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

Constructor Detail

• StringReader

  public StringReader(String s)

  Creates a new string reader.

  Parameters:

  s - String providing the character stream.

Method Detail

• read

  public int read()
           throws IOException

  Reads a single character.

  Overrides:

  read in class Reader

  Returns:

  The character read, or -1 if the end of the stream has been reached

  Throws:

  IOException - If an I/O error occurs

• read

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

  Reads characters into a portion of an array.

  Specified by:

  read in class Reader

  Parameters:

  cbuf - Destination buffer

  off - Offset at which to start writing characters

  len - Maximum number of characters to read

  Returns:

  The 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 ns)
            throws IOException

  Skips the specified number of characters in the stream. Returns the number of characters that were skipped.

  The ns parameter may be negative, even though the skip method of the Reader superclass throws an exception in this case. Negative values of ns cause the stream to skip backwards. Negative return values indicate a skip backwards. It is not possible to skip backwards past the beginning of the string.

  If the entire string has been read or skipped, then this method has no effect and always returns 0.

  Overrides:

  skip in class Reader

  Parameters:

  ns - The number of characters to skip

  Returns:

  The number of characters actually skipped

  Throws:

  IOException - If an I/O error occurs

• ready

  public boolean ready()
                throws IOException

  Tells whether this stream is ready to be read.

  Overrides:

  ready in class Reader

  Returns:

  True if the next read() is guaranteed not to block for input

  Throws:

  IOException - If the stream is closed

• 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 string, there is no actual limit, so this argument must not be negative, but is otherwise ignored.

  Throws:

  IllegalArgumentException - If readAheadLimit < 0

  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 of the string 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(), or reset() 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