JAVA购物管理系统

重点内容

• JAVA分支结构练习
• 注册表读写删

package Endless;

import java.util.ArrayList;
import java.util.Random;
/**
* @JAVA01.person1.java
* @author 当前用户：Endless作者 :Endless
* @version 创建时间：2017年7月26日 下午6:29:16
* //实现商品及会员信息管理(添加，删除，显示)
* //实现超市结算
*/
import java.util.Scanner;
import java.util.prefs.BackingStoreException;
import java.util.prefs.Preferences;

public class persion {
    static int s;
    static boolean huiyuan,xhuiyuan;
    static  String bke="百事可乐",ke="500ml可乐一瓶",m="5公斤面粉",ss="1个苏泊尔炒菜锅",o="欧莱雅爽肤水一瓶";
    static ArrayListarray=new ArrayList();
    static Preferences goodsnodes = Preferences.systemRoot().node("goods");  //创建节点
    static Preferences goodschildnode = goodsnodes.node( "goods");            //创建子节点    

    public static void main(String []args) {


           outline();
           System.out.println("\t欢迎使用购物管理系统");
           System.out.println("\t1.登陆系统\n\t2.退出程序\n ");
           outline();
           int n =scanint();  
           if(n == 1){  
                    login();         
            }else if( n== 2){  
               System.out.println("已退出");
               System.exit(0);
           }else {
               System.out.println("请重新选择：");
               main(null);
        }

  }
    public static void outline(){
          System.out.println("* * * * * * * * * * * * * * * * * * * * * * *\n");
    }

    public static int scanint(){
        int x = 0;
        try {
            Scanner scan =new Scanner(System.in);
            x = scan.nextInt();
        } catch (Exception e) {
             System.out.println("输入有误,请输入数字：");
        }
        return x;   
        }

    public static String scanStr(){
        String  x = null;
        try {

            Scanner scan =new Scanner(System.in);
            x = scan.next();
        } catch (Exception e) {
             System.out.println("输入有误,请输入字符串：");
        }
        return x;   
        }
    public static void login(){
         System.out.println(" * * * * * * * * * 登陆 * * * * * * * * * * * *\n请输入密码\n：");
           int n1 =scanint();
           if(n1==(123123)){
               System.out.println("登陆成功\n");
               showMain();
          }else{  
               System.out.println("密码错误");
               System.out.println("请重新输入密码\n：");
               login();
           } 
    }
    private static void showMain() {
        System.out.println("\n\n\t欢迎使用购物管理系统\n");  
        outline(); 
        System.out.println("\t\t 1. 会 员 信 息 管 理\n");  
        System.out.println("\t\t 2. 货 物 信 息 管 理\n"); 
        System.out.println("\t\t 3. 购 物 结 算\n");   
        System.out.println("\t\t 4. 注 销\n");  
        outline(); 
        System.out.print("请选择,输入数字:");  
        int n2 =scanint();
        switch (n2) {
        case 1:
            new user();
            break;
        case 2:
            goods();
            break;
        case 3:
            jiesuan();
            break;
        case 4:
            System.out.println("注销成功");
            main(null);
        default:
            System.out.println("没有您要的选项请重新输入");
            showMain();
            break;
        }
    }
    private static void goods() {
        //商品管理   ：添加商品： 编号 品名 价格
        // 删除：选择标号删除

        outline();
        System.out.println("\t\t商品信息管理\n");
        System.out.println("\t\t1,显示商品\n");
        System.out.println("\t\t2,添加物品\n");
        System.out.println("\t\t3,删除商品\n");
        System.out.println("\t\t4,返回上级\n");
        outline();
        int n = scanint();
        if (n==1){
            showgoods();
        }else if(n==2){
            addgoods();
        }else if(n ==3){
            delgoods();
        }else if(n==4) {
            showMain();
        }else {
            goods();
        }
    }


