2D ArrayList<Solution>

public class KBowlOpps{
    public static ArrayList<QuestionAnswer> getChallengeQuestions(){
        ArrayList<QuestionAnswer> questAns = new ArrayList<QuestionAnswer>();
        /**
         * for(int i=0;i<questAns.length;i++){
            questAns[i] = new QuestionAnswer();
        }
         */
        int j = 0;
        int k = 0;
        int rI;
        for(int i = 0; i < 20;i++){
            for(; j < (k+3) && j < 60; j++){
                Random r = new Random();
                try{
                    rI = r.nextInt(arrays.get(i).size());
                    while(rI%2 != 0){
                        rI++;
                    }
                        //questAns[j].setQuestion(arrays[i][rI]);
                        //questAns[j].setAnswer(arrays[i][(rI + 1)]);
                    questAns.add(new QuestionAnswer(arrays.get(i).get(rI), arrays.get(i).get(rI + 1)));
                }catch(IndexOutOfBoundsException e){

                }
            }
            k = j;
        }
        questAns = shuffle(questAns);
        for(int l = 0; l <questAns.size() && questAns.get(l).getQuestion() != null; l++){
            System.out.println((l + 1)+") "+questAns.get(l).getQuestion());
            System.out.println("    "+(l + 1)+") "+questAns.get(l).getAnswer());
        }
        return questAns;
    }
    public static ArrayList<QuestionAnswer> shuffle(ArrayList<QuestionAnswer> in){
        ArrayList<QuestionAnswer> out = new ArrayList<QuestionAnswer>();
        ArrayList<Integer> used = new ArrayList<Integer>();
        int usedInt;
        Random r = new Random();
        for(int i = 0; i < in.size(); i++){
            usedInt = r.nextInt(in.size());
            while(used.contains(usedInt)){
                usedInt = r.nextInt(in.size());
            }
            out.add(in.get(usedInt));
            used.add(usedInt);
        }
        return out;
    }
}

public class KBowlCats{
    public final static File MATH = new File("src/assets/files/math.txt");
    public final static File GLOBAL_TECH = new File("src/assets/files/gt.txt");
    public final static File ARTS = new File("src/assets/files/arts.txt");
    public final static File CAPITALS  = new File("src/assets/files/cap.txt");
    public final static File ENGLISH = new File("src/assets/files/eng.txt");
    public final static File DEFAULT = new File("src/assets/files/default.txt");
    public final static File GEOGRAPHY = new File("src/assets/files/geo.txt");
    public final static File GOVERNMENT = new File("src/assets/files/gov.txt");
    public final static File HEALTH = new File("src/assets/files/hea.txt");
    public final static File HISTORY = new File("src/assets/files/his.txt");
    public final static File ITF = new File("src/assets/files/itf.txt");
    public final static File LITERATURE = new File("src/assets/files/lit.txt");
    public final static File OHIO_HISTORY = new File("src/assets/files/ohi.txt");
    public final static File OUR_US = new File("src/assets/files/ous.txt");
    public final static File POTPURRI = new File("src/assets/files/pot.txt");
    public final static File SAFETY = new File("src/assets/files/saf.txt");
    public final static File SCIENCE = new File("src/assets/files/sci.txt");
    public final static File SPELLING = new File("src/assets/files/spe.txt");
    public final static File SPORTS = new File("src/assets/files/spo.txt");
    public final static File VIP = new File("src/assets/files/vip.txt");
    public final static File WORK_LEADERSHIP = new File("src/assets/files/wor.txt");

    public static ArrayList<String> arts = new ArrayList<String>();
    public static ArrayList<String> capitals = new ArrayList<String>();
    public static ArrayList<String> english = new ArrayList<String>();
    public static ArrayList<String> geography = new ArrayList<String>();
    public static ArrayList<String> globalTech = new ArrayList<String>();
    public static ArrayList<String> government = new ArrayList<String>();
    public static ArrayList<String> health = new ArrayList<String>();
    public static ArrayList<String> history = new ArrayList<String>();
    public static ArrayList<String> itf = new ArrayList<String>();
    public static ArrayList<String> literature = new ArrayList<String>();
    public static ArrayList<String> math = new ArrayList<String>();
    public static ArrayList<String> ohioHistory = new ArrayList<String>();
    public static ArrayList<String> ourUS = new ArrayList<String>();
    public static ArrayList<String> potpurri = new ArrayList<String>();
    public static ArrayList<String> safety = new ArrayList<String>();
    public static ArrayList<String> science = new ArrayList<String>();
    public static ArrayList<String> spelling = new ArrayList<String>();
    public static ArrayList<String> sports = new ArrayList<String>();
    public static ArrayList<String> vip = new ArrayList<String>();
    public static ArrayList<String> workLeadership = new ArrayList<String>();

