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) {
              var S = new StringJoiner(", ", "SELECT ", " FROM "+table);
              for(String s : fields) {
                     S.add(s);
              }
              return "" + S;
       }
}