StringWriter class

A character stream that collects its output in a string buffer.

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.

StringWriter append(char c)

Appends the specified character to this writer.

StringWriter append(CharSequence csq)

Appends the specified character sequence to this writer.

StringWriter append(CharSequence csq, int start, int end)

Appends a subsequence of 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(char[] cbuf, int off, int len)

Write a portion of an array of characters.

void write(int c)

Write a single character.

void write(String str)

Write a string.

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

Write a portion of a string.

Revised from Open JDK source code

  import java.io.IOException;
import java.io.StringWriter;

public class Main {
  public static void main(String args[]) throws IOException {
    StringWriter outStream = new StringWriter();
    String s = "This is a test from j a va2s.com.";
    for (int i = 0; i < s.length(); ++i)
      outStream.write(s.charAt(i));
    System.out.println("outstream: " + outStream);
    System.out.println("size: " + outStream.toString().length());
  }
}
  

The output:

outstream: This is a test from j a va2s.com.
size: 33