public class Main {

    public static void main(String[] args) {
       String[] fields = { "name", "position", "salary" };       String table = "employee";       String select = buildSelectSql(table, fields);       System.out.println(select);       System.out.println("SELECT name, position, salary FROM employee".equals(select) ? "测试成功" : "测试失败");    }

    static String buildSelectSql(String table, String[] fields) {

       // TODO:       var sj=new StringJoiner(", ","SELECT "," FROM ");       for(String string:fields){
          sj.add(string);       }
       var sb=new StringBuilder();       sb.append(sj).append(table);       return sb.toString();    }

}