将String类型的字符串拼接成以逗号分隔的字符输出

package test;
 
import java.util.ArrayList;
import java.util.List;
 
    public class Tesdssss {
        private static List<String> dataList = new ArrayList<String>();
 
        public static void main(String[] args) {
            initList();
            dataToString();
        }
 
        private static void dataToString() {
            StringBuilder sb = new StringBuilder();
            for(int i = 0; i < dataList.size(); i++) {
                if (sb.length() > 0) {//该步即不会第一位有逗号，也防止最后一位拼接逗号！
                    sb.append(",");
           }
                sb.append(dataList.get(i));
            }
            System.out.println(sb.toString());
        }
 
        private static void initList() {
            for(int i =0; i < 6; i++) {
                dataList.add("第"+i+"个字符串");
            }
        }
 
    }