public Command(String data) 
{ 
  StringTokenizer st = new StringTokenizer(data,","); 
  if (st.countTokens() < 3) 
  {  // empty data 
    type = null; 
    item = null; 
    number = 0; 
  } 
  else 
  { 
    type = st.nextToken().trim(); 
    item = st.nextToken().trim(); 
    number = Integer.parseInt(st.nextToken().trim()); 
  } 
} 
 
public Command (byte[] data) 
{ 
  this(new String(data)); 
}