Thread: problem returning array

I have a drivers license test program where in the main method the user inputs the answers then in a separate class there needs to be a method to see if the user passed a method to tell how many were wrong and right and a method put the numbers of the answers which were wrong into an array then the main method needs to print out the results of each of those methods. my issues is with the array of the problem numbers that were wrong . I believe I correctly created it but I cant get the main method to print it out.Thanks

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");
 
 
 
}
}
}

The reason isin the questionMissed-method

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

the questionWrong array is initilized with 0 in every position. You set the iterator var every time to zero, so your loop never ends,if there is a wrong question, so the procedure doesnt terminate.

Change to

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

Also you cannot iterate over the questionWrong array, because it's smaller -hopefully for the user-then the question and answer array.

BTW: You mix a little bit the concepts of a static c-like library and the object orientated philosophy of java(setting a static var in a constuctor)