Java案例，超市购物(添加，删除，查看商品)

导语：面向对象的笔记还在整理，之前的笔记也有点凌乱，先发一个国庆期间做的一个超市购物的案例。主要的功能是顾客查看，购买，结算商品、管理员添加，删除，查看商品。

1.实体包

//管理员账号实体类 public class Admin { private String id;//管理员帐号 private String passWord;//管理员密码 public Admin() { super(); } public Admin(String id, String passWord) { super(); this.id = id; this.passWord = passWord; } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getPassWord() { return passWord; } public void setPassWord(String passWord) { this.passWord = passWord; } } //商品实体类 public class Product { private int id;//商品序号 private String name;//商品名称 private float price;//商品价格 private int nums;//商品数量 public static Product[] goodList = new Product[200];//存储商品的数组 public Product() { super(); } public Product(int num, String name, float price,int nums) { super(); this.id = num; this.name = name; this.price = price; this.nums = nums; } public int getNums() { return nums; } public void setNums(int nums) { this.nums = nums; } public int getId() { return id; } public void setId(int num) { this.id = num; } public String getName() { return name; } public void setName(String name) { this.name = name; } public float getPrice() { return price; } public void setPrice(float price) { this.price = price; } } //购物车实体类 public class ShopCar { public static Product[] shopCars = new Product[200];//存储商品的数组 public ShopCar() { super(); } }

2.界面包

import java.util.Scanner; import util.AdminUtil; import util.GoodsUtil; public class AdminUI { private static Scanner adminInput = new Scanner(System.in); //管理员操作界面 public static void adminUI() { int inputNums = 0; //管理员账号登陆 while(true) { System.out.println("请输入管理员账号"); String adminId = adminInput.next(); System.out.println("请输入管理员密码"); String passWord = adminInput.next(); if(adminId.equals( AdminUtil.getAdmin().getId()) && passWord.equals(AdminUtil.getAdmin().getPassWord())){ break; }else { if(inputNums == 2) { System.out.println("输入次数已上线，退出管理员登陆！"); return; }else { System.out.println("账号密码错误"); } } inputNums++; } //管理员操作 while(true) { System.out.println("1.管理员添加商品2.管理员删除商品3.显示商品列表4.退出管理员操作"); int choice = adminInput.nextInt(); if(choice == 1) { System.out.println("请输入商品的编号"); int id = adminInput.nextInt(); System.out.println("请输入商品的名字"); String name = adminInput.next(); System.out.println("请输入商品的价格"); float price = adminInput.nextFloat(); System.out.println("请输入商品的数量"); int nums = adminInput.nextInt(); GoodsUtil.addGoods(id, name, price, nums); }else if(choice == 2) { System.out.println("请输入你要删除的商品的序号"); int deletenum = adminInput.nextInt(); GoodsUtil.deleteGoods(deletenum); }else if(choice == 3) { GoodsUtil.showGoods(); }else if(choice == 4) { break; }else { System.out.println("请输入正确的数字！"); } } } } import java.util.Scanner; import entity.ShopCar; import util.ShopCarUtil; public class ShoppingCarUI { private static Scanner input = new Scanner(System.in); //购物车界面 public static void shoppingCarUI(){ while(true) { ShopCarUtil.showShopCar(); if(ShopCar.shopCars[0] == null) { return; } System.out.println("1.删除商品2.清空购物车3.返回上一层"); int choice = input.nextInt(); if(choice == 1) { System.out.println("请输入你要删除商品的序号"); int deleteNum = input.nextInt(); ShopCarUtil.deleteAccounts(deleteNum); }else if(choice == 2) { ShopCarUtil.clearShopCar(); }else if(choice ==3) { break; }else { System.out.println("输入错误，请输入正确的数字！"); } } } } import java.util.Scanner; import entity.Product; import util.ShopCarUtil; import util.GoodsUtil; //购物车界面 public class ShoppingUI { Scanner input = new Scanner(System.in); public void showShopping() { /* * 超市的界面方法 */ while(true) { System.out.println("--------------欢迎来到Java超市--------------"); System.out.println("1.显示商品列表2.购买商品3.查看购物车列表4.结算5.管理员登陆6.退出"); int choice = input.nextInt(); if(choice == 1) { GoodsUtil.showGoods(); }else if(choice == 2){ int list; int nums; while(true) { System.out.println("请输入你要添加商品的序号"); list = input.nextInt(); if(list < GoodsUtil.addProduct) { break; }else { System.out.println("请输入正确的商品序号！"); } } while(true) { System.out.println("请输入你要添加商品的数量"); nums = input.nextInt(); if(nums < Product.goodList[nums - 1].getNums()) { break; }else { System.out.println("商品库存不足，请重新输入！"); } } ShopCarUtil.addGoodsCar(list,nums); }else if(choice ==3) { ShoppingCarUI.shoppingCarUI(); }else if(choice ==4) { int allPrice = ShopCarUtil.settleAccounts(); if(allPrice == 0) { System.out.println("请先购买商品！"); return; } System.out.println("总价为：" + allPrice); }else if(choice ==5) { AdminUI.adminUI(); }else if(choice ==6) { System.out.println("期待您的下次光临!"); break; }else { System.out.println("请输入正确的数字"); } } } }

