用户名和密码登录java项目

• Z时代
• 2024-01-10
• 分类：问答

我试图编写一个程序，让您选择，如果你想注册或登录，如果选择作者明智，它会让你知道，你只能选择注册或登录... 我有一个问题，即程序有时会停留在循环中，这告诉我我输入了错误的输入，尽管我输入了“登录”并且无法退出该循环。 我得到的另外一个问题是登录代码： 我添加了user_id，它等于用户count+1，我想检查用户和通过登录的用户是否都正确使用for循环的用户，并检查用户输入是否等于每个用户的密码user_id，我只是不知道该怎么做我想也许给任何用户的对象与计数，所以我可以检查用户一通过一个在我的for循环user_id.username和user_id.password.用户名和密码登录java项目

import java.util.Scanner; 
public class users { 
    public String user_name; 
    public int user_id = 1; 
    private String password; 
    public static int count = 1; 
    public static String input; 
    public users(String Ruser, String Rpassword) { 
     this.user_id = count++; 
     this.user_name = Ruser; 
     this.password = Rpassword; 
     count++; 
     System.out.printf("User %s has been crated \n", Ruser); 
     System.out.printf("Enter 'login' to log in or 'register' to open another account"); 
    } 
    public static void login(String Luser, String Lpassword) { 
     for (int i = 1; i <= count; i++) { 
      System.out.printf("Enter 'login' to log in or 'register' to open another account"); 
      // user_id.users 
      // if(this.user_name) 
     } 
    } 
    public static void main(String[] args) { 
     Scanner scanner = new Scanner(System.in); 
     System.out.println("login"); 
     System.out.println("register"); 
     input = scanner.nextLine(); 
      while (input.equals("login")) { 
       System.out.println("username"); 
       String Luser = scanner.nextLine(); 
       System.out.println("Password"); 
       String Lpassword = scanner.nextLine(); 
       int a = count; 
       login(Luser, Lpassword); 
       System.out.println(""); 
       input = scanner.nextLine(); 
      } 
      while (input.equals("register")) { 
       System.out.println("username"); 
       String Ruser = scanner.nextLine(); 
       System.out.println("Password"); 
       String Rpassword = scanner.nextLine(); 
       users count = new users(Ruser, Rpassword); 
       System.out.println(""); 
       input = scanner.nextLine(); 
      } 
      while ((!input.equals("register")) || (!input.equals("login"))) { 
       System.out.println("invild option, chose login or regiser!"); 
       input = scanner.nextLine(); 
     } 

回答：

public static void main(String[] args) { 
    Scanner scanner = new Scanner(System.in); 
    System.out.println("login"); 
    System.out.println("register"); 
    while(true) { 
     input = scanner.nextLine(); 
     switch(input) { 
     case "exit": 
      System.exit(0); 
      break; 
     case "login": 
      System.out.println("username"); 
      String Luser = scanner.nextLine(); 
      System.out.println("Password"); 
      String Lpassword = scanner.nextLine(); 
      int a = count; 
      login(Luser, Lpassword); 
      System.out.println(""); 
      //    input = scanner.nextLine(); 
      break; 
     case "register": 
      System.out.println("username"); 
      String Ruser = scanner.nextLine(); 
      System.out.println("Password"); 
      String Rpassword = scanner.nextLine(); 
      Users count = new Users(Ruser, Rpassword); 
      System.out.println(""); 
      //    input = scanner.nextLine(); 
      break; 
     default: 
      System.out.println("invild option, chose login, regiser or exit!"); 
      continue; 
     } 
    } 

以上是 用户名和密码登录java项目 的全部内容， 来源链接： utcz.com/qa/266768.html