abstract sclass AbstractOutputStream extends OutputStream {
  public void write(int b) throws IOException {
    write(new byte[] { (byte) b }, 0, 1);
  }
    
  public void write(byte[] b) throws IOException {
    write(b, 0, l(b));
  }
    
  public abstract void write(byte[] buf, int ofs, int len) throws IOException;
}