实体类1（商品）：
package mall.model;
public class goods {
private int shoppingID; // 商品编号
private String shoppingName;// 商品名
private int price; // 商品价格
public goods(int shoppingID, String shoppingName, int price) {
this.shoppingID = shoppingID;
this.shoppingName = shoppingName;
this.price = price;
}
public goods() {
super();
}
public int getShoppingID() {
return shoppingID;
}
public void setShoppingID(int shoppingID) {
this.shoppingID = shoppingID;
}
public String getShoppingName() {
return shoppingName;
}
public void setShoppingName(String shoppingName) {
this.shoppingName = shoppingName;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
}
实体类2（购物车）
package mall.model;
public class shoppingCart {
private int shoppingID; // 商品编号
private String shoppingName; // 商品名
private int price; // 商品价格
public shoppingCart() {
super();
}
public shoppingCart(int shoppingID, String shoppingName, int price) {
super();
this.shoppingID = shoppingID;
this.shoppingName = shoppingName;
this.price = price;
}
public int getShoppingID() {
return shoppingID;
}
public void setShoppingID(int shoppingID) {
this.shoppingID = shoppingID;
}
public String getShoppingName() {
return shoppingName;
}
public void setShoppingName(String shoppingName) {
this.shoppingName = shoppingName;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
}
实体类3（用户）
package mall.model;
/**
* @author shixi1809 用户类
*/
public class user {
private String userName; // 用户名
private String passWord; // 用户密码
private int type; // 用户类型，1位管理员，2为会员
public user(String userName, String passWord, int type) {
super();
this.userName = userName;
this.passWord = passWord;
this.type = type;
}
public user() {
super();
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassWord() {
return passWord;
}
public void setPassWord(String passWord) {
this.passWord = passWord;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public void show1() {
String ttt = null;
if (getType() == 1) {
ttt = "管理员";
} else if (getType() == 2) {
ttt = "会员";
}
System.out.println("用户名：" + getUserName() + ",密码：" + getPassWord()
+ ",用户类型：" + ttt);
}
}
测试类
package mall.controller;
import mall.function.service;
public class test {
public static void main(String[] args) {
System.out.println("请登录：");
service service = new service();
service.login();
}
}
功能实现
package mall.function;
import java.util.Scanner;
import mall.model.goods;
import mall.model.shoppingCart;
import mall.model.user;
public class service {
private static user user[] = new user[5];
private static goods good[] = new goods[5];
private static shoppingCart cart[] = new shoppingCart[5];
private static Integer num; // 登录的用户id
static {
for (int i = 0; i < good.length; i++) {
good[i] = new goods();
}
for (int i = 0; i < good.length; i++) {
cart[i] = new shoppingCart();
}
}
// 登录
@SuppressWarnings("resource")
public void login() {
// 给用户添加两个值，1为管理员，2位用户
user[0] = new user("admin", "admin", 1);
user[1] = new user("zhangsan", "zhangsan", 2);
Scanner scanner1 = new Scanner(System.in);
System.out.println("请输入用户名：");
String str1 = scanner1.next();
Scanner scanner2 = new Scanner(System.in);
System.out.println("请输入密码：");
String str2 = scanner2.next();
for (int i = 0; i < user.length; i++) {
if (user[i] != null) {
if (str1.equals(user[i].getUserName())
&& str2.equals(user[i].getPassWord())) {
if (user[i].getType() == 1) {
System.out.println("欢迎进入管理员界面！！");
while (true) {
System.out
.println("1.增加商品 2.删除商品 3.修改商品 4.商品显示 5.切换用户 0.退出系统");
Scanner scanner = new Scanner(System.in);
System.out.println("请选择功能：");
int sel = scanner.nextInt();
switch (sel) {
case 1:
add();
break;
case 2:
Scanner scan1 = new Scanner(System.in);
System.out.println("请输入要删除的商品编号：");
int sttr1 = scan1.nextInt();
System.out.println("是否确定要删除该商品？");
Scanner scan2 = new Scanner(System.in);
System.out
.println("请输入商品名（确认请输入'y'，取消请输入'n'）：");
String sttr2 = scan2.next();
if (sttr2.equals("y")) {
remove(sttr1);
} else if (sttr2.equals("n")) {
break;
} else {
System.out.println("输入有误！");
}
break;
case 3:
Scanner scan3 = new Scanner(System.in);
System.out.println("请输入商品编号：");
int strr = scan3.nextInt();
modify(strr);
break;
case 4:
show();
break;
case 5:
login();
break;
case 0:
System.exit(0);
break;
default:
System.out.println("输入有误！");
break;
}
}
} else {
System.out.println("欢迎进入用户界面！！");
num = i; // 登录的用户id
System.out.println(num);
while (true) {
System.out
.println("1.购买商品 2.商品搜索 3.商品展示 4.切换用户 0.退出系统");
Scanner scanner = new Scanner(System.in);
