Copy chars from a Reader to a Writer. : Copy « File « Java Tutorial

import java.io.IOException;
import java.io.Reader;
import java.io.Writer;

public class Main {
  /**
   * Copy chars from a <code>Reader</code> to a <code>Writer</code>.
   * 
   * This method buffers the input internally, so there is no need to use a
   * <code>BufferedReader</code>.
   * 
   * @param input
   *          the <code>Reader</code> to read from
   * @param output
   *          the <code>Writer</code> to write to
   * @return the number of characters copied
   * @throws NullPointerException
   *           if the input or output is null
   * @throws IOException
   *           if an I/O error occurs
   * @since 1.1
   */
  public static int copy(Reader input, Writer output) throws IOException {
    char[] buffer = new char[1024];
    int count = 0;
    int n = 0;
    while (-1 != (n = input.read(buffer))) {
      output.write(buffer, 0, n);
      count += n;
    }
    return count;
  }
}

11.78.Copy
	11.78.1.	Copy the source file system structure into the supplied target location.
	11.78.2.	Buffered copying between source(InputStream, Reader, String and byte[]) and destinations (OutputStream, Writer, String and byte[]).
	11.78.3.	Copies all data from an input stream to an output stream.
	11.78.4.	Copies the contents of the Reader into the Writer, until the end of the stream has been reached.
	11.78.5.	Copy a directory and all of its contents.
	11.78.6.	Copy a file and user buffer
	11.78.7.	Copy chars from a Reader to a Writer.
	11.78.8.	copy Completely (InputStream input, OutputStream output)
	11.78.9.	copy Completely (Reader input, Writer output)
	11.78.10.	copy Completely(URI input, URI output)
	11.78.11.	Buffered copying
	11.78.12.	Copy file and directory