菜品管理案例

package com.ArrayList;
//菜品管理
public class Demo2 {
    public static void main(String[] args) {
        Demo22 manager=new Demo22();
        manager.start();
    }
}

package com.ArrayList;
//构造器
public class Demo21 {
    private String name;
    private double originalPrice;
    private double specialPrice;
    private String info;

    //无参构造器
    public Demo21() {
    }

    //有参构造器
    public Demo21(String name, double originalPrice, double specialPrice, String info) {
        this.name = name;
        this.originalPrice = originalPrice;
        this.specialPrice = specialPrice;
        this.info = info;
    }

    //get和set
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getOriginalPrice() {
        return originalPrice;
    }

    public void setOriginalPrice(double originalPrice) {
        this.originalPrice = originalPrice;
    }

    public double getSpecialPrice() {
        return specialPrice;
    }

    public void setSpecialPrice(double specialPrice) {
        this.specialPrice = specialPrice;
    }

    public String getInfo() {
        return info;
    }

    public void setInfo(String info) {
        this.info = info;
    }
}

package com.ArrayList;

import java.util.ArrayList;
import java.util.Scanner;

public class Demo22 {
    private ArrayList<Demo21> foods=new ArrayList<>();
    private Scanner sc=new Scanner(System.in);
    //商家上架菜品
    public void add(){
        System.out.println("==菜品上架==");
        //创建一个才能对象
        Demo21 food=new Demo21();
        System.out.println("请您输入上架菜品的名称:");
        String name=sc.next();
        food.setName(name);

        System.out.println("请您输入上架菜品的原价:");
        double originalPrice=sc.nextDouble();
        food.setOriginalPrice(originalPrice);

        System.out.println("请您输入上架菜品的优惠价:");
        double specialPrice=sc.nextDouble();
        food.setSpecialPrice(specialPrice);

        System.out.println("请您输入上架菜品的其他信息:");
        String info=sc.next();
        food.setInfo(info);

        //把菜品对象添加到集合容器中去
        foods.add(food);
        System.out.println("恭喜您上架成功！");
    }
    //菜品浏览功能
    public void printALLFoods(){
        System.out.println("当前菜品信息如下：");
        for (int i = 0; i < foods.size(); i++) {
            Demo21 food=foods.get(i);
            System.out.println("菜品名称："+food.getName());
            System.out.println("菜品原价："+food.getOriginalPrice());
            System.out.println("菜品优惠价："+food.getSpecialPrice());
            System.out.println("其他描述信息："+food.getInfo());
            System.out.println("---------------------------------------------");
        }
    }

    //专门负责展示系统界面

    public void start(){
        while (true) {
            System.out.println("欢迎进入商家后台管理系统");
            System.out.println("1.上架菜品（add）");
            System.out.println("2.浏览菜品（query）");
            System.out.println("3.退出系统（exit）");
            System.out.println("请您选择操作指令：");
            String command=sc.next();
            switch (command){
                case "add":
                    add();
                    break;
                case "query" :
                    printALLFoods();
                    break;
                case "exit":
                    return;//结束当前方法
                default:
                    System.out.println("您输入的操作命令有误");
            }
        }
    }




}