System.out.println("请选择功能：");
int sel = scanner.nextInt();
switch (sel) {
case 1:
Scanner scannerBuy = new Scanner(System.in);
System.out.println("请输入商品编号：");
int buyNo = scannerBuy.nextInt();
buy(buyNo);
break;
case 2:
Scanner sele = new Scanner(System.in);
System.out.println("请输入商品名：");
String selName = sele.next();
select(selName);
break;
case 3:
show();
break;
case 4:
login();
break;
case 0:
System.exit(0);
break;
default:
System.out.println("输入有误！");
break;
}
}
}
}
}
}
System.out.println("用户名与密码不符，请重新输入！");
}
// 加入购物车
@SuppressWarnings("resource")
public void cartAdd(int no) {
for (int i = 0; i < cart.length; i++) {
if (cart[i].getShoppingID() == 0) {
cart[i] = new shoppingCart(good[no].getShoppingID(),
good[no].getShoppingName(), good[no].getPrice());
System.out.println("购物车添加成功！");
System.out.println("请选择继续购物或进入购物车：1.继续购物 2.进入购物车 ");
Scanner scanner1 = new Scanner(System.in);
System.out.println("请选择：");
int str1 = scanner1.nextInt();
switch (str1) {
case 1:
show();
break;
case 2:
cartShow();
break;
default:
System.out.println("输入有误！！");
break;
}
break;
}
}
}
// 搜索商品
@SuppressWarnings("resource")
public void select(String name) {
for (int i = 0; i < good.length; i++) {
if (good[i].getShoppingName() != null
&& good[i].getShoppingName() != "") {
if (good[i].getShoppingName().indexOf(name) != -1) {
for (int j = 0; j < good.length; j++) {
if (good[i].getShoppingName().equals(
good[j].getShoppingName())) {
System.out.println("商品编号："
+ good[i].getShoppingID() + ",商品名："
+ good[i].getShoppingName() + ",价格："
+ good[i].getPrice());
System.out
.println("请选择购买商品或加入购物车：1.购买该商品 2.加入购物车 3.继续购物 4.进入购物车 ");
Scanner scanner1 = new Scanner(System.in);
System.out.println("请选择：");
int str1 = scanner1.nextInt();
switch (str1) {
case 1:
buy(j);
break;
case 2:
cartAdd(j);
break;
case 3:
show();
break;
case 4:
cartShow();
break;
default:
System.out.println("输入有误！！");
break;
}
}
}
}
}
}
}
// 购买商品
@SuppressWarnings("resource")
public void buy(int no) {
for (int i = 0; i < good.length; i++) {
if (no == good[i].getShoppingID()) {
System.out.println("商品编号：" + good[i].getShoppingID() + ",商品名："
+ good[i].getShoppingName() + ",价格："
+ good[i].getPrice());
System.out.println("是否确认购买(请回复y/n)？");
Scanner scan2 = new Scanner(System.in);
String sttr2 = scan2.next();
if (sttr2.equals("y")) {
System.out.println("商品购买成功！");
} else if (sttr2.equals("n")) {
System.out.println("商品购买失败！");
} else {
System.out.println("输入有误！");
}
}
}
}
// 添加商品
@SuppressWarnings("resource")
public void add() {
Scanner scanner1 = new Scanner(System.in);
System.out.println("请输入商品编号：");
int str1 = scanner1.nextInt();
Scanner scanner2 = new Scanner(System.in);
System.out.println("请输入商品名：");
String str2 = scanner2.next();
Scanner scanner3 = new Scanner(System.in);
System.out.println("请输入商品价格：");
int str3 = scanner3.nextInt();
for (int i = 0; i < good.length; i++) {
if (good[i].getShoppingID() != 0) {
if (good[i].getShoppingID() == str1) {
System.out.println("该商品已存在！！！");
return;
}
}
}
for (int i = 0; i < good.length; i++) {
if (good[i].getShoppingID() == 0) {
good[i] = new goods(str1, str2, str3);
System.out.println("商品添加成功！");
break;
}
}
}
// 移除商品
public void remove(int no) {
for (int i = 0; i < good.length; i++) {
if (good[i].getShoppingID() != 0) {
if (no == good[i].getShoppingID()) {
good[i] = new goods();
System.out.println("商品已删除！");
} else {
System.out.println("不存在该商品！");
}
}
}
}
// 商品修改
@SuppressWarnings("resource")
public void modify(int no) {
for (int i = 0; i < good.length; i++) {
if (good[i].getShoppingID() != 0) {
if (no == good[i].getShoppingID()) {
Scanner scanner2 = new Scanner(System.in);
System.out.println("请输入商品名：");
String str2 = scanner2.next();
Scanner scanner3 = new Scanner(System.in);
System.out.println("请输入商品价格：");
int str3 = scanner3.nextInt();
good[i] = new goods(no, str2, str3);
System.out.println("商品已修改。。。");
return;
}
}
}
System.out.println("商品未找到。。。");
}
// 显示商品
public void show() {
for (int i = 0; i < good.length; i++) {
if (good[i].getShoppingID() != 0) {
System.out.println("商品编号：" + good[i].getShoppingID() + ",商品名："
+ good[i].getShoppingName() + ",价格："
+ good[i].getPrice());
}
}
}
// 进入购物车
public void cartShow() {
System.out.println(user[num].getUserName() + "的购物车：");
for (int i = 0; i < cart.length; i++) {
if (cart[i].getShoppingID() != 0) {
System.out.println("商品编号：" + cart[i].getShoppingID() + ",商品名："
+ cart[i].getShoppingName() + ",价格："
+ cart[i].getPrice());
}
}
}
}