StringWriter

public class StringWriter extends Writer

A character stream that collects its output in a string buffer, which can then be used to construct a string.

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

Inherited Field Summary

Public Constructor Summary

StringWriter()
Create a new string writer using the default initial string-buffer size.
StringWriter(int initialSize)
Create a new string writer using the specified initial string-buffer size.

Public Method Summary

StringWriter
append(char c)
Appends the specified character to this writer.
StringWriter
append(CharSequence csq, int start, int end)
Appends a subsequence of the specified character sequence to this writer.
StringWriter
append(CharSequence csq)
Appends the specified character sequence to this writer.
void
close()
Closing a StringWriter has no effect.
void
flush()
Flush the stream.
StringBuffer
getBuffer()
Return the string buffer itself.
String
toString()
Return the buffer's current value as a string.
void
write(String str)
Write a string.
void
write(int c)
Write a single character.
void
write(String str, int off, int len)
Write a portion of a string.
void
write(char[] cbuf, int off, int len)
Write a portion of an array of characters.

Inherited Method Summary

Public Constructors

public StringWriter ()

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

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

Public Methods

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) 

Parameters
c The 16-bit character to append
Returns
  • This writer

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()) 

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()

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.

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

public void close ()

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

Throws
IOException

public void flush ()

Flush the stream.

public StringBuffer getBuffer ()

Return the string buffer itself.

Returns
  • StringBuffer holding the current buffer value.

public String toString ()

Return the buffer's current value as a string.

public void write (String str)

Write a string.

Parameters
str String to be written

public void write (int c)

Write a single character.

Parameters
c int specifying a character to be written

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

Write a portion of a string.

Parameters
str String to be written
off Offset from which to start writing characters
len Number of characters to write

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

Write a portion of an array of characters.

Parameters
cbuf Array of characters
off Offset from which to start writing characters
len Number of characters to write