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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)); }