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！
");
        System.out.println("请您先登陆！
");
        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！
"+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+" 	");
                System.out.print("stock:"+com[i].stock+" 	");
                System.out.print("price:"+com[i].price+" 	");
                System.out.print("id:"+com[i].id+"	");
                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+" 	");
            System.out.print("stock:"+com[0].stock+" 	");
            System.out.print("price:"+com[0].price+" 	");
            System.out.print("id:"+com[0].id+"	");
            System.out.println();
            System.out.println();
            System.out.print("name:"+com[3].name+" 	");
            System.out.print("stock:"+com[3].stock+" 	");
            System.out.print("price:"+com[3].price+" 	");
            System.out.print("id:"+com[3].id+"	");
            System.out.println();
            System.out.println();
            System.out.println('u2605'+"男士专区"+'u2605');
            System.out.print("name:"+com[1].name+" 	");
            System.out.print("stock:"+com[1].stock+" 	");
            System.out.print("price:"+com[1].price+" 	");
            System.out.print("id:"+com[1].id+"	");
            System.out.println();
            System.out.println();
            System.out.print("name:"+com[5].name+" 	");
            System.out.print("stock:"+com[5].stock+" 	");
            System.out.print("price:"+com[5].price+" 	");
            System.out.print("id:"+com[5].id+"	");
            System.out.println();
            System.out.println();
            System.out.println('u2605'+"户外运动"+'u2605');
            System.out.print("name:"+com[2].name+" 	");
            System.out.print("stock:"+com[2].stock+" 	");
            System.out.print("price:"+com[2].price+" 	");
            System.out.print("id:"+com[2].id+"	");
            System.out.println();
            System.out.println();
            System.out.print("name:"+com[4].name+" 	");
            System.out.print("stock:"+com[4].stock+" 	");
            System.out.print("price:"+com[4].price+" 	");
            System.out.print("id:"+com[4].id+"	");
            System.out.println();
            System.out.println();
        }
        else{
        System.out.println("输入错误！
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();
        
    }
}