        private static void delgoods()  {
                 System.out.println("请选择要删除商品的ID：\n按0返回上级");
                 try {
                 Scanner scan =new Scanner(System.in);
                    int x = scan.nextInt();
                    boolean remove=false;
                        for (int i=0;iif(x==Integer.parseInt(array.get(i))){
                                remove=true;
                            }
                        }
                    if (remove){
                            goodschildnode.remove(Integer.toString(x));
                            System.out.println("删除成功");
                            goods();
                    }else if (x==0) {
                         goods();
                    }else {
                        System.out.println("没有此商品！");      
                         delgoods();
                    }
                    new user();
                 } catch (Exception e) {
                    System.out.println("请输入数字");
                         delgoods();
                    }
        }







        private static void  showgoods() {
            try {
                 int leng =goodschildnode.keys().length;
                    syncread();
                    if(leng==0){
                        System.out.println("没有商品");
                    }else{
                        try {
                            System.out.println("当前有"+goodschildnode.keys().length+"种商品");
                            for(int i = 0;i<=goodschildnode.keys().length;i++){
                                String shows =goodschildnode.get(array.get(i), "");
                                 System.out.println(shows);
                                 System.out.println("──────────────────────────────────────────────"); 
                               }
                            System.out.println("00000000");
                            } catch (Exception e) {
                            }
                        }

                } catch (BackingStoreException e) {

                }
            System.out.println("111111111");
                 goods();       
        }

        private static void syncread() {
            try {
         String[] arr= goodschildnode.keys();
         goodschildnode.sync();
         array.clear();
         for(int i=0;icatch (Exception e) {
            }
        }

        private static int check(int x) {
             Random n=new Random();
             syncread();
             for(int i=0;iif(x==Integer.parseInt(array.get(i))){
                     check(n.nextInt(999)+1);
                 }  
             } 
            return x;

        }
        private static void addgoods(){
             outline();
             System.out.println("\t\t请输入商品信息");
             System.out.println("\t\t品名,价格(元),单位");
             System.out.println("\t\t回车换行区分");
             outline();
             syncread();
             String name =scanStr();
             String nuit =scanStr();
             int  price = scanint();     
             Random n=new Random();
             String id ;
                 id=Integer.toString(check(n.nextInt(999)+1));
                 try{
                 goodschildnode.put(id, "ID:"+id+"  品名："+name+"   价格："+price+"   单位："+nuit);
                 syncread();
                 System.out.println("第"+(goodschildnode.keys().length)+"种商品添加成功");
                 System.out.println("当前商品"+goodschildnode.keys().length+"种\n"+array+"\n"+array.size());
                 goods();       
             } catch (Exception e) {
                 goods(); 
            }
    }






    static void jiesuan(){
        try{
            System.out.println("是否会员？是选1  否选0");
            int x= scanint();
            if (x==1){
                 huiyuan = true;
                 Scanner sc =new Scanner(System.in);    
                 System.out.println("请输入您的会员号：");
                    int hui = sc.nextInt()/100%10;
                    if(hui==9){
                        System.out.println("恭喜你属于幸运会员,可以享受全场八折优惠");
                        xhuiyuan = true;
                    }else{
                        xhuiyuan = false;
                    }
            }else if (x==0) {
                 huiyuan = false;
            }
            System.out.println("请输入消费金额:");
            Scanner scan =new Scanner(System.in);   
            if(scan.hasNext()){
                s=scan.nextInt();
                outline();
                System.out.println("是否参加优惠换购活动：" );
                System.out.println("1:满50元，加2元换购"+bke );
                System.out.println("2:满100元，加3元换购" +ke);
                System.out.println("3:满100元，加10元换购" +m );
                System.out.println("4:满200元，加10元换购" +ss );
                System.out.println("5:满200元，加20元换购 " +o );
                System.out.println("0：不换购\n请选择：\n" );
                outline();
                os();
            }   
        } catch (Exception e) {
            System.out.println("请输入数字");
            jiesuan();

