我的密码检查器一直陷入无限循环

Question

每次运行此程序时，我都会遇到无限循环，每次运行此程序时都会重复 else 语句“此密码不正确”

如果还有的话我还犯了什么其他错误？

public static void ValidChecker() {
        Scanner scanner = new Scanner(System.in);
        
        boolean correct = false;
        while(correct == false)
        System.out.println("please enter a password");
        String pass = scanner.next();
        for(int i = 0; i<pass.length(); i++) {
            if(pass.charAt(i) == '!' && pass.length() > 8 ) {
                System.out.println("this password is correct");
                correct = true;
                    break;
            }
            else {
                System.out.println("this password is incorrect");
                break;
            }
            
        }

Answer 1

这是代码的 MRE，修复了您可以自己运行并尝试的问题

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        boolean correct = false;
        while(correct == false) {
            System.out.println("please enter a password");
            String pass = scanner.next();
            for(int i = 0; i<pass.length(); i++) {
                if(pass.charAt(i) == '!' && pass.length() > 8 ) {
                    System.out.println("this password is correct");
                    correct = true;
                    break;
                }
                else {
                    System.out.println("this password is incorrect");
                    break;
                }
            }
        }
    }
}

您的代码中的错误是缺少花括号。请记住，如果没有花括号，像

if

、

while

等条件只会运行条件后的第一行。在你的情况下它会运行

 while(correct == false) System.out.println("please enter a password");

。