3.工具包

import entity.Admin; public class AdminUtil { //创建管理员帐号 static Admin admin = new Admin("admin","123456"); public static Admin getAdmin() { return admin; } public static void setAdmin(Admin admin) { AdminUtil.admin = admin; } } import entity.Product; //商品工具类 public class GoodsUtil { private static int numsProduct = 0;//打印商品列表商品的序号 public static int addProduct = 0;//添加商品的数组角标 //初始化商品 static { Product p1 = new Product(1001,"茄子",1.5f,100); Product p2 = new Product(1002,"萝卜",1.7f,100); Product p3 = new Product(1003,"黄瓜",2.3f,100); Product.goodList[addProduct++] = p1; Product.goodList[addProduct++] = p2; Product.goodList[addProduct++] = p3;//addProduct = 3 } //显示商品列表 public static void showGoods() { numsProduct = 1; System.out.println("序号\t" + "商品编号\t" + "商品名称\t" + "商品价格\t" + "商品数量\t"); for(Product p :Product.goodList) { if(p != null) { System.out.print(numsProduct++ + "\t" + p.getId() + "\t" + p.getName() + "\t" + p.getPrice() + "\t" + p.getNums() + "\t" ); System.out.println(); }else { break; } } } //管理员添加商品 public static void addGoods(int id,String name,float price,int nums) { Product newProduct = new Product(id,name,price,nums); Product.goodList[addProduct++] = newProduct; } //管理员删除商品 public static void deleteGoods(int deletenum) { //将商品的后一个商品覆盖前一个商品，来删除商品 for(int i = deletenum - 1;i < Product.goodList.length;i++ ) { if(Product.goodList[i + 1] == null) { Product.goodList[i] = Product.goodList[i + 1]; break; }else { Product.goodList[i] = Product.goodList[i + 1]; } } addProduct--; } } import entity.Product; import entity.ShopCar; //购物车工具类 public class ShopCarUtil { private static int nums = 0; public static int numsShopCarProduct = 0; //添加商品，将商品写入购物车 public static void addGoodsCar(int id,int goodsNum) { Product addGoods = Product.goodList[id - 1]; Product shopCar = new Product(); shopCar.setId(addGoods.getId()); shopCar.setName(addGoods.getName()); shopCar.setPrice(addGoods.getPrice()); shopCar.setNums(goodsNum); int goodsnums = addGoods.getNums(); if((goodsnums - goodsNum) >= 0) { addGoods.setNums(goodsnums - goodsNum); }else { System.out.println("库存不足，请重新选择！"); return; } ShopCar.shopCars[nums++] = shopCar; } //显示购物车列表 public static void showShopCar() { if(ShopCar.shopCars[0] == null) { System.out.println("您的购物车是空的，请先购买商品在查看！"); return; } numsShopCarProduct = 1; System.out.println("------------------你的购物车-------------------"); System.out.println("序号\t" + "商品编号\t" + "商品名称\t" + "商品价格\t" + "商品数量\t"); for(Product p :ShopCar.shopCars) { if(p != null) { System.out.print(numsShopCarProduct++ + "\t" + p.getId() + "\t" + p.getName() + "\t" + p.getPrice() + "\t" + p.getNums() + "\t" ); System.out.println(); }else { break; } } } //结算 public static int settleAccounts() { int allPrice = 0; for(Product p :ShopCar.shopCars) { if(p != null) { allPrice += p.getPrice()*p.getNums(); }else { break; } } return allPrice; } //删除购物车商品 public static void deleteAccounts(int deletenum) { ShopCarUtil.returnNums(deletenum - 1); //将商品的后一个商品覆盖前一个商品，来删除商品 for(int i = deletenum - 1;i < ShopCar.shopCars.length;i++ ) { if(ShopCar.shopCars[i + 1] == null) { ShopCar.shopCars[i] = ShopCar.shopCars[i + 1]; break; }else { ShopCar.shopCars[i] = ShopCar.shopCars[i + 1]; } } ShopCarUtil.nums--; } //清空购物车 public static void clearShopCar() { for(int i = 0;i < ShopCar.shopCars.length;i++) { if(ShopCar.shopCars[i] != null) { ShopCarUtil.returnNums(i); }else { break; } } for(int i = 0;i < ShopCar.shopCars.length;i++) { if(ShopCar.shopCars[i] != null) { ShopCar.shopCars[i] = null; }else { break; } } } //将删除商品的数量返回至商品列表 public static void returnNums(int deletenum) { Product delAccount = ShopCar.shopCars[deletenum]; for(Product p :Product.goodList) { if(p.getId() == delAccount.getId()) { int nums = p.getNums() + delAccount.getNums(); p.setNums(nums); break; } } } }