使用for循环创建仅包含数字的密码

Question

我正在制作一个程序，从用户那里获取一个字符串来创建密码。但是，该密码至少需要8个字符或更多，并且只能包含字母(大写和小写)和数字。我已经这样做了，但是，当我在用户输入中输入一个空格(例如:“pass word”)或一个特殊的符号，如“%”或“

import java.util.Scanner;
public class Password
{
    public static void main(String[] args)
    {
        System.out.println("Enter your password");
        Scanner input = new Scanner(System.in);
        String pass = input.nextLine();
        System.out.println("Is the password valid? " + passwordCheck(pass));
    }
    
    public static boolean passwordCheck(String password)
    {   
        boolean pass = false;
        for(int i=0; i < password.length(); i++)
        {
        char c = password.charAt(i);
        if(password.length() >= 8)
        {
            if(c >= 48 && c <= 57)
            {
            pass = true;    
            }
            else if(c>= 97 && c<= 122)
            {
            pass = true; 
            }
            else if(c>=65 && c<=90)
            {
            pass = true;    
            }
            else if(c == 32)
            {
            pass = false;    
            }
        }    
        
        
        }
        return pass;

    }
}

Answer 1

一旦遇到空格或任何其他特殊字符，您需要打破循环。

import java.util.Scanner;
public class Password
{
    public static void main(String[] args)
    {
        System.out.println("Enter your password");
        Scanner input = new Scanner(System.in);
        String pass = input.nextLine();
        System.out.println("Is the password valid? " + passwordCheck(pass));
    }
    
    public static boolean passwordCheck(String password)
    {   
        boolean pass = false;
        for(int i=0; i < password.length(); i++)
        {
        char c = password.charAt(i);
        if(password.length() >= 8)
        {
            // also you can directly mention the character instead of looking for its respective ASCII value
            if(c >= '0' && c <= '9')
            {
                pass = true;
            }
            else if(c>= 'a' && c<= 'z')
            {
                pass = true; 
            }
            else if(c>='A' && c<='Z')
            {
                pass = true;
            }
            else // loop will break if it encounters a space or any other 
 special character
            {
                pass = false;    
                break;
            }
        }    
        
        
        }
        return pass;

    }
}