Java实现一个疫情人数管理系统

主要是对省份人数进行增加减少重查重增加，管理员注册登录。
借鉴了一些资料写的比较简陋，功能不多，加一个主函数就能运行。

package yiqing;

public class Province {
	
	private String ProvinceName;
@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((ProvinceName == null) ? 0 : ProvinceName.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Province other = (Province) obj;
		if (ProvinceName == null) {
			if (other.ProvinceName != null)
				return false;
		} else if (!ProvinceName.equals(other.ProvinceName))
			return false;
		return true;
	}

public String getProvinceName() {
		return ProvinceName;
	}

	public void setProvinceName(String provinceName) {
		ProvinceName = provinceName;
	}



public Province(String provinceName) {
	
	ProvinceName = provinceName;
}
public Province() {}

}

package yiqing;

public class MenuUtils {
public static void Welcome() {
	System.out.println("====请登录疫情控制终端====");
	System.out.println("1.登录");
	System.out.println("2.注册");
	System.out.println("3.退出");
}
public static void control() {
	System.out.println("====欢迎来到疫情人数控制终端====");
	System.out.println("1.查看全国疫情人数");
	System.out.println("2.减少指定地区疫情人数");
	System.out.println("3.指定痊愈病人复发，重新增加");
	System.out.println("4.查看指定省市已经痊愈的人数");
	System.out.println("5.增加指定地区疫情人数");
	System.out.println("6.返回上一级");
}
}

package yiqing;

import java.awt.print.Book;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;
import java.util.Set;

public class ProvinceManager {
private Map<Province,Integer> provinces = new HashMap<>();
	{
		provinces.put(new Province("北京"), 0);
		provinces.put(new Province("天津"), 0);
		provinces.put(new Province("河北"), 0);
		provinces.put(new Province("山西"), 0);
		provinces.put(new Province("内蒙古"), 0);
		provinces.put(new Province("宁夏"), 0);
		provinces.put(new Province("青海"), 0);
		provinces.put(new Province("陕西"), 0);
		provinces.put(new Province("甘肃"), 0);
		provinces.put(new Province("*"), 0);
		provinces.put(new Province("辽宁"), 0);
		provinces.put(new Province("吉林"), 0);
		provinces.put(new Province("黑龙江"), 0);
		provinces.put(new Province("山东"), 0);
		provinces.put(new Province("江苏"), 0);
		provinces.put(new Province("上海"), 0);
		provinces.put(new Province("浙江"), 0);
		provinces.put(new Province("安徽"), 0);
		provinces.put(new Province("福建"), 0);
		provinces.put(new Province("江西"), 0);
		provinces.put(new Province("河南"), 0);
		provinces.put(new Province("湖南"), 0);
		provinces.put(new Province("湖北"), 0);
		provinces.put(new Province("四川"), 0);
		provinces.put(new Province("贵州"), 0);
		provinces.put(new Province("云南"), 0);
		provinces.put(new Province("重庆"), 0);
		provinces.put(new Province("*"), 0);
		provinces.put(new Province("广东"), 0);
		provinces.put(new Province("广西"), 0);
		provinces.put(new Province("海南"), 0);
		provinces.put(new Province("香港"), 0);
		provinces.put(new Province("澳门"), 0);
		provinces.put(new Province("*"), 0);
	
	}
	private ProvinceManager() {}
	private static ProvinceManager instance = new ProvinceManager();
	public static ProvinceManager getInstance() {
		if(instance == null) {
			instance = new ProvinceManager();
		}
		return instance;
	}
	
	Scanner sc = new Scanner(System.in);
	public void start(User u) {
		while(true) {
			MenuUtils.control();
			System.out.println("请选择");
			int choose = sc.nextInt();
			switch(choose) {
			case 1:
			{
				showProvinces();
				break;
			}
			case 2:
			{
				HashMap<Province,Integer> map = ReduceProvince();
				if(map!=null) {
					u.saveProvince(map);
				}else {
					System.out.println("减少人数失败");
				}
				break;
			}
			case 3:
			{
				Map<Province,Integer> uMap = u.returnProvince();
				if(uMap!=null) {
					returnProvinceManager(uMap);
					
				}else {
					System.out.println("复发人数添加失败");
				}
				break;
			}
			case 4:
			{
				u.showProvince();
				break;
			}
			case 5:
			{
				HashMap<Province,Integer> map = addProvinces();

				System.out.println("请输入要增加人数的省份名字和增加的数量");
				if(map!=null) {
					u.saveProvince(map);
				}else {
					System.out.println("增加人数失败");
				}
				break;
			}
			case 6:
			{
				return;
			}
			}
		}
	}
	private void showProvinces() {
		Set<Entry<Province,Integer>> entrySet = provinces.entrySet();
		System.out.println("省份\t数量");
		for(Entry<Province,Integer> entry:entrySet) {
			System.out.println(entry.getKey().getProvinceName()+"\t"+entry.getValue());
		}
	}
	private HashMap<Province,Integer> ReduceProvince(){
		while(true) {
			System.out.println("请输入省份名");
			String pname = sc.next();
			Province province = new Province(pname);
			boolean containsKey = provinces.containsKey(province);
			if(!containsKey) {
				System.out.println("没这个省");
				continue;
			}
			System.out.println("请输入你要减少的数量");
			int num = sc.nextInt();
			Integer count = provinces.get(province);
			if(num>count) {
				System.out.println("没那么多人");
				return null;
			}
			provinces.put(province, count-num);
			
