java小程序-----用if for写会员登陆和商品列表

一、父类

 public class Father{                            //父类

     protected static int stock1 = 10;            //库存

     protected static int stock2 = 12;

     protected static int stock3 = 15;

     protected static int stock4 = 21;

     protected static int stock5 = 9;

     protected static int stock6 = 15;

     protected static float p1 = 1200;                //商品价格

     protected static float p2 = 89;

     protected static float p3 = 688;

     protected static float p4 = 5900;

     protected static float p5 = 399;

     protected static float p6 = 2588;

     protected static int integral1=10;            //会员积分

     protected static int integral2=200;

     protected static int integral3=900;

     protected static int integral4=3000;

     protected static int id1 = 1;                //商品id

     protected static int id2 = 2;

     protected static int id3 = 3;

     protected static int id4 = 4;

     protected static int id5 = 5;

     protected static int id6 = 6;

     int vipName;            //会员编号

     String  name;            //商品名

     float price;            //商品价格

     int stock;                //商品库存

     int integral;            //会员积分

     int id;                    //商品id

     protected static float sumprice = 0;

     public Father(String name,float price,int stock,int id){    //有参构造(商品)

         this.name = name;

         this.price = price;

         this.stock = stock;

         this.id  = id;

     }

     public Father(int vipName,int integral){            //有参构造（会员）

         this.vipName = vipName;

         this.integral = integral;

     }

     public Father() {

         super();

     }

 }

二、会员登陆

import java.util.Scanner;

public class Welcome extends Father{

    Scanner land= new Scanner(System.in);

    Father vip0 = new Father(0,integral1);                            //创建对象（会员）

    Father vip1 = new Father(1,integral2);

    Father vip2 = new Father(2,integral3);

    Father vip3 = new Father(3,integral4);

    public void vip(Scanner land){

        System.out.println("您好   欢迎光临！\n");

        System.out.println("请您先登陆！\n");

        System.out.println("请输入会员编号：");

        vipName=land.nextInt();

        Father [] vip = new Father[4];                                        //创建对象数组（会员）

        vip[0]=vip0;

        vip[1]=vip1;

        vip[2]=vip2;

        vip[3]=vip3;

        //用户名正确

        if(vipName==1||vipName==2||vipName==3||vipName==4||vipName==5||vipName==6){

            System.out.println("请输入密码：");

            String pasW = land.next();

            //密码正确

            if(pasW.equals("123")){

                System.out.println("登陆成功！\n"+vipName+"号vip，欢迎您！");

                System.out.println("您的当前积分为:"+vip[vipName].integral);

            }

            //密码错误

            else{

                System.out.println("密码错误0.0，请重新输入！");

                this.vip(land);

            }

        }

        //用户名错误

        else{

            System.out.println("用户不存在0.0，请重新输入！");

            this.vip(land);

        }

    }

    public static void main(String[]args){

        Scanner land= new Scanner(System.in);

        Welcome landVip = new Welcome();

        landVip.vip(land);

    }

}

三、商品列表及购买

import java.util.Scanner;

public class CommodityList extends Welcome{

    Father com1 = new Father("格力空调                         ",p1,stock1,id1);                //创建对象（商品）

    Father com2 = new Father("蓝色圆领polo衫（男）",p2,stock2,id2);

    Father com3 = new Father("Nice平底运动鞋透气型",p3,stock3,id3);

    Father com4 = new Father("华硕笔记本FL5900  ",p4,stock4,id4);

    Father com5 = new Father("adidas黑白户外双肩背包",p5,stock5,id5);

    Father com6 = new Father("chanel男士香水",p6,stock6,id6);

    Father comAll = new Father();                                                //无参构造对象

    Scanner sort= new Scanner(System.in);

    public void allCom(){

        Object selected=sort.next();

        Father [] com = new Father[6];                        //商品对象数组

        com[0] = com1;                                        //创建对象（商品）

        com[1] = com2;

        com[2] = com3;

        com[3] = com4;

        com[4] = com5;

        com[5] = com6;

        if(selected.equals("all")|selected.equals("0")|selected.equals("所有")){    //所有商品列表

            for(int i=0;i<6;i++){                            //遍历打印数组

                System.out.print("name:"+com[i].name+" \t");

