Map集合实现的纯java购物车

最新推荐文章于 2022-06-18 09:20:54 发布

原创最新推荐文章于 2022-06-18 09:20:54 发布 · 4k 阅读

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CC 4.0 BY-SA版权

本文介绍了一个简单的购物车系统实现，包括商品和商品项类定义，以及购物车类的方法实现，如添加、删除商品及计算总价等功能。

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Product.java

public class Product {
private Integer productid;
private String productname;
private String category;
private float price;
private String picture;
public Product(Integer productid, String productname, String category, float price, String picture) {
this.productid = productid;
this.productname = productname;
this.category = category;
this.price = price;
this.picture = picture;
}
public Integer getProductid() {
return productid;
}
public void setProductid(Integer productid) {
this.productid = productid;
}
public String getProductname() {
return productname;
}
public void setProductname(String productname) {
this.productname = productname;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
public String getPicture() {
return picture;
}
public void setPicture(String picture) {
this.picture = picture;
}
}

ProductIem.java

public class ProductItem {
private Product product;
private Integer count;
public ProductItem(Product product, Integer count) {
this.product = product;
this.count = count;
}
public Product getProduct() {
return product;
}
public void setProduct(Product product) {
this.product = product;
}
public Integer getCount() {
return count;
}
public void setCount(Integer count) {
this.count = count;
}
public float getTotalPrice() {
return this.product.getPrice()*count;
}
}

ShoppingCart.java

import java.util.HashMap;
import java.util.Scanner;

import javax.swing.plaf.synth.SynthSeparatorUI;

public class ShoppingCart {
private HashMap<Integer, ProductItem> items = new HashMap<Integer, ProductItem>();
public static void main(String[] args) {
ShoppingCart cart = new ShoppingCart();
System.out.println("初始化产品");
Product banana = new Product(10000, "香蕉", "水果", 2.50F, "banana.jpg");
Product apple = new Product(10001, "苹果", "水果", 3.99F, "apple.jpg");
Product orange = new Product(10002, "桔子", "水果", 1.80F, "orange.jpg");
Product pen = new Product(10003, "钢笔", "文具", 12.00F, "pen.jpg");
Product pencil = new Product(10004, "铅笔", "文具", 1.00F, "pencil.jpg");
cart.addToCart(apple);
cart.addToCart(apple);
while(true){
System.out.println("\t1 查看全部");
System.out.println("\t2 添加东西");
System.out.println("\t3 删除东西");
System.out.println("\t4 修改数量");
System.out.println("\t5 结账");
System.out.println("\t6 退出");
System.out.print("请选择[1-6]:");
System.out.println("请输入你的操作");
Scanner sc=new Scanner(System.in);
String x=sc.nextLine();
switch (x) {
case "1":

System.out.println(cart.showAll());
break;
case "2":
System.out.println("添加的水果,请输入");
x=sc.nextLine();
//System.out.println(x);
if(x.equals(banana.getProductname())){
cart.addToCart(banana);
}
if(x.equals(pencil.getProductname())){
cart.addToCart(pencil);
}
if(x.equals(pen.getProductname())){
cart.addToCart(pen);
}
if(x.equals(orange.getProductname())){
cart.addToCart(orange);
}
if(x.equals(apple.getProductname())){
cart.addToCart(apple);
//System.out.println(apple.getProductname());
}
//System.out.println(cart.showAll());

//cart.addToCart(product);
break;
case "3":
System.out.println("请输入要删除的东西");
x=sc.nextLine();
if(x.equals(banana.getProductname())){
cart.delFromCart(banana);
}
if(x.equals(pencil.getProductname())){
cart.delFromCart(pencil);
}
if(x.equals(pen.getProductname())){
cart.delFromCart(pen);
}
if(x.equals(orange.getProductname())){
cart.delFromCart(orange);
}
if(x.equals(apple.getProductname())){
cart.delFromCart(apple);
}
//cart.delFromCart()
break;
case "4":
System.out.println("请输入要修改的东西名和数量");
x=sc.nextLine();
System.out.println("请输入要修改的东西名的数量");
int s=sc.nextInt();
if(x.equals(banana.getProductname())){
cart.modifyCart(banana,s);
}
if(x.equals(pencil.getProductname())){
cart.modifyCart(pencil,s);
}
if(x.equals(pen.getProductname())){
cart.modifyCart(pen,s);
}
if(x.equals(orange.getProductname())){
cart.modifyCart(orange,s);
}
if(x.equals(apple.getProductname())){
cart.modifyCart(apple,s);
//System.out.println(apple.getProductname());
}
//modifyCart(x,s);
break;
case "5":
System.out.println(cart.getTotalPrice());
break;
case "6":
System.exit(0);;
break;
default:
break;
}
/* System.out.println("###############################################");
System.out.println("添加苹果");
cart.addToCart(apple);
System.out.println(cart.showAll());
System.out.println("当前购物车总价：" + cart.getTotalPrice());
System.out.println("***********************************************");
System.out.println("添加香蕉");
cart.addToCart(banana);
System.out.println(cart.showAll());
System.out.println("当前购物车总价：" + cart.getTotalPrice());
System.out.println("***********************************************");
System.out.println("修改香蕉数量");
cart.modifyCart(banana, 5);
System.out.println(cart.showAll());
System.out.println("当前购物车总价：" + cart.getTotalPrice());
System.out.println("***********************************************");
System.out.println("删除苹果");
cart.delFromCart(apple);
System.out.println(cart.showAll());
System.out.println("当前购物车总价：" + cart.getTotalPrice());
System.out.println("***********************************************");
System.out.println("添加铅笔");
cart.addToCart(pencil);
System.out.println(cart.showAll());
System.out.println("当前购物车总价：" + cart.getTotalPrice());
System.out.println("***********************************************");*/
}
}
public void addToCart(Product product) {
this.items.put(product.getProductid(), new ProductItem(product, 1));
}
public void delFromCart(Product product) {
this.items.remove(product.getProductid());
}
public String showAll() {
String detail = "";
for (Integer key : this.items.keySet()) {
detail += this.items.get(key).getProduct().getProductname() + ":" + this.items.get(key).getCount() + "件，单价 " + this.items.get(key).getProduct().getPrice() + "，小计" + this.items.get(key).getTotalPrice() + "\n";
}
return detail;
}
public boolean modifyCart(Product product, Integer count) {
if (this.items.containsKey(product.getProductid())) {
this.items.get(product.getProductid()).setCount(count);
return true;
}
return false;
}
public float getTotalPrice() {
float total = 0;
for (Integer key : this.items.keySet()) {
total += this.items.get(key).getTotalPrice();
}
return total;

}
}