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){        // TODO:        StringJoiner s= new StringJoiner(", ","SELECT "," FROM "+table);        for (String name : fields) {            s.add(name);        }        return s.toString();    }}