                System.out.print("stock:"+com[i].stock+" \t");

                System.out.print("price:"+com[i].price+" \t");

                System.out.print("id:"+com[i].id+"\t");

                System.out.println();

                System.out.println();

            }

        }

        else if(selected.equals("assort")|selected.equals("1")|selected.equals("分类")){//分类商品列表

            System.out.println('\u2605'+"数码电器"+'\u2605');

            System.out.print("name:"+com[0].name+" \t");

            System.out.print("stock:"+com[0].stock+" \t");

            System.out.print("price:"+com[0].price+" \t");

            System.out.print("id:"+com[0].id+"\t");

            System.out.println();

            System.out.println();

            System.out.print("name:"+com[3].name+" \t");

            System.out.print("stock:"+com[3].stock+" \t");

            System.out.print("price:"+com[3].price+" \t");

            System.out.print("id:"+com[3].id+"\t");

            System.out.println();

            System.out.println();

            System.out.println('\u2605'+"男士专区"+'\u2605');

            System.out.print("name:"+com[1].name+" \t");

            System.out.print("stock:"+com[1].stock+" \t");

            System.out.print("price:"+com[1].price+" \t");

            System.out.print("id:"+com[1].id+"\t");

            System.out.println();

            System.out.println();

            System.out.print("name:"+com[5].name+" \t");

            System.out.print("stock:"+com[5].stock+" \t");

            System.out.print("price:"+com[5].price+" \t");

            System.out.print("id:"+com[5].id+"\t");

            System.out.println();

            System.out.println();

            System.out.println('\u2605'+"户外运动"+'\u2605');

            System.out.print("name:"+com[2].name+" \t");

            System.out.print("stock:"+com[2].stock+" \t");

            System.out.print("price:"+com[2].price+" \t");

            System.out.print("id:"+com[2].id+"\t");

            System.out.println();

            System.out.println();

            System.out.print("name:"+com[4].name+" \t");

            System.out.print("stock:"+com[4].stock+" \t");

            System.out.print("price:"+com[4].price+" \t");

            System.out.print("id:"+com[4].id+"\t");

            System.out.println();

            System.out.println();

        }

        else{

        System.out.println("输入错误！\n请重新输入");

        this.allCom();

        }

    }

    public void shopping(){

        Father [] com = new Father[6];                        //商品对象数组

        com[0] = com1;                                        //创建对象（商品）

        com[1] = com2;

        com[2] = com3;

        com[3] = com4;

        com[4] = com5;

        com[5] = com6;

        //是否购买判断

        System.out.println("是否购买商品（yes/no/是/否）");

        String sure = sort.next();

        //购买

        if(sure.equals("yes")|sure.equals("是")){

            System.out.println("请输入您选中的商品id");

            int shopId = sort.nextInt();

            for(int i=0;shopId<=com.length;i++){

                comAll.sumprice +=com[shopId-1].price;        //商品总价格

                --com[shopId-1].stock;                        //库存-1

                System.out.println("继续添加？(yes/no)");

                String cont = sort.next();

                //继续

                if(cont.equals("yes")){

                    System.out.println("请输入您选中的商品id");

                    shopId = sort.nextInt();

                }

                //不继续

                else if(cont.equals("no")){

                    System.out.println("谢谢惠顾！您购买的商品总价格为:"+comAll.sumprice+"元！积分增加"+comAll.sumprice/100);

                    break;

                }

                //其他回答

                else{

                    System.out.println("不好意思，没听清！");

                    CommodityList Com = new CommodityList();                    //创建对象

                    Com.shopping();

                }

            }

        }

        //不购买

        else if(sure.equals("no")|sure.equals("否")){

            System.out.println("欢迎下次光临！");

        }

        //输入错误

        else{

            System.out.println("不好意思，没听清！请您再说一次0.0");

            CommodityList Com = new CommodityList();                    //创建对象

            Com.shopping();

        }

    }

    public static void main(String[]args){

        CommodityList Com = new CommodityList();                    //创建对象

        System.out.println("0  所有商品列表");                            //提示信息

        System.out.println("1  商品分类列表");

        System.out.println("请选择商品显示列表（0/1/all/assort/“所有”/“分类”）");//提示输入信息

        Com.allCom();

        Com.shopping();

    }

}