特殊字符检查(如果语句不起作用)。爪哇

时间:2020-07-09 01:19:39

标签: java if-statement special-characters

对于初学者来说,我对Java很陌生,所以我不确定是否有更简单的方法可以做到这一点。我目前正在创建密码检查器。除了我的特殊字符检查外,我的大多数代码都能流畅运行。

我的代码检查长度,是否有数字,但是不检查特殊字符。我目前将if语句设置为如果字符串中的字符之一不是字母,数字或空格,则要设置specialCharCheck = true。否则,请保留为假。

import java.util.Scanner;

public class Project5_Part1 {

    public static void main(String[] args) {
        String pass;
        String confirm;
        boolean parameters;
        
        Scanner in = new Scanner(System.in);
        
        System.out.print("Please enter password : ");
        pass = in.nextLine();
        
        System.out.print("Please re-enter the password to confirm : ");
        confirm = in.nextLine();
        
        parameters = isValid(pass);
        
        while (!pass.equals(confirm) || (!parameters)) 
        {
            System.out.println("The password is invalid");
            
            System.out.print("Please enter the password again : ");
            pass = in.nextLine();
            
            System.out.print("Please re-enter the password to confirm : ");
            confirm = in.nextLine();
            
            parameters = isValid(pass);

        }
        if (isValid(pass)) 
        {
            System.out.println("The password is valid");
        }
    }

    public static boolean isValid(String pass) {
        boolean numberCheck = false;
        boolean specialCharCheck = false;

        if (pass.length() < 8) {
            return false;
        } else {

            for (int i = 0; i < pass.length(); i++) 
            {
                if(Character.isDigit(pass.charAt(i))) 
                {
                    numberCheck = true;
                }
                
                if (!Character.isLetterOrDigit(i) && !Character.isSpaceChar(i))
                {
                    specialCharCheck = true;
                    //System.out.println("Test");
                }
                else 
                {
                    specialCharCheck = false;
                }

                
            }
            return (numberCheck && specialCharCheck);

        }
    }
}

我错过了一个简单的错误吗?我知道还有另一种方法可以做到这一点,但我觉得这样做更有效。而且逻辑对我来说很有意义。

2 个答案:

答案 0 :(得分:1)

Character.isLetterOrDigit(char)需要一个字符作为参数,但是您将其传递为“ int i”。您需要拥有

if (!Character.isLetterOrDigit(pass.charAt(i)) && !Character.isSpaceChar(pass.charAt(i)))
                {
                    specialCharCheck = true;
                    //System.out.println("Test");
                }
                else 
                {
                    specialCharCheck = false;
                }

答案 1 :(得分:-1)

这里有while解决方案:

    public static boolean isValid(String pass) {
        boolean numberCheck = false;
        boolean specialCharCheck = false;

        if (pass.length() < 8) {
            return false;
        } else {
            int i = 0;
            while (i < pass.length() && (!numberCheck || !specialCharCheck)) {
                if (!numberCheck && Character.isDigit(pass.charAt(i))) {
                    numberCheck = true;
                }
                if (!specialCharCheck && !Character.isLetterOrDigit(i) && !Character.isSpaceChar(i)) {
                    specialCharCheck = true;
                }
                i++;
            }
            return (numberCheck && specialCharCheck);

        }
    }