Question

public static void main(String[] args) {
    Scanner reader = new Scanner(System.in);
    while (true) {
        System.out.print("Type password:\t");
        String command = reader.nextLine();
        if (command.equals("carrot")) {
            break;

        } else {
            System.out.println("Wrong!");
        }

    }
    System.out.println("Right!");
    System.out.println("The secret is: jryy qbar!");
    reader.close();
}

我想在这里添加最多3次尝试，我尝试了不同的组合，例如＆＃34; int n = 0;对于（n> 3; n ++）＆＃34;但它并没有像预期的那样发挥作用

Answer 1

您应该为while条款添加条件。

import java.util.Scanner; public class Main {

public static void main(String[] args) {
    Scanner reader = new Scanner(System.in);
    int i = 0;
    boolean isPasswordCorrect = false;
    while (i++ < 3) {
        System.out.print("Type password:\t");
        String command = reader.nextLine();
        if (command.equals("carrot"))  {
            isPasswordCorrect = true;
            break;
        } else{
            System.out.println("Wrong!");
        }
    }
    if(isPasswordCorrect) {
        System.out.println("Right!");
        System.out.println("The secret is: jryy qbar!");
    }
    reader.close();
    }
}

PROTIP：扫描程序实现AutoCloseable，因此您可以在此处使用try-with-resources：

try (Scanner reader = new Scanner(System.in)) {
  // your code using scanner
}

Answer 2

public static void main(String[] args) {
    Scanner reader = new Scanner(System.in);
    int maxAttempts = 3;
    while (maxAttempts > 0) {
        System.out.print("Type password:\t");
        String command = reader.nextLine();
        if (command.equals("carrot"))  {
            System.out.println("Right!");
            break;
        } else{
            System.out.println("Wrong!");
            System.out.println("The secret is: jryy qbar!");
            maxAttempts--;
            if(maxAttempts == 0){
                System.out.println("You have reached the max number of attempts!");
            }
        }
    }
    reader.close();
}

Answer 3

def calc(request):
    form = CalcForm(request.GET)

    if form.is_valid():
       # all fields are valid
       data = form.cleaned_data

Answer 4

public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        int i = 0;
        while (true) {
            System.out.print("Type password:\t");
            String command = reader.nextLine();
            if (command.equals("carrot")) {
                System.out.println("Right!");
                System.out.println("The secret is: jryy qbar!");
                break;
            } else {
                i++;
                System.out.println("Wrong!");
                if (i == 3) {
                    System.out.println("Max attempts reached!! Exiting....");
                    break;
                }
            }
        }
        reader.close();
}

如何添加此java代码的尝试次数

4 个答案: