Java用户账号密码创建登录

完成这个题目需要创建两个class文件

 一个存放用户类一个测试类

用户类

package com.bili.demo2;

public class User {
	private String userName;
	private String userPassWord;
	private boolean state;
	

	public User() {
		super();
	}
	public User(String userName, String userPassWord) {
		super();
		this.userName = userName;
		this.userPassWord = userPassWord;
		this.state = state;
	}
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public String getUserPassWord() {
		return userPassWord;
	}
	public void setUserPassWord(String userPassWord) {
		this.userPassWord = userPassWord;
	}
	public boolean isState() {
		return state;
	}
	public void setState(boolean state) {
		this.state = state;
	}
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((userName == null) ? 0 : userName.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;
		return true;
	}
	
	
	

	
}

测试类

package com.bili.demo2;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Scanner;


public class Demo2 {
	static Scanner sc = new Scanner(System.in);
	static HashSet set = new HashSet<>();
	public static void main(String[] args) {
		while(true) {
			showMenu("****欢迎使用用户注册系统****","1.注册","2.登录","3.退出","请选择您的操作：");
			String i = sc.next();
			switch(i) {
				case "1":
					UserRegister();
					break;
				case "2":
					userLog();
					break;
				case "3":
					System.out.println("正在退出系统，请稍后》》》");
					System.out.println("功成退出");
					System.exit(0);
					break;
				default:
					System.out.println("暂时没有您选择的功能呢,请重新输入：");
					break;
			}
		}
	}
	
	
	private static void showMenu(String...menus) {
		for(String menu :menus) {
			System.out.println(menu);
		}
	}
	
	private static void UserRegister() {
		System.out.println("*****欢迎新用户注册*****");
		boolean sr = false;
		System.out.println("请输入您要注册用户名：");
		String userName = sc.next();
		System.out.println("请输入您的密码：");
		String userPassWord = sc.next();
		//将用户名和密码存储到 变量中
		sr = set.add(new User(userName,userPassWord));
		// sr 的初始化赋值就是false ！ 不等于的意思 负负得正  if（！sr）这个条件就是判断用户名是否相同
		if(!sr) {
			System.out.println("用户名已经被注册！！！请重新输入");
		}else {
			System.out.println("恭喜您，注册成功！！！");
		}
		
		operation();
	}
	
	private static void userLog() {
		System.out.println("*****欢迎登录本系统****");
		User user3 = new User();
		while(true) {
			System.out.println("请输入您的登录用户名：");
			String userNameLog = sc.next();
			System.out.println("请输入您的登录密码：");
			String userPassWordLog = sc.next();
			//在User类中 已经创建了一个有参的构造方法 new 对象的实质就是在调用他的构造方法
			User user = new User(userNameLog,userPassWordLog);
			//contains 如果此映射包含指定键的映射 就返回true 判断用户名是否存在
			boolean sr = set.contains(user);
			if(!sr) {
				System.out.println("用户名不存在,请重新输出");
			}else {
				//iterator 迭代器
				Iterator iterator = set.iterator();
				while(iterator.hasNext()) {
					User user2 = iterator.next();
					//	判断输入的控制台与登录时的用户名与密码相等
					if(user2.getUserName().equals(userNameLog) && user2.getUserPassWord().equals(userPassWordLog)) {
						System.out.println("登录成功，欢迎"+userNameLog+"使用本系统");
						operation();
					}
				}
				System.out.println("登录失败，密码错误");
			}
		}
	}
	
	private static void operation() {
		System.out.println("是否继续操作? t是:否");
			String bool = sc.next();
			if(bool.equals("是")) {
				//	继续操作就进入登录循环
				userLog();
			}else if(bool.equals("否")){
				System.out.println("正在退出请稍后》》》");
				System.out.println("成功退出");
				System.exit(0);
			}else{
				System.out.println("暂时还未开通此功能，请重新输入：");
			}
		}
}

效果图