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






  1. Java
  2. File Input Output
  3. Copy

Copy chars from a Reader to a Writer.

  
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>.
   * <p>
   * 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;
  }
}








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