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

Constructor Detail

• StringWriter

  public StringWriter()

  Create a new string writer using the default initial string-buffer size.

• StringWriter

  public StringWriter(int initialSize)

  Create a new string writer using the specified initial string-buffer size.

  Parameters:

  initialSize - The number of char values that will fit into this buffer before it is automatically expanded

  Throws:

  IllegalArgumentException - If initialSize is negative

Method Detail

• write

  public void write(int c)

  Write a single character.

  Overrides:

  write in class Writer

  Parameters:

  c - int specifying a character to be written

• write

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

  Write a portion of an array of characters.

  Specified by:

  write in class Writer

  Parameters:

  cbuf - Array of characters

  off - Offset from which to start writing characters

  len - Number of characters to write

• write

  public void write(String str)

  Write a string.

  Overrides:

  write in class Writer

  Parameters:

  str - String to be written

• write

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

  Write a portion of a string.

  Overrides:

  write in class Writer

  Parameters:

  str - String to be written

  off - Offset from which to start writing characters

  len - Number of characters to write

• append

  public StringWriter 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 StringWriter 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 StringWriter 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

• toString

  public String toString()

  Return the buffer's current value as a string.

  Overrides:

  toString in class Object

  Returns:

  a string representation of the object.

• getBuffer

  public StringBuffer getBuffer()

  Return the string buffer itself.

  Returns:

  StringBuffer holding the current buffer value.

• flush

  public void flush()

  Flush the stream.

  Specified by:

  flush in interface Flushable

  Specified by:

  flush in class Writer

• close

  public void close()
             throws IOException

  Closing a StringWriter has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

  Specified by:

  close in interface Closeable

  Specified by:

  close in interface AutoCloseable

  Specified by:

  close in class Writer

  Throws:

  IOException - If an I/O error occurs