字符串returnedItems =A，B，C;
清单＆LT;串GT; sellItems = Arrays.asList（returnedItems.split（，））;
 

现在遍历列表，每个项目追加到StringBuilder的：

  StringBuilder的SB =新的StringBuilder（）;
对于（字符串项：sellItems）{
    如果（sb.length（）大于0）{
        sb.append（，）;
    }
    sb.append（项目）;
}
字符串结果= sb.toString（）;
 

How to add a comma separated string to an ArrayList? My string "returnedItems" could hold 1 or 20 items which I'd like to add to my ArrayList "selItemArrayList".

After the ArrayList has been populated, I'd like to later iterate through it and format the items into a comma separated string with no spaces between the items.

String returnedItems = "a,b,c";
List<String> sellItems = Arrays.asList(returnedItems.split(","));

Now iterate over the list and append each item to a StringBuilder:

StringBuilder sb = new StringBuilder();
for(String item: sellItems){
    if(sb.length() > 0){
        sb.append(',');
    }
    sb.append(item);
}
String result = sb.toString();