java - 问题返回数组

Question

我有一个驾驶执照测试程序，其中用户在主方法中输入答案，然后在一个单独的类中需要有一个方法来查看用户是否通过了一个方法来判断有多少是错的和正确的，并且一个方法会输入数字将错误的答案放入数组中，然后主要方法需要打印出每个方法的结果。我的问题是错误的问题编号数组。我相信我正确地创建了它，但我无法获得将其打印出来的主要方法。谢谢

   public class DriverExam
   {
      static String[] correctAnswers={"b","d","a","a","c","a","b","a","c","d","b","c","d","a","d","c","c","b","d","a"};
      static String[] userAnswers=new String[20];


   //constructer
      public  DriverExam(String[] user)
      {
         userAnswers=user;
      }




   //method to see if you passed
      public static boolean passed()
      {
         boolean pass=false;
         int correctCount=0;
         int incorrectCount=0;
         for(int i=0;i<userAnswers.length;i++)
         {
            if(userAnswers[i].equals(correctAnswers[i]))
            {
               correctCount++;
            }
            else
            {
               incorrectCount++;
            }
         }

         if(correctCount>14)
         {pass=true;}
         return pass;

      }

      //method to find number correct
      public static int totalCorrect()
      {
         boolean pass=false;
         int correctCount=0;
         int incorrectCount=0;
         for(int i=0;i<userAnswers.length;i++)
         {
            if(userAnswers[i].equals(correctAnswers[i]))
            {
               correctCount++;
            }
            else
            {
               incorrectCount++;
            }
         }

         return correctCount;

      }

      //method to tell how many were not correct
      public static int totalIncorrect()
      {
         boolean pass=false;
         int correctCount=0;
         int incorrectCount=0;
         for(int i=0;i<userAnswers.length;i++)
         {
            if(userAnswers[i].equals(correctAnswers[i]))
            {
               correctCount++;
            }
            else
            {
               incorrectCount++;
            }
         }

         return incorrectCount;

      }

      public static int[] questionsMissed()
      {

         boolean pass=false;
         int correctCount=0;
         int incorrectCount=0;
         for(int i=0;i<userAnswers.length;i++)
         {
            if(userAnswers[i].equals(correctAnswers[i]))
            {
               correctCount++;
            }
            else
            {
               incorrectCount++;
            }
         }
      int[] questionWrong=new int[incorrectCount];

      for(int i=0;i<questionWrong.length;i++)
      {
      if(!userAnswers[i].equals(correctAnswers[i]))
      {i=questionWrong[i];
      }
      }
      return questionWrong;
      }
      }

import java.util.Scanner;
public class DriverExamDemo
{
public static void main(String[] args)
{
String[] userAnswers=new String[20];
String answer;

System.out.println("please enter the testee's answers as the correspond with the question number");

for(int i=0;i<userAnswers.length;i++)
{
Scanner input=new Scanner(System.in);
System.out.println("Q."+(i+1));
answer=input.next();
userAnswers[i]=answer;
}
// constructor to send the users answers
DriverExam exam1 = new DriverExam(userAnswers);

//Check passed boolean to see if the user passed or failed
if(DriverExam.passed())
System.out.println("you passed your driving exam");
else
System.out.println("you failed your driving exam");

//check how many answers were correct and incorrect
System.out.println("you answered "+DriverExam.totalCorrect()+" questions correctly");
System.out.println("you answered "+DriverExam.totalIncorrect()+" questions incorrectly");

int[] questionsWrong=DriverExam.questionsMissed();
for (int i=0;i<questionsWrong.length;i++)
{
System.out.println("you got question " +questionsWrong[i]+"incorrect");



}
}
}

Answer 1

检查以下行，因为它没有意义，您正在为循环控制变量分配一个空数组的值。

i = questionWrong[i];

但是，你用来检查错误问题数字的整个算法是错误的，你应该尝试另一个。使用您的实现，您只需要解决整个问题的一个子集，您应该遍历所有问题，并获得不正确问题的数量。

顺便说一句，我认为您正在大量使用静态方法。从广义上讲，最好使用实例方法，并且对于您的情况是完全有效的。在您的情况下使用实例方法，允许在构造函数中进行所有计算，或者由构造函数调用方法，并避免在整个代码中重复相同的代码（循环）。