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();

    }
}