使用Map集合编写超级会员管理系统：

package com.mapmembers;public class ValueMember {	private String name;//会员性名	private String passWord;//会员卡号密码	private int score;//会员积分	private String cardDate;//开卡日期		public ValueMember() {}		public ValueMember(String name, String passWord, int score, String cardDate) {		super();		this.name = name;		this.passWord = passWord;		this.score = score;		this.cardDate = cardDate;	}	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}	public String getPassWord() {		return passWord;	}	public void setPassWord(String passWord) {		this.passWord = passWord;	}	public int getScore() {		return score;	}	public void setScore(int score) {		this.score = score;	}	public String getCardDate() {		return cardDate;	}	public void setCardDate(String cardDate) {		this.cardDate = cardDate;	}}

 

package com.mapmembers;import java.text.SimpleDateFormat;import java.util.Collection;import java.util.Date;import java.util.HashMap;import java.util.Map;import java.util.Random;import java.util.Scanner;import java.util.Set;import com.members.Members;public class Member {	Scanner cxj = new Scanner(System.in);	Map
     
       map = new HashMap
      
       ();	int cardId;	public String verCode() {		Random rand = new Random();		int b = 0;//判断是否有数字出现		int c = 0;//判断是否有大写字母出现		int d = 0;//判断是否有小写字母出现		String k;//记录验证码		char code;		do {			int a = 0;			//初始化验证码字符串			k = "";			do {				int num = rand.nextInt(123);				if(num>=48&&num<=57) {					code = (char)num;					k += code;					b++;					a++;				}else if(num>=65&&num<=90) {					code = (char)num;					k += code;					c++;					a++;				}else if(num>=97&&num<=122) {					code = (char)num;					k += code;					d++;					a++;				}			}while(a<6);			//若随机后没有包含大小写与数字，则继续随机		}while(!(b>=1&&c>=1&&d>=1));		return k;	}		public void loginMember() {		Set
       
         setKm = map.keySet();		boolean flag = true;		System.out.print("请输入卡号：");		do {			int id = cxj.nextInt();			System.out.print("请输入密码：");			String pwd = cxj.next();			String ver = verCode();			System.out.println(ver);			System.out.print("请输入验证码：");			String verUser = cxj.next();			for(Integer km : setKm) {				if((km==id)&&(map.get(km).getPassWord().equals(pwd))&&(ver.equalsIgnoreCase(verUser))) {					System.out.println("登录成功！");					memberUi();					flag = false;					break;				}else {					System.out.print("该用户名不存在，请重新登录，卡号：");					flag = true;				}			}		}while(flag);	}	public int cardNumber() {		Set
        
          setKm = map.keySet();		Random rand = new Random();		int cardId = rand.nextInt(9999999);		for(Integer km : setKm) {			if(km==cardId) {				cardId = rand.nextInt(9999999);			}		}		return cardId;	}	public void openCard() {		ValueMember vm = new ValueMember();		System.out.print("请输入用户名：");		vm.setName(cxj.next());		cardId = cardNumber();		System.out.print("请设置密码：");		String pwd;		boolean bl = true;		do {			pwd = cxj.next();			if(pwd.length()<6) {				System.out.println("密码长度小于6，请重新输入：");				bl = false;			}else {				vm.setPassWord(pwd);				bl = true;			}		}while(!bl);		Date d = new Date();		SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");		vm.setCardDate(sd.format(d));		vm.setScore(100);		System.out.println("恭喜您开卡成功，首次开卡赠送100积分！");		System.out.println("您的用户名是："+vm.getName());		System.out.println("您的卡号是："+cardId);		System.out.println("您的密码是："+vm.getPassWord());		System.out.println("您当前积分是："+vm.getScore());		System.out.println("开卡时间："+vm.getCardDate());		map.put(cardId, vm);	}	public void login() {		do {			System.out.println("*************");			System.out.println("1、开卡");			System.out.println("2、登录");			System.out.println("3、退出系统");			System.out.println("*************");			System.out.print("请选择：");			int choose = cxj.nextInt();			switch(choose) {			case 1:				openCard();				continue;			case 2:				loginMember();				break;			case 3:				System.out.println("感谢您的使用！");				break;			}			break;		}while(true);	}	public void queryScore(){		System.out.println("您当前积分是："+map.get(cardId).getScore()+"分！");	}	public void addScore() {		System.out.println("请输入您要消费的金额(1元人民币1积分)：");		int money = cxj.nextInt();		System.out.println("您累积"+money+"积分");		map.get(cardId).setScore(map.get(cardId).getScore()+money);		System.out.println("您当前积分有："+map.get(cardId).getScore()+"分");	}	public void changeScore() {		System.out.println("请输入您要兑换的积分数(100积分兑换1元人民币)：");		int score = cxj.nextInt();		System.out.println("您兑换了"+score/100+"元");		map.get(cardId).setScore(map.get(cardId).getScore()-score);		System.out.println("您当前剩余积分："+map.get(cardId).getScore());		}	public void changePwd() {		boolean flagone = true;		boolean flagtwo = true;		System.out.print("请输入旧密码：");		String oldPwd;		do {			oldPwd = cxj.next();			System.out.print("请输入新密码：");			do {				if(map.get(cardId).getPassWord().equals(oldPwd)) {					String newPwd = cxj.next();					String newPwd1;					if(oldPwd.equals(newPwd)) {						System.out.print("旧密码与新密码相同，请重新输入：");						flagone = true;						flagtwo = true;					}else {						System.out.print("请再次输入密码：");						newPwd1 = cxj.next();						if(newPwd1.equals(newPwd)) {							map.get(cardId).setPassWord(newPwd1);							flagone = false;							flagtwo = false;						}					}				}else {					System.out.print("旧密码输入有误，请重新输入：");					flagone = false;					flagtwo = true;					break;				}			}while(flagone);		}while(flagtwo);	}	public void memberUi() {		do {			System.out.println("*********************");			System.out.println("1、积分查询");			System.out.println("2、积分累积");			System.out.println("3、积分兑换");			System.out.println("4、修改密码");			System.out.println("5、返回登录界面");			System.out.println("*********************");			System.out.print("请选择您要的功能：");			int choose = cxj.nextInt();			switch(choose) {			case 1:				queryScore();				continue;			case 2:				addScore();				continue;			case 3:				changeScore();				continue;			case 4:				changePwd();				login();				break;			case 5:				login();				break;			}			break;		}while(true);	}}
        
       
      
     

　　

package com.mapmembers;public class MemTest {	public static void main(String[] args) {		Member mb = new Member();		mb.login();	}}

　　结果示例：

　　1、开卡：

　　2、登录

　　3、积分查询：

　　4、积分累积：

　　5、积分兑换：

　　6、修改密码：