package com.company;import java.util.StringJoiner;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) {          StringJoiner stringJoiner=new StringJoiner(", ","SELECT "," FROM "+table);          for(String field:fields){              stringJoiner.add(field);          }          return stringJoiner.toString();    }}