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

Field Detail

• buf

  protected char[] buf

  The buffer where data is stored.

• count

  protected int count

  The number of chars in the buffer.

Constructor Detail

• CharArrayWriter

  public CharArrayWriter()

  Creates a new CharArrayWriter.

• CharArrayWriter

  public CharArrayWriter(int initialSize)

  Creates a new CharArrayWriter with the specified initial size.

  Parameters:

  initialSize - an int specifying the initial buffer size.

  Throws:

  IllegalArgumentException - if initialSize is negative

Method Detail

• write

  public void write(int c)

  Writes a character to the buffer.

  Overrides:

  write in class Writer

  Parameters:

  c - int specifying a character to be written

• write

  public void write(char[] c,
                    int off,
                    int len)

  Writes characters to the buffer.

  Specified by:

  write in class Writer

  Parameters:

  c - the data to be written

  off - the start offset in the data

  len - the number of chars that are written

• write

  public void write(String str,
                    int off,
                    int len)

  Write a portion of a string to the buffer.

  Overrides:

  write in class Writer

  Parameters:

  str - String to be written from

  off - Offset from which to start reading characters

  len - Number of characters to be written

• writeTo

  public void writeTo(Writer out)
               throws IOException

  Writes the contents of the buffer to another character stream.

  Parameters:

  out - the output stream to write to

  Throws:

  IOException - If an I/O error occurs.

• append

  public CharArrayWriter append(CharSequence csq)

  Appends the specified character sequence to this writer.

  An invocation of this method of the form out.append(csq) behaves in exactly the same way as the invocation

       out.write(csq.toString()) 

  Depending on the specification of toString for the character sequence csq, the entire sequence may not be appended. For instance, invoking the toString method of a character buffer will return a subsequence whose content depends upon the buffer's position and limit.

  Specified by:

  append in interface Appendable

  Overrides:

  append in class Writer

  Parameters:

  csq - The character sequence to append. If csq is null, then the four characters "null" are appended to this writer.

  Returns:

  This writer

  Since:

  1.5

• append

  public CharArrayWriter append(CharSequence csq,
                                int start,
                                int end)

  Appends a subsequence of the specified character sequence to this writer.

  An invocation of this method of the form out.append(csq, start, end) when csq is not null, behaves in exactly the same way as the invocation

       out.write(csq.subSequence(start, end).toString()) 

  Specified by:

  append in interface Appendable

  Overrides:

  append in class Writer

  Parameters:

  csq - The character sequence from which a subsequence will be appended. If csq is null, then characters will be appended as if csq contained the four characters "null".

  start - The index of the first character in the subsequence

  end - The index of the character following the last character in the subsequence

  Returns:

  This writer

  Throws:

  IndexOutOfBoundsException - If start or end are negative, start is greater than end, or end is greater than csq.length()

  Since:

  1.5

• append

  public CharArrayWriter append(char c)

  Appends the specified character to this writer.

  An invocation of this method of the form out.append(c) behaves in exactly the same way as the invocation

       out.write(c) 

  Specified by:

  append in interface Appendable

  Overrides:

  append in class Writer

  Parameters:

  c - The 16-bit character to append

  Returns:

  This writer

  Since:

  1.5

• reset

  public void reset()

  Resets the buffer so that you can use it again without throwing away the already allocated buffer.

• toCharArray

  public char[] toCharArray()

  Returns a copy of the input data.

  Returns:

  an array of chars copied from the input data.

• size

  public int size()

  Returns the current size of the buffer.

  Returns:

  an int representing the current size of the buffer.

• toString

  public String toString()

  Converts input data to a string.

  Overrides:

  toString in class Object

  Returns:

  the string.

• flush

  public void flush()

  Flush the stream.

  Specified by:

  flush in interface Flushable

  Specified by:

  flush in class Writer

• close

  public void close()

  Close the stream. This method does not release the buffer, since its contents might still be required. Note: Invoking this method in this class will have no effect.

  Specified by:

  close in interface Closeable

  Specified by:

  close in interface AutoCloseable

  Specified by:

  close in class Writer