    public static ArrayList<ArrayList<String>> fillArrays(){
        ArrayList<ArrayList<String>> out = new ArrayList<ArrayList<String>>();
        Scanner in;
        try {
            in = new Scanner(MATH);
            while(in.hasNext()){
                math.add(in.nextLine());
            }
            out.add(math);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ MATH+" not found.");
        }
        try {
            in = new Scanner(GLOBAL_TECH);
            while(in.hasNext()){
                globalTech.add(in.nextLine());
            }
            out.add(globalTech);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ GLOBAL_TECH+" not found.");
        }
        try {
            in = new Scanner(ARTS);
            while(in.hasNext()){
                arts.add(in.nextLine());
            }
            out.add(arts);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ ARTS+" not found.");
        }
        try {
            in = new Scanner(CAPITALS);
            while(in.hasNext()){
                capitals.add(in.nextLine());
            }
            out.add(capitals);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ CAPITALS+" not found.");
        }
        try {
            in = new Scanner(ENGLISH);
            while(in.hasNext()){
                english.add(in.nextLine());
            }
            out.add(english);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ ENGLISH+" not found.");
        }
        try {
            in = new Scanner(GEOGRAPHY);
            while(in.hasNext()){
                geography.add(in.nextLine());
            }
            out.add(geography);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ GEOGRAPHY+" not found.");
        }
        try {
            in = new Scanner(GOVERNMENT);
            while(in.hasNext()){
                government.add(in.nextLine());
            }
            out.add(government);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ GOVERNMENT+" not found.");
        }
        try {
            in = new Scanner(HEALTH);
            while(in.hasNext()){
                health.add(in.nextLine());
            }
            out.add(health);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ HEALTH+" not found.");
        }
        try {
            in = new Scanner(HISTORY);
            while(in.hasNext()){
                history.add(in.nextLine());
            }
            out.add(history);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ HISTORY +" not found.");
        }
        try {
            in = new Scanner(ITF);
            while(in.hasNext()){
                itf.add(in.nextLine());
            }
            out.add(itf);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ ITF+" not found.");
        }
        try {
            in = new Scanner(LITERATURE);
            while(in.hasNext()){
                literature.add(in.nextLine());
            }
            out.add(literature);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ LITERATURE+" not found.");
        }
        try {
            in = new Scanner(OHIO_HISTORY);
            while(in.hasNext()){
                ohioHistory.add(in.nextLine());
            }
            out.add(ohioHistory);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ OHIO_HISTORY+" not found.");
        }
        try {
            in = new Scanner(OUR_US);
            while(in.hasNext()){
                ourUS.add(in.nextLine());
            }
            out.add(ourUS);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ OUR_US+" not found.");
        }
        try {
            in = new Scanner(POTPURRI);
            while(in.hasNext()){
                potpurri.add(in.nextLine());
            }
            out.add(potpurri);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ POTPURRI+" not found.");
        }
        try {
            in = new Scanner(SAFETY);
            while(in.hasNext()){
                safety.add(in.nextLine());
            }
            out.add(safety);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ SAFETY+" not found.");
        }
        try {
            in = new Scanner(SCIENCE);
            while(in.hasNext()){
                science.add(in.nextLine());
            }
            out.add(science);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ SCIENCE+" not found.");
        }
        try {
            in = new Scanner(SPELLING);
            while(in.hasNext()){
                spelling.add(in.nextLine());
            }
            out.add(spelling);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ SPELLING+" not found.");
        }
        try {
            in = new Scanner(SPORTS);
            while(in.hasNext()){
                sports.add(in.nextLine());
            }
            out.add(sports);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ SPORTS+" not found.");
        }
        try {
            in = new Scanner(VIP);
            while(in.hasNext()){
                vip.add(in.nextLine());
            }
            out.add(vip);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ VIP+" not found.");
        }
        try {
            in = new Scanner(WORK_LEADERSHIP);
            while(in.hasNext()){
                workLeadership.add(in.nextLine());
            }
            out.add(workLeadership);
        } catch (FileNotFoundException e) {
            System.err.println("File: "+ WORK_LEADERSHIP+" not found.");
        }
        return out;
    }
}