Java基础实现自动贩卖机

通过JavaSE的选择、循环、方法的重写、有参构造等知识点模拟实现自动贩卖机的功能

User，用户操作端

import java.util.Scanner;public class User {public static void main(String[] args) {Scanner sc = new Scanner(System.in);shopping shopping = new shopping();System.out.println("欢迎使用自动贩卖机");System.out.println("是否进行购物：1、是\t2、否");int select = sc.nextInt();if (select == 1){shopping.show(1);System.out.println("请选择相应序号");int choose = sc.nextInt();while (choose >= 5){if (choose == 5){System.out.println("库存充足哟。。。");System.out.println("请再次选择相应序号");}else {System.out.println("没有此商品，请重新选择");}choose = sc.nextInt();}System.out.println("请输入购买数量");int num = sc.nextInt();while (true){shopping.shop(choose,num);System.out.println();shopping.show();System.out.println("如继续购物，请再次选择相应序号");choose = sc.nextInt();while (choose >= 6){if (choose == 6){shopping.shop(6);System.out.println("请再次选择相应序号");}else {System.out.println("没有此商品，请重新选择");}choose = sc.nextInt();}if(choose == 5){System.out.println("欢迎下次光临！");break;}System.out.println("请输入购买数量");num = sc.nextInt();}}else {System.out.println("欢迎下次光临！");}}
}

shopping，数据处理

public class shopping {goods cola = new goods("可口可乐",3,10);goods noodles = new goods("红烧牛肉面",5.5,10);goods ham = new goods("火腿肠",2.5,10);goods spicy = new goods("卫龙",0.5,100);public void show(){System.out.println("现还有以下商品供您选择：");System.out.println("1、"+cola.goodsname+"\t价格："+cola.price+"\t剩余："+cola.number);System.out.println("2、"+noodles.goodsname+"\t价格："+noodles.price+"\t剩余："+noodles.number);System.out.println("3、"+ham.goodsname+"\t价格："+ham.price+"\t剩余："+ham.number);System.out.println("4、"+spicy.goodsname+"\t价格："+spicy.price+"\t剩余："+spicy.number);System.out.println("5、退出购物");System.out.println("6、一键补货");}public void show(int i){System.out.println("现还有以下商品供您选择：");System.out.println("1、"+cola.goodsname+"\t价格："+cola.price+"\t剩余："+cola.number);System.out.println("2、"+noodles.goodsname+"\t价格："+noodles.price+"\t剩余："+noodles.number);System.out.println("3、"+ham.goodsname+"\t价格："+ham.price+"\t剩余："+ham.number);System.out.println("4、"+spicy.goodsname+"\t价格："+spicy.price+"\t剩余："+spicy.number);System.out.println("5、一键补货");}public void shop(int choose,int num){switch (choose){case 1:if(cola.number == 0){System.out.println("已售罄，等待补货！");}else if (num>cola.number){System.out.println("库存不足，请重新选择");}else {cola.number = cola.number - num;success();}break;case 2:if(noodles.number == 0){System.out.println("已售罄，等待补货！");}else if (num>noodles.number){System.out.println("库存不足，请重新选择");}else {noodles.number = noodles.number - num;success();}break;case 3:if(ham.number == 0){System.out.println("已售罄，等待补货！");}else if (num>ham.number){System.out.println("库存不足，请重新选择");}else {ham.number = ham.number - num;success();}break;case 4:if(spicy.number == 0){System.out.println("已售罄，等待补货！");}else if (num>spicy.number){System.out.println("库存不足，请重新选择");}else {spicy.number = spicy.number - num;success();}break;case 5:System.out.println("欢迎下次光临！");break;case 6:System.out.println("补货ing......");this.cola.number = 10;this.noodles.number = 10;this.ham.number = 10;this.spicy.number = 100;break;default:System.out.println("没有此商品，请重新选择");break;}}public void shop(int choose){switch (choose){case 5:System.out.println("欢迎下次光临！");break;case 6:System.out.println("补货ing......");System.out.println("补货完毕");System.out.println();this.cola.number = 10;this.noodles.number = 10;this.ham.number = 10;this.spicy.number = 100;break;default:System.out.println("没有此商品，请重新选择");break;}}public void success(){System.out.println("扫码支付中。。。");System.out.println("正在处理。。。");System.out.println("购买成功！");}
}

goods，构造

public class goods {String goodsname;   //商品名double price;          //价格int number;         //剩余数量public goods() {}public goods(String goodsname, double price, int number) {this.goodsname = goodsname;this.price = price;this.number = number;}
}

效果如下：

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