用数组实现登陆注册

r囧r小猫 2024-04-17 05:38 76阅读 0赞

## 用数组实现登陆注册 ##

package com.zr.demo01;
    
    import java.util.Scanner;
    
    //用数组实现登陆注册
    public class Eighth {
    
    	public static void main(String[] args) {
    		@SuppressWarnings("resource")
    		Scanner sc = new Scanner(System.in);
    		//用户名数组
    		String[] usernames=new String[10];
    		//密码数组
    		String[] passwords=new String[10];
    		System.out.println("********************欢迎进入登陆注册系统***********************************");
    		while(true) {
    			//系统菜单
    			menu();
    			System.out.println("请选择你的操作指令:");
    			String choice = sc.next();
    			//选择指令
    			switch (choice) {
    			case "1":
    				register(usernames, passwords);
    				break;
    			case "2":
    				login(usernames, passwords);
    				break;
    			case "3":
    				System.out.println("欢迎下次使用.");
    				//正常退出系统
    				System.exit(0);
    			default:
    				System.out.println("您输入的操作指令不正确.");
    				break;
    			}
    		}
    	}
    	
    	/**
    	 * 系统菜单
    	 */
    	private static void menu() {
    		System.out.println("******************************");
    		System.out.println("1.注册");
    		System.out.println("2.登录");
    		System.out.println("3.退出系统");
    		System.out.println("******************************");
    	}
    
    	/**
    	 * 注册
    	 * @param usernames
    	 * @param passwords
    	 */
    	public static void register(String[] usernames,String[] passwords) {
    		Scanner sc = new Scanner(System.in);
    		System.out.println("请输入用户名:");
    		String username = sc.next();
    		System.out.println("请输入密码:");
    		String password = sc.next();
    		//遍历数组
    		for (int i = 0; i < usernames.length; i++) {
    			if (usernames[i]==null) {
    				usernames[i]=username;
    				passwords[i]=password;
    				System.out.println("注册成功");
    				return;
    			}
    		}
    		//数组已满
    		System.out.println("名额已满,不能再注册");
    	}
    	
    	
    	
    	
    	/**
    	 * 登录
    	 * @param usernames
    	 * @param passwords
    	 */
    	public static void login(String[] usernames,String[] passwords) {
    		@SuppressWarnings("resource")
    		Scanner sc = new Scanner(System.in);
    		System.out.println("请输入用户名:");
    		String username = sc.next();
    		System.out.println("请输入密码:");
    		String password = sc.next();
    		//产生随机六位验证码
    		int code=(int)((Math.random()*9+1)*100000);
    		System.out.println("请输入验证码("+code+"):");
    		String codeString = sc.next();
    		for (int i = 0; i < usernames.length; i++) {
    			//首先判断是否为空,为空直接结束函数
    			if (usernames[i]==null) {
    				System.out.println("用户名或密码错误.");
    				return;
    			}else {
    				//判断验证码是否正确
    				if (codeString.equals(code+"")) {
    					//验证码正确,判断用户名和密码是否正确
    					if (usernames[i].equals(username)&&passwords[i].equals(password)) {
    						//正确,登陆成功
    						System.out.println("登录成功.");
    						return;
    					}
    				}else {
    					//验证码错误
    					System.out.println("验证码错误.");
    					return;
    				}
    			}
    		}
    		//超过数组范围
    		System.out.println("用户名或密码错误");
    	}
    
    }