Java 将List集合转换为以字符分割的字符串

    /**
     * 集合转换为字符串
     *
     * @param list
     * @param separator
     * @return
     */
    public String listToString(List list, char separator) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < list.size(); i++) {
            sb.append(list.get(i)).append(separator);
        }
        return sb.toString().substring(0, sb.toString().length() - 1);
    }


     public String listToString(List list, char separator) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < list.size(); i++) {
            if (i == list.size() - 1) {
                sb.append(list.get(i));
            } else {
                sb.append(list.get(i));
                sb.append(separator);
            }
        }
        return sb.toString();
    }

     public String listToString(List list, char separator) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < list.size(); i++) {
            sb.append(list.get(i));
            if (i < list.size() - 1) {
                sb.append(separator);
            }
        }
        return sb.toString();
    }

或者

public class Separator {
   private String next = "";
   private String separator;

   public Separator(String separator) {
       this.separator = separator;
   }

   public String get() {
       String result = next;
       next = separator;
       return result;
   }


   public String listToString(List<String> list, Separator separator) {
       StringBuilder sb = new StringBuilder();
       for (String s : list) {
           if (s != null && !"".equals(s)) {
               sb.append(separator.get()).append(s);
           }
       }
       return sb.toString();
   }
}

或者最原始的字符串拼接拆分方法

      String  str = "A,B,C";
        if(!TextUtils.isEmpty(str )){
            String[] array= str .split(",");
            for(int i =0;i<array.length;i++){
                list.add(array[i]);
         }
      }     

参考链接：https://blog.csdn.net/fanyuna/article/details/37569885