public static void main(String[] args) {
List<String> list = new ArrayList<>();
list.add("laoyi");
list.add("laoer");
list.add("laosan");
if(null ==list && list.size()<=0){
log.info("list内容为空!");
}else{
StringBuilder sb = new StringBuilder();
String resultString = "";
boolean flag = false;
for(String str : list){
if(flag){
sb.append(",");
}else{
flag = true;
}
sb.append(str);
}
resultString = sb.toString();
log.info("最后拼接的字符串结果:" + resultString);
}
}