switch(today){
         case '周一':
         case '周五':
         case '周三':
             System.out.println("吃包子");
            break;
         case '周二':
         case '周四':
         case '周六':
             System.out.println("吃油条");
             break;
            default:
            System.out.println("吃主席套餐");