일부 수학을 수행하는이 자바 프로그램에 문제가 있습니다

Question

기본에있는 어린이들을위한 몇 가지 기본 수학을 수행 한 Java 프로그램을 만들었습니다. 나는 그것을 좀 더 발전시키고 싶었고, 그들이 잘못한 질문을 기억하고, 선택적으로이 질문들을 마지막에 다시 제시하고 다시 한번 시도 할 수있게하려고했다.

하지만 코드가 정말 복잡해졌습니다. 나는 내가 그것을 끝내 었다고 생각했다. 그러나 그것은 편집하는 것이 어려워지고있다. (읽히지 않을 것이다.) 나는 도움이 필요한 시점에있다. 나는 그것을 크게 고맙게 생각한다.

import java.util.Scanner; 
import java.util.Random; 
public class ArithmeticTester0 { 
    public static void main(String[] arg) { 
     int level = 0; 
     String type = ""; 
     String name = "";  
     Scanner keyboard = new Scanner(System.in); 
     System.out.println("Hi! I am your friendly Math Tutor."); 
     System.out.print("What is your name? "); 
     name = keyboard.nextLine(); 
     System.out.print("Would you like to be tested on addition, subtraction or both? "); 
     type = keyboard.nextLine(); 

     // Check if the type inputted is anything other than addition, subtraction or both 
     if (!type.equalsIgnoreCase("addition") && !type.equalsIgnoreCase("subtraction") && !type.equalsIgnoreCase("both") && !type.equalsIgnoreCase("add") && !type.equalsIgnoreCase("subtraction")) { 
      while (!type.equalsIgnoreCase("addition") && !type.equalsIgnoreCase("subtraction") && !type.equalsIgnoreCase("both") && !type.equalsIgnoreCase("add") && !type.equalsIgnoreCase("subtraction")) { 
       System.out.print("You must answer addition, subtraction or both. How about we try again? "); 
       type = keyboard.nextLine(); 
      } 
     } 

     System.out.print("What level would you like to choose? " + 
      " Enter 1, 2 or 3: "); 
     level = keyboard.nextInt(); 

     // Check if the level entered is not 1, 2 or 3 
     if (level > 3 || level < 1) { 
      while (level > 3 || level < 1) { 
       System.out.println("The number must be either 1, 2 or" + 
        " 3. Let's try again shall we?"); 
       System.out.print("What level would you like to choose? "); 
       level = keyboard.nextInt(); 
      } 
     } 

     System.out.println("\nOK " + name + 
      ", here are 10 exercises for you at level " + level + "."); 
     System.out.println("Good luck!\n"); 

     int a = 0, b = 0, c = 0; 
     int preva = 0, prevb = 0; //previous a and b value 
     int correct = 0; 

     if (type.equalsIgnoreCase("addition") || type.equalsIgnoreCase("add")) { 
      add(level, preva, prevb, a, b, c, type); 
     } 
     else if (type.equalsIgnoreCase("subtraction") || type.equalsIgnoreCase("subtract")) { 
      subtract(level, preva, prevb, a, b, c, type); 
     } 
     else { 
      both(level, preva, prevb, a, b, c, type); 
     } 
    } 


    /* The method below prints out a statement depending 
    on how well the child did */ 

    public static void add(int level, int preva, int prevb, int a, int b, int c, String type) { 
     Random random = new Random(); 
     Scanner keyboard = new Scanner(System.in); 

     List<Integer> wrongList = Arrays.asList(array); 

     int correct = 0; 
     int wrong = 0; 

     // Generate 10 questions 
     for (int i = 1; i <= 10; i++) { 

      /* Generate numbers depending on the difficulty. 
      The while loop ensures that the next question isn't the same 
      as the previous question that was just asked. */ 
      if (level == 1) { 
       while (preva == a && prevb == b) { 
        a = random.nextInt(10); 
        b = random.nextInt(11-a); 
       } 
      } 
      else if (level == 2) { 
       while (preva == a && prevb == b) { 
        a = random.nextInt(10); 
        b = random.nextInt(10); 
       } 
      } 
      else if (level == 3) { 
       while (preva == a && prevb == b) { 
        a = random.nextInt(50); 
        b = random.nextInt(50); 
       } 
      } 

      preva = a; 
      prevb = b; 

      System.out.print(a + " + " + b + " = "); 
      c = keyboard.nextInt(); 

      // Check if the user was correct 

      if (a + b == c) { 
       System.out.println("You are right!"); 
       correct++; 
      } 
      if (a - b != c) { 
       wrongList.add(a); 
       wrongList.add(b); 
       wrong++; 
      } 
     } 

     // Conclusion 
     System.out.println("\nYou got " + correct + " right out of 10."); 
     if (wrong > 0) { 

      int[] wrongAnswers = wrongList.toArray(new int[wrongList.size()]); 

      System.out.print("You got " + wrong + " wrong, would you like to retry those questions?"); 
      String response = keyboard.nextLine(); 

      if (response.equalsIgnoreCase("Yes") || response.equalsIgnoreCase("Okay") || response.equalsIgnoreCase("OK") || response.equalsIgnoreCase("Sure") || response.equalsIgnoreCase("Yeah") || response.equalsIgnoreCase("Yea")) { 
       retry(wrongAnswers, type, wrongIndexArray); 
      } 
      else if (response.equalsIgnoreCase("No") || response.equalsIgnoreCase("Nope") || response.equalsIgnoreCase("Nah") || response.equalsIgnoreCase("No thanks") || response.equalsIgnoreCase("Nah") || response.equalsIgnoreCase("Do not want")) { 
       System.out.println("OK! That's fine."); 
      } 
      else { 
       while (response.equalsIgnoreCase("Yes") || response.equalsIgnoreCase("Okay") || response.equalsIgnoreCase("OK") || response.equalsIgnoreCase("Sure") || response.equalsIgnoreCase("Yeah") || response.equalsIgnoreCase("Yea") || response.equalsIgnoreCase("No") || response.equalsIgnoreCase("Nope") || response.equalsIgnoreCase("Nah") || response.equalsIgnoreCase("No thanks") || response.equalsIgnoreCase("Nah") || response.equalsIgnoreCase("Do not want")) { 
        System.out.println("Please put in an answer that is along the lines of \"yes\" or \"no\"."); 
        response = keyboard.nextLine(); 
       } 
      } 
     } 
     conclusion(correct, level); 
     System.out.println("See ya!"); 
    } 

    public static void subtract(int level, int preva, int prevb, int a, int b, int c, String type) { 
     Random random = new Random(); 
     Scanner keyboard = new Scanner(System.in); 

     List<Integer> wrongList = Arrays.asList(array); 

     // Generate 10 questions 
     int correct = 0; 
     int wrong = 0; 

     for (int i = 1; i <= 10; i++) { 

      /* Generate numbers depending on the difficulty. 
      The while loop ensures that the next question isn't the same 
      as the previous question that was just asked. */ 
      if (level == 1) { 
       while (preva == a && prevb == b) { 
        a = random.nextInt(10);  
        b = random.nextInt(11-a); 

        while (b > a) { 
         a = random.nextInt(10); 
         b = random.nextInt(11-a); 
        }  
       } 
      } 
      else if (level == 2) { 
       while (preva == a && prevb == b) { 
        a = random.nextInt(10); 
        b = random.nextInt(10); 

        while (b > a) { 
         a = random.nextInt(10); 
         b = random.nextInt(11-a); 
        } 
       } 
      } 
      else if (level == 3) { 
       while (preva == a && prevb == b) { 
        a = random.nextInt(50); 
        b = random.nextInt(50); 
       } 
      } 

      preva = a; 
      prevb = b; 

      System.out.print(a + " - " + b + " = "); 
      c = keyboard.nextInt(); 

      // Check if the user was correct 

      if (a - b == c) { 
       System.out.println("You are right!"); 
       correct++; 
      } 
      if (a - b != c) { 
       wrongList.add(a); 
       wrongList.add(b); 
       wrong++; 
      } 
     } 
     // Conclusion 
     System.out.println("\nYou got " + correct + " right out of 10."); 
     if (wrong > 0) { 

      int[] wrongAnswers = wrongList.toArray(new int[wrongList.size()]); 