			HashMap<Province,Integer> map = new HashMap<>();
			map.put(province, num);
			return map;
		}
	}
	private void returnProvinceManager(Map<Province,Integer> uMap) {
		Set<Entry<Province,Integer>> entrySet = uMap.entrySet();
		for(Entry<Province,Integer> entry:entrySet) {
			Integer count = entry.getValue();
			Province province = entry.getKey();
			Integer num = provinces.get(province);
			provinces.put(province, num==null?count:count+num);
		}
		System.out.println("复发病人添加成功");
	}
	private HashMap<Province,Integer> addProvinces(){
		System.out.println("请输入省份名字");
		String pname = sc.next();
		Province province = new Province(pname);
		boolean ContainsKey = provinces.containsKey(province);
		if(!ContainsKey) {
			System.out.println("没这个省");
		}
		System.out.println("输入你要添加的人数");
		int num = sc.nextInt();
		Integer count = provinces.get(province);
		provinces.put(province, num+count);
		return (HashMap<Province, Integer>) provinces;
	}
}

package yiqing;

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;
import java.util.Set;

public class User {
@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((UserName == null) ? 0 : UserName.hashCode());
		result = prime * result + ((UserPassword == null) ? 0 : UserPassword.hashCode());
		return result;
	}
	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		User other = (User) obj;
		if (UserName == null) {
			if (other.UserName != null)
				return false;
		} else if (!UserName.equals(other.UserName))
			return false;
		if (UserPassword == null) {
			if (other.UserPassword != null)
				return false;
		} else if (!UserPassword.equals(other.UserPassword))
			return false;
		return true;
	}
public String getUserName() {
		return UserName;
	}
	public void setUserName(String userName) {
		UserName = userName;
	}
	public String getUserPassword() {
		return UserPassword;
	}
	public void setUserPassword(String userPassword) {
		UserPassword = userPassword;
	}
private String UserName;
private String UserPassword;
public User(String userName, String userPassword) {
	super();
	UserName = userName;
	UserPassword = userPassword;
}
public User() {}

/*
 * 存储疫情人数的表
 */
private HashMap<Province,Integer> hashmap = new HashMap<>();

public void saveProvince(HashMap<Province,Integer> map) {
	Set<Entry<Province,Integer>> entrySet = map.entrySet();
	for(Entry<Province,Integer> entry:entrySet) {
		Province province = entry.getKey();
		Integer count = entry.getValue();
		Integer num = hashmap.get(province);
		
		hashmap.put(province, num==null ? count:num+count);
	}
	System.out.println("成功！");
}

public Map<Province,Integer> returnProvince(){
	while(true) {
		Scanner sc = new Scanner(System.in);
		System.out.println("请输入要增加人数的省份的名字");
		String pname = sc.next();
		Province province = new Province(pname);
		boolean containsKey = hashmap.containsKey(province);
		if(!containsKey) {
			System.out.println("没有这个省份 请重新输入");
			continue;
		}
		System.out.println("请输入复发人的数量");
		int num = sc.nextInt();
		Integer count = hashmap.get(province);
		if(num>count) {
			System.out.println("没有那么多人");
			return null;
		}
		hashmap.put(province, count-num);
		Map<Province,Integer> map = new HashMap<>();
		map.put(province, num);
		return map;
	}
	
	
	
}
public void showProvince() {
	Set<Entry<Province,Integer>> entryset = hashmap.entrySet();
	System.out.println("省份\t数量");
	for(Entry<Province,Integer> entry:entryset) {
		System.out.println(entry.getKey().getProvinceName()+"\t"+entry.getValue());
	}
}
}

package yiqing;

import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class UserManager {

		private Set<User> users = new HashSet<>();
		public UserManager() {
			users.add(new User("admin","root"));
		}
	
		/*
		 * 开始菜单
		 */
		
		public void start() {
			while(true) {
				MenuUtils.Welcome();
				System.out.println("请输入您的选择");
				Scanner sc = new Scanner(System.in);
				int choose = sc.nextInt();
				switch(choose) {
				case 1:
				{
					User luser = login();
					User lUser = new User();
					if(lUser != null) {
						ProvinceManager.getInstance().start(lUser);
					}else {
						System.out.println("登陆失败");
					}
					break;
				}
				case 2:
				{
					boolean reg = register();
					System.out.println(reg?"注册成功":"注册失败");
					break;
				}
				case 3:
				{
					System.out.println("退出程序");
					System.exit(0);
					break;
				}
				default:
				{
					break;
				}
			}
		}
}
		
		Scanner sc = new Scanner(System.in);
		private User login() {
			System.out.println("请输入您的用户名，exsit退出");
			String username = sc.next();
			if(username.equals("exsit")) {
				start();
			}
			boolean checkusername = checkUsername(username);
			if(!checkusername) {
				System.out.println("用户名不存在，请重新输入");
				return login();
			}
			System.out.println("请输入您的密码");
			String password = sc.next();
			for(User user :users) {
				if(user.getUserName().equals(username)&&user.getUserPassword().equals(password)) {
					return user;
				}else {
					System.out.println("密码输入错误，请重新输入");
					return login();
				}
			}
			return null;
		}
		private boolean checkUsername(String username) {
			for(User user:users) {
				if(user.getUserName().equals(username)) {
					return true;
				}
			}
			return false;
		}
		private boolean register() {
			while(true) {
				System.out.println("请输入您想要注册的用户名");
				String username = sc.next();
				if(username.equals("exsit")) {
					return false;
				}
				boolean isCheck = checkUsername(username);
				if(isCheck) {
					System.out.println("用户名已经存在，请重新输入");
					continue;
				}
				System.out.println("请输入您想要注册的密码");
				String password = sc.next();
				return users.add(new User(username,password));
			}
		}
}

本文地址：https://blog.csdn.net/weixin_44976835/article/details/109587897