Java控制台购物系统

package com.sec.shop;
import java.util.Scanner;
public class SystemMenu {
	public void showMainMenu() {
		//显示系统主菜单
		System.out.println("\n* * * * * * * * * * * * * * * * * * * * * * * * * * * * *");
		System.out.println("*\t\t\t\t\t\t\t\t   *");
		System.out.println("*              欢迎使用迷你青春购物系统\t\t   *");
		System.out.println("*\t\t\t\t\t\t\t\t   *");
		System.out.println("* * * * * * * * * * * * * * * * * * * * * * * * * * * * *\n");
		System.out.println("1.客户信息管理\n");
		System.out.println("2.商品信息管理\n");
		System.out.println("3.购物信息管理\n");
		System.out.println("4.退出系统\n");
		boolean flag;
		do{
			System.out.println("\n请选择功能(1-4)：");
			Scanner sc = new Scanner(System.in);
			int fun = sc.nextInt();
			
			flag = false;
			switch(fun){
				case 1:
					showCustomerMenu();//显示客户管理菜单
					break;
				case 2:
				    showProductMenu();//显示商品管理菜单
					break;
				case 3:
					buyProductMenu();//显示购物管理菜单
					break;
				case 4:
					System.out.println("您已安全退出!欢迎下次使用本系统....");
					System.exit(0);
					break;
				default:
					System.out.println("请选择相应的功能，在1-4之间选择。");
					flag = true;
			}
		}while(flag);
	}

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资源文件列表

Shopsystem/.classpath , 356
Shopsystem/.project , 386
Shopsystem/.settings/org.eclipse.jdt.core.prefs , 598
Shopsystem/bin/com/shop/dao/CustomerDAO.class , 7892
Shopsystem/bin/com/shop/dao/ProductDAO.class , 5237
Shopsystem/bin/com/shop/db/ConnDB.class , 1435
Shopsystem/bin/com/shop/Manager/BuyManager.class , 9317
Shopsystem/bin/com/shop/Manager/CustomerManager.class , 8977
Shopsystem/bin/com/shop/Manager/ProductManager.class , 7780
Shopsystem/bin/com/shop/ui/ShopTest.class , 511
Shopsystem/bin/com/shop/ui/SystemMenu.class , 3965
Shopsystem/bin/sqljdbc4.jar , 422699
Shopsystem/src/com/shop/dao/CustomerDAO.java , 8468
Shopsystem/src/com/shop/dao/ProductDAO.java , 4976
Shopsystem/src/com/shop/db/ConnDB.java , 975
Shopsystem/src/com/shop/Manager/BuyManager.java , 12716
Shopsystem/src/com/shop/Manager/CustomerManager.java , 9373
Shopsystem/src/com/shop/Manager/ProductManager.java , 9078
Shopsystem/src/com/shop/ui/ShopTest.java , 160
Shopsystem/src/com/shop/ui/SystemMenu.java , 4482
Shopsystem/src/sqljdbc4.jar , 422699
shopDB.sql , 3046