Question

我需要初始化密码。密码不等于密码，小于3的密码不断询问用户密码。如果密码不正确，则授予密码正确的打印访问权限。

import java.util.Scanner;

public class PasswordChecker {
  public static void main (String [] args) {

   Scanner in = new Scanner(System.in);

    String secretPassword = "alejandra";
    String password;
    int attempts = 3;

      System.out.println("Please enter password");
       password = in.nextLine ();


      while (!password.equals(secretPassword) && attempts<3) 
    System.out.println ("incorrect try again");
      password = in.nextLine ();
      if (password.equals (secretPassword)
       System.out.println ("access granted");
  }
}

Answer 1

试试这个

更改为do while
添加大括号
设置尝试更正值
将)添加到if

增加attempts计数器

Scanner in = new Scanner(System.in);

String secretPassword = "alejandra";
String password;
int attempts = 1;

do {
  System.out.println("Please enter password");
   password = in.nextLine ();
   if (password.equals (secretPassword)) {
       System.out.println ("access granted");
       break;
   }
   if (attempts < 3)
       System.out.println ("incorrect try again");
   else 
       System.out.println ("failed");       
}
while (attempts++ < 3);

或者如果您想要while循环解决方案

    Scanner in = new Scanner(System.in);

    String secretPassword = "alejandra";
    String password;
    int attempts = 0;

    while (attempts++ < 3) {
      System.out.println("Please enter password");
       password = in.nextLine ();
       if (password.equals (secretPassword)) {
           System.out.println ("access granted");
           break;
       }
       if (attempts < 3)
           System.out.println ("incorrect try again");
       else 
           System.out.println ("failed");
    }

Answer 2

玩得开心。

如果您强调计数器，最好使用forloop而不是while循环，因为它会导致多次尝试。

    public static void main (String [] args) {

   Scanner in = new Scanner(System.in);

    String secretPassword = "alejandra";
    String password;
    int attempts = 3;

      System.out.println("Please enter password");
       password = in.nextLine ();


     for(int i=1;i<=attempts;i++){
    System.out.println ("Incorrect try again");
      password = in.nextLine ();
      if (password.equalsIgnoreCase(secretPassword)){
       System.out.println ("access granted");
  }
     }
}

Answer 3

您有一个无限循环，因为您没有更改attempts变量。

从while循环外部删除password变量并提示，并将while循环更改为：

while(attempts > 0) {
    System.out.print("Enter password: ");
    if(in.nextLine().toLowerCase().equals(secretPassword)) {
        System.out.println("access granted.");
        break;
    }
    else {
        System.out.println("Incorrect. Try again.");
        attempts -= 1;
    }
}

我需要创建一个密码检查器

3 个答案: