - the initial position in buffer to store the bytes read from this stream.

    length - the maximum number of bytes to store in buffer.

    Returns:

    the number of bytes that have been read or -1 if the end of the stream has been reached.

    Throws:

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

    See Also:

    DataOutput.write(byte[]), DataOutput.write(byte[], int, int)

  • readBoolean

    public final boolean readBoolean()
                              throws IOException

    Description copied from interface: DataInput
    Reads a boolean.

    Specified by:

    readBoolean in interface DataInput

    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

    public final byte readByte()
                        throws IOException

    Description copied from interface: DataInput
    Reads an 8-bit byte value.

    Specified by:

    readByte in interface DataInput

    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

    public final char readChar()
                        throws IOException

    Description copied from interface: DataInput
    Reads a big-endian 16-bit character value.

    Specified by:

    readChar in interface DataInput

    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

    public final double readDouble()
                            throws IOException

    Description copied from interface: DataInput
    Reads a big-endian 64-bit double value.

    Specified by:

    readDouble in interface DataInput

    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

    public final float readFloat()
                          throws IOException

    Description copied from interface: DataInput
    Reads a big-endian 32-bit float value.

    Specified by:

    readFloat in interface DataInput

    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

    public final void readFully(byte[] dst)
                         throws IOException

    Description copied from interface: DataInput
    Equivalent to readFully(dst, 0, dst.length);.

    Specified by:

    readFully in interface DataInput

    Throws:

    IOException

  • readFully

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

    Description copied from interface: DataInput
    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.

    Specified by:

    readFully in interface DataInput

    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.

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

  • readInt

    public final int readInt()
                      throws IOException

    Description copied from interface: DataInput
    Reads a big-endian 32-bit integer value.

    Specified by:

    readInt in interface DataInput

    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

    @Deprecated
    public final String readLine()
                          throws IOException

    Deprecated.
    Description copied from interface: DataInput
    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.

    Specified by:

    readLine in interface DataInput

    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

    public final long readLong()
                        throws IOException

    Description copied from interface: DataInput
    Reads a big-endian 64-bit long value.

    Specified by:

    readLong in interface DataInput

    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

    public final short readShort()
                          throws IOException

    Description copied from interface: DataInput
    Reads a big-endian 16-bit short value.

    Specified by:

    readShort in interface DataInput

    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

    public final int readUnsignedByte()
                               throws IOException

    Description copied from interface: DataInput
    Reads an unsigned 8-bit byte value and returns it as an int.

    Specified by:

    readUnsignedByte in interface DataInput

    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

    public final int readUnsignedShort()
                                throws IOException

    Description copied from interface: DataInput
    Reads a big-endian 16-bit unsigned short value and returns it as an int.

    Specified by:

    readUnsignedShort in interface DataInput

    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

    public final String readUTF()
                         throws IOException

    Description copied from interface: DataInput
    Reads a string encoded with modified UTF-8.

    Specified by:

    readUTF in interface DataInput

    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)

  • readUTF

    public static final String readUTF(DataInput in)
                                throws IOException

    Throws:

    IOException

  • skipBytes

    public final int skipBytes(int count)
                        throws IOException

    Skips count number of bytes in this stream. Subsequent read()s will not return these bytes unless reset() is used. This method will not throw an EOFException if the end of the input is reached before count bytes where skipped.

    Specified by:

    skipBytes in interface DataInput

    Parameters:

    count - the number of bytes to skip.

    Returns:

    the number of bytes actually skipped.

    Throws:

    IOException - if a problem occurs during skipping.

    See Also:

    FilterInputStream.mark(int), FilterInputStream.reset()