Question

可能重复：
The most sophisticated way for creating comma-separated Strings from a Collection/Array/List?

我有一个集合

我希望从Collection对象中获取一个String对象，其元素与逗号分隔。

例如

      Collection<String> = [1,2,3..]
      String temp = "1,2,3,4....";

Answer 1

public static String getCsv(List<String> list) {
    if (list == null)
        return null;
    StringBuilder buff = new StringBuilder();
    for(int i=0; i<list.size(); i++){
          String item = list[i];
          if (i!=0)
              buff.append(",");
          buff.append(item);
    }
    return buff.toString();
 }

Answer 2

遍历您的集合并使用StringBuilder并附加每个元素和逗号。如果集合中有超过0个元素，则删除最后一个逗号。

public static String getMyString(Collection<String> coll) { 
    StringBuilder sb = new StringBuilder();
    for (String str : coll) {
        sb.append(str).append(",");
    }

    if (coll.size() > 0) {
        sb.delete(sb.length()-1,sb.length());
    }
    return sb.toString();
}

将Collection <string>转换为逗号分隔值</string>

2 个答案: