Java compact1, compact2, compact3 java.io Class CharArrayReader（JDK8）

Field Detail

• buf

  protected char[] buf

  The character buffer.

• pos

  protected int pos

  The current buffer position.

• markedPos

  protected int markedPos

  The position of mark in buffer.

• count

  protected int count

  The index of the end of this buffer. There is not valid data at or beyond this index.

Constructor Detail

• CharArrayReader

  public CharArrayReader(char[] buf)

  Creates a CharArrayReader from the specified array of chars.

  Parameters:

  buf - Input buffer (not copied)

• CharArrayReader

  public CharArrayReader(char[] buf,
                         int offset,
                         int length)

  Creates a CharArrayReader from the specified array of chars.

  The resulting reader will start reading at the given offset. The total number of char values that can be read from this reader will be either length or buf.length-offset, whichever is smaller.

  Parameters:

  buf - Input buffer (not copied)

  offset - Offset of the first char to read

  length - Number of chars to read

  Throws:

  IllegalArgumentException - If offset is negative or greater than buf.length, or if length is negative, or if the sum of these two values is negative.

Method Detail

• read

  public int read()
           throws IOException

  Reads a single character.

  Overrides:

  read in class Reader

  Returns:

  The character read, as an integer in the range 0 to 65535 (0x00-0xffff), or -1 if the end of the stream has been reached

  Throws:

  IOException - If an I/O error occurs

• read

  public int read(char[] b,
                  int off,
                  int len)
           throws IOException

  Reads characters into a portion of an array.

  Specified by:

  read in class Reader

  Parameters:

  b - Destination buffer

  off - Offset at which to start storing characters

  len - Maximum number of characters to read

  Returns:

  The actual number of characters read, or -1 if the end of the stream has been reached

  Throws:

  IOException - If an I/O error occurs

• skip

  public long skip(long n)
            throws IOException

  Skips characters. Returns the number of characters that were skipped.

  The n parameter may be negative, even though the skip method of the Reader superclass throws an exception in this case. If n is negative, then this method does nothing and returns 0.

  Overrides:

  skip in class Reader

  Parameters:

  n - The number of characters to skip

  Returns:

  The number of characters actually skipped

  Throws:

  IOException - If the stream is closed, or an I/O error occurs

• ready

  public boolean ready()
                throws IOException

  Tells whether this stream is ready to be read. Character-array readers are always ready to be read.

  Overrides:

  ready in class Reader

  Returns:

  True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.

  Throws:

  IOException - If an I/O error occurs

• markSupported

  public boolean markSupported()

  Tells whether this stream supports the mark() operation, which it does.

  Overrides:

  markSupported in class Reader

  Returns:

  true if and only if this stream supports the mark operation.

• mark

  public void mark(int readAheadLimit)
            throws IOException

  Marks the present position in the stream. Subsequent calls to reset() will reposition the stream to this point.

  Overrides:

  mark in class Reader

  Parameters:

  readAheadLimit - Limit on the number of characters that may be read while still preserving the mark. Because the stream's input comes from a character array, there is no actual limit; hence this argument is ignored.

  Throws:

  IOException - If an I/O error occurs

• reset

  public void reset()
             throws IOException

  Resets the stream to the most recent mark, or to the beginning if it has never been marked.

  Overrides:

  reset in class Reader

  Throws:

  IOException - If an I/O error occurs

• close

  public void close()

  Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), ready(), mark(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.

  Specified by:

  close in interface Closeable

  Specified by:

  close in interface AutoCloseable

  Specified by:

  close in class Reader