    }
    }   
    static void out(String n , double s){
        if(!(n==null)){
            System.out.println("成功换购"+n);
        }
        System.out.println("本次消费总金额："+s+"元");
        if (huiyuan && xhuiyuan){
            System.out.println("尊敬的幸运会员，本次消费享受8折优惠");
             double x =s*0.8;
            System.out.println("折扣为您节省："+(s-x)+"元");
        }else if (huiyuan) {
            System.out.println("尊敬的会员，本次消费享受9折优惠");
             double x =s*0.9;
            System.out.println("折扣为您节省："+(s-x)+"元");
        }
        System.out.println("实际消费总金额："+s+"元");
        showMain();
    }
    static void os(){
          switch (scanint()) {
            case 0:
                out(null,s);
            case 1:
                if(s>=52){
                    out(bke,s+2);
                }else{
                    Err();
                }
            case 2:
                if(s>=103){
                    out(ke,s+3);
                }else{
                    Err();
                }
                break;
            case 3:
                if(s>=110){
                    out(m,s+10);
                }else{
                    Err();
                }
                break;
            case 4:
                if(s>=210){
                    out(ss,s+10);
                }else{
                    Err();
                }
                break;
            case 5:
                if(s>=220){
                    out(o,s+20);
                }else{
                    Err();
                }
                break;
            default:
                System.out.println("请重新选择");
                os();
            }
    }
     static void Err(){

         System.out.println("金额不足\n");
         main(null);
    } 
     static class user{
         static ArrayListarray=new ArrayList<>();
         static Preferences nodes = Preferences.systemRoot().node("user");  //创建节点
         static Preferences childnode = nodes.node( "user");            //创建子节点    


         public user() {
             outline();
             System.out.println("\t\t1,添加用户");
             System.out.println("\t\t2,删除用户");
             System.out.println("\t\t3,显示用户");
             System.out.println("\t\t4,返回上级");
             outline();
             try {
                 int x=scanint();
                 switch (x) {
                    case 1:
                        add();
                        break;
                    case 2:
                        deluser();
                        break;
                    case 3:
                        show();
                        break;
                    case 4:
                        showMain();
                        break;
                    default:
                        System.out.println("没有您要的选项！请重新选择");
                         new user();
                        break;
                    }
            } catch (Exception e) {
                new user();
            } 
        }



        private void deluser() throws BackingStoreException  {
                    System.out.println("请选择要删除用户的ID：\n按0返回上级");
                    try {
                    Scanner scan =new Scanner(System.in);
                    int x = scan.nextInt();
                    boolean remove=false;
                        for (int i=0;iif(x==Integer.parseInt(array.get(i))){
                                remove=true;
                            }
                        }
                    if (remove){
                            childnode.remove(Integer.toString(x));
                            System.out.println("删除成功");
                    }else if (x==0) {
                        new user();
                    }else {
                        System.out.println("没有此用户！");      
                         deluser();
                    }
                    new user();
                    } catch (Exception e) {
                        System.out.println("请输入数字");
                         deluser();
                    }
        }







        private static void  show() {
            try {
                 int leng =childnode.keys().length;
                    syncread();
                    if(leng==0){
                        System.out.println("没有用户");
                    }else{
                        System.out.println("当前有"+childnode.keys().length+"位用户");
                        for(int i = 0;i<=childnode.keys().length;i++){
                            String shows =childnode.get(childnode.keys()[i], "");
                             System.out.println(shows);
                             System.out.println("──────────────────────────────────────────────"); 
                        }
                    }
                } catch (BackingStoreException e) {
                }
                new user();         
        }

        private static void syncread() {
            try {
            String[] arr= childnode.keys();
            childnode.sync();
            array.clear();
            for(int i=0;icatch (Exception e) {
            }
        }


        private static void add(){
            Preferences nodes = Preferences.systemRoot().node("user");  //创建节点
            Preferences childnode = nodes.node( "user");            //创建子节点    
             outline();
             System.out.println("\t\t请输入用户信息");
             System.out.println("\t\t姓名,6位卡号,年龄,电话");
             System.out.println("\t\t回车换行区分");
             outline();
             syncread();
             String name =scanStr();
             int  card = scanint();
             int age =scanint();
             String tel =scanStr();
             Random n=new Random();

             String id ;
                 id = Integer.toString(n.nextInt(999)+1);
                 try{
                 childnode.put(id, "ID:"+id+"  姓名："+name+"   卡号："+card+"   年龄："+age+"   电话："+tel);
                 syncread();
                 System.out.println("第"+(childnode.keys().length)+"位会员添加成功");
                 System.out.println("当前用户"+childnode.keys().length+"位\n"+array+"\n"+array.size());
                 new user();        
             } catch (Exception e) {
                 new user(); 
            }
       }
   }    
}