做Java小项目(一)--点菜系统

 学完JavaSE和学了一部分JavaEE(刚学到CSS).在B站找了一些小项目来复习一些语法知识,如有错误,望大家指正

/*
1.首先建立的是菜单显示,用到了ArrayList来储存每一个菜的信息
2.之后开始服务显示主菜单
3.开始关于选择需求
4.一些基本逻辑
用到的知识:
1.ArrayList<>    //用于储存菜单名称
2.Scanner的输入   //用于反馈用户的选择
3.switch         //针对用户的选择
4.DecimalFormat  //关于小数点的保留
5.增强for循环

 */
 

package FirstProject;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;public class DishApp {static List<Dish> dishList=new ArrayList<>();//用到了多态List-ArrayListstatic List<Dish> alreadyOrder=new ArrayList<>();//用户已点的菜单static double sum=0;public static void main(String[] args) {addDish();//初始化菜单Scanner sc=new Scanner(System.in);while(true) {showMenu();//显示主菜单int num = sc.nextInt();switch (num) {case 1:showMenuList();while (true) {int num1 = sc.nextInt();if (num1 == 0) break;else {System.out.println("亲,您点了" + dishList.get(num1 - 1).name);alreadyOrder.add(dishList.get(num1 - 1));}}break;case 2:showAlreadyM();while (true){int num1=sc.nextInt();if (num1==0)  break;}break;case 3:getSum();return;}}}public static void addDish(){Dish dish=new Dish(1,"爆炒土豆",18.88);dishList.add(dish);dishList.add(new Dish(2,"地三鲜",24.88));//简便写法dishList.add(new Dish(3,"牛腩盖饭",35.88));dishList.add(new Dish(4,"水煮鱼",43.88));dishList.add(new Dish(5,"全家福",88.88));}public static  void showMenu(){System.out.println("-----主菜单-----");System.out.println("点菜\t\t\t1");System.out.println("已点菜系\t\t2");System.out.println("买单\t\t\t3");System.out.println("---请选择你需要的服务---");}public static void showMenuList(){System.out.println("---请您点菜---");//开始对数组进行遍历for (int i = 0; i <dishList.size() ; i++) {Dish dish = dishList.get(i);System.out.println(dish.number + dish.name + dish.price);}System.out.println("--开始输入序号点菜,点击0可以返回主菜单--");}public static void showAlreadyM(){System.out.println("--您好,这是您的菜--");for (Dish dish :alreadyOrder) {System.out.println(dish.name);}System.out.println("点击0可以返回主菜单--");}public static void getSum(){for (int i = 0; i < alreadyOrder.size(); i++) {sum+=alreadyOrder.get(i).price;}DecimalFormat df = new DecimalFormat("#.00");//保留小数点两位// 符号#（代表一个或多个数字，如果不存在则显示为空）System.out.println("您好,本次消费一共:"+df.format(sum));}
}

 这是我在B站找的视频,很乐意分享给大家每天1个java练习小项目，java7日项目思维养成_哔哩哔哩_bilibilihttps://www.bilibili.com/video/BV1Aq4y1W79E?p=1