将逗号分隔的字符串添加到ArrayList，反之亦然 [英] Adding comma separated strings to an ArrayList and vice versa

问题描述

如何将逗号分隔的字符串添加到ArrayList？我的字符串returnedItems可能包含1或20个项目，我想将其添加到我的ArrayListselItemArrayList。

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".

填充ArrayList后，我会喜欢稍后迭代它并将项目格式化为逗号分隔的字符串，项目之间没有空格。

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.

推荐答案

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

现在迭代列表并将每个项目附加到StringBuilder：

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();

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