import java.util.StringJoiner;

public class main1 {

    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 field:fields) {

    sj.add(field);

    }

        return ""+sj+table;

    }

}