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Java list轉成String

public static  <T extends  Object>  String listToString(List<T> list){
   StringBuilder sb=new StringBuilder();
   for(T item : list){
      if(sb.length()==0) {
         sb.append(item.toString());
      } else {
         sb.append(","+item.toString());
      }
   }
   return sb.toString();
}