通过Java语言实现一个基础的购物车功能
首先对购物车就进行功能分析:
1,能够存入商品(商品增添)
2,可以对购物车内的商品进行数量上的加减(删除商品)
3,能够对购物车内的物品进行信息查询(查看购物车商品信息)
4,能够计算商品总价格并产生一个清单(结账,发票)
思路:使用一个Map集合,然后将各个功能写好后直接调用以达到购物车的基础功能
1,购物车系统
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
class Goods{
private Integer id;
private String name;
private double price;
private Integer numbers;
Goods(){}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double jia) {
this.price = jia;
}
public Integer getNumbers() {
return numbers;
}
public void setNumbers(Integer numbers) {
this.numbers = numbers;
}
2,增添商品
public class GouWu {
Map<Integer,Goods> al=new HashMap<Integer,Goods>();
public void cun() {
Scanner sc=new Scanner(System.in);
System.out.println("请输入商品的编号");
Integer id = sc.nextInt();
Goods m=new Goods();
if(al.containsKey(id)) {
al.get(id).setNumbers((al.get(id).getNumbers()+1));
}else {
m.setId(id);
System.out.println("请输入添加的商品");
String name = sc.next();
m.setName(name);
System.out.println("请输入"+name+"的单价");
double jia = sc.nextDouble();
System.out.println("请输入购买"+name+"的数量");
int amount =sc.nextInt();
System.out.println();
System.out.println();
m.setPrice(jia);
m.setNumbers(amount);
al.put(id, m);
}
}
3,查看购物车内商品
public void cha() {
System.out.println("请输入要查看商品的编号");
Scanner sc=new Scanner(System.in);
Integer id = sc.nextInt();
if(al.containsKey(id)) {
System.out.println("编号\t名字\t价格\t数量");
System.out.println(al.get(id).getId()+"\t"+al.get(id).getName()+"\t"+al.get(id).getPrice()+"\t"+al.get(id).getNumbers());
}else {
System.out.println("该商品编号不存在,请重新输入");
this.cha();
}
System.out.println();
System.out.println();
}
4,删除商品
public void deleate(){
System.out.println("请输入要删除的商品的编号");
Scanner sc=new Scanner(System.in);
Integer id = sc.nextInt();
if(al.containsKey(id)) {
al.remove(id);
}else {
System.out.println("该商品编号不存在,请重新输入");
this.deleate();
}
System.out.println();
System.out.println();
}
5,查看所有商品以及结账和小票
public void print() {
double sum=0;
System.out.println("------欢迎光临XXXXXX超市-------");
System.out.println("-----------购物清单-----------");
for(Goods g:al.values()) {
System.out.println("编号\t名字\t价格\t数量");
System.out.println(g.getId()+"\t"+g.getName()+"\t"+g.getPrice()+"\t"+g.getNumbers());
sum += g.getPrice()*g.getNumbers();
}
System.out.println("----------------------------");
System.out.println(" 你一共需要支付:"+sum+"元");
}
public void View() {
System.out.println("-----------购物清单-----------");
for(Goods g:al.values()) {
System.out.println("编号\t名字\t价格\t数量");
System.out.println(g.getId()+"\t"+g.getName()+"\t"+g.getPrice()+"\t"+g.getNumbers());
}System.out.println();System.out.println();
}
6,测试调用
public static void main(String[] args) {
GouWu myg=new GouWu();
Scanner sc =new Scanner(System.in);
do {
System.out.println("----功能列表----");
System.out.println("(1)添加商品到购物车");
System.out.println("(2)查看商品属性");
System.out.println("(3)删除购物车商品");
System.out.println("(4)查看购物车所有商品");
System.out.println("(5)结账(打印小票)");
System.out.println();
System.out.println();
Integer it = sc.nextInt();
switch(it) {
case 1: myg.cun();
break;
case 2:myg.cha();
break;
case 3:myg.deleate();
break;
case 4:myg.View();
break;
case 5:
sc.close();
myg.print();
System.exit(0);
default:System.out.println("输入有误,请重新输入");
break;
}
}while(true);
}
}