Java List和String互相转换

public class StringUtil {

    
    public static String list2Str(List stringList){
        String str = String.join(",", stringList);
        return str;
    }


    
    public static List str2List(String str){
        if(str == null || str .equals("")){
            return null;
        }
        List stringList = Arrays.asList(str.split(","));
        return stringList;
    }
}