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   for (int i<0; i< array.size(); i++) {
      String result = "PR-" + array[i] + "-RD";
      file.write(result);
   }

   int size = array.size();
   for (int i<0; i< size; i++) {

  StringBuffer sb = new StringBuffer();
  int size = array.size();
...
     file.write(sb.toString());
     sb.length(0);
  }