java - 如何向此 java 代码添加尝试次数

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“int n = 0; for (n>3; n++)”，但它并没有真正按预期工作

Answer 1

您应该在 while 子句中添加条件。

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:扫描仪实现 AutoCloseable ，因此您可以使用 try-with-resources这里:

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