      System.out.print("You got " + wrong + " wrong, would you like to retry those questions?"); 
      String response = keyboard.nextLine(); 

      if (response.equalsIgnoreCase("Yes") || response.equalsIgnoreCase("Okay") || response.equalsIgnoreCase("OK") || response.equalsIgnoreCase("Sure") || response.equalsIgnoreCase("Yeah") || response.equalsIgnoreCase("Yea")) { 
       retry(wrongAnswers, type); 
      } 
      else if (response.equalsIgnoreCase("No") || response.equalsIgnoreCase("Nope") || response.equalsIgnoreCase("Nah") || response.equalsIgnoreCase("No thanks") || response.equalsIgnoreCase("Nah") || response.equalsIgnoreCase("Do not want")) { 
       System.out.println("OK! That's fine."); 
      } 
      else { 
       while (response.equalsIgnoreCase("Yes") || response.equalsIgnoreCase("Okay") || response.equalsIgnoreCase("OK") || response.equalsIgnoreCase("Sure") || response.equalsIgnoreCase("Yeah") || response.equalsIgnoreCase("Yea") || response.equalsIgnoreCase("No") || response.equalsIgnoreCase("Nope") || response.equalsIgnoreCase("Nah") || response.equalsIgnoreCase("No thanks") || response.equalsIgnoreCase("Nah") || response.equalsIgnoreCase("Do not want")) { 
        System.out.println("Please put in an answer that is along the lines of \"yes\" or \"no\"."); 
        response = keyboard.nextLine(); 
       } 
      } 
     } 
     conclusion(correct, level); 
     System.out.println("See ya!"); 
    } 

    public static void both(int level, int preva, int prevb, int a, int b, int c, String type) { 
     Random random = new Random(); 
     Scanner keyboard = new Scanner(System.in); 

     // Generate 10 questions 
     int correct = 0; 

     List<Integer> wrongIndexes = Arrays.asList(array);  

     for (int i = 1; i <= 5; i++) { 

      /* Generate numbers depending on the difficulty. 
      The while loop ensures that the next question isn't the same 
      as the previous question that was just asked. */ 
      if (level == 1) { 
       while (preva == a && prevb == b) { 
        a = random.nextInt(10); 
        b = random.nextInt(11-a); 
       } 
      } 
      else if (level == 2) { 
       while (preva == a && prevb == b) { 
        a = random.nextInt(10); 
        b = random.nextInt(10); 
       } 
      } 
      else if (level == 3) { 
       while (preva == a && prevb == b) { 
        a = random.nextInt(50); 
        b = random.nextInt(50); 
       } 
      } 

      preva = a; 
      prevb = b; 

      System.out.print(a + " + " + b + " = "); 
      c = keyboard.nextInt(); 

      // Check if the user was correct 

      if (a + b == c) { 
       System.out.println("You are right!"); 
       correct++; 
      } 
      else { 
       System.out.println("Oops! You made a mistake. " + a + " + " + b + " = " + (a+b)); 
       wrongIndexes += i; 
      } 
     } 

     for (int i = 6; i <= 10; i++) { 

      /* Generate numbers depending on the difficulty. 
      The while loop ensures that the next question isn't the same 
      as the previous question that was just asked. */ 
      if (level == 1) { 
       while (preva == a && prevb == b) { 
        a = random.nextInt(10);  
        b = random.nextInt(11-a); 

        while (b > a) { 
         a = random.nextInt(10); 
         b = random.nextInt(11-a); 
        }  
       } 
      } 
      else if (level == 2) { 
       while (preva == a && prevb == b) { 
        a = random.nextInt(10); 
        b = random.nextInt(10); 

        while (b > a) { 
         a = random.nextInt(10); 
         b = random.nextInt(11-a); 
        } 
       } 
      } 
      else if (level == 3) { 
       while (preva == a && prevb == b) { 
        a = random.nextInt(50); 
        b = random.nextInt(50); 
       } 
      } 

      preva = a; 
      prevb = b; 

      System.out.print(a + " - " + b + " = "); 
      c = keyboard.nextInt(); 

      // Check if the user was correct 

      if (a - b == c) { 
       System.out.println("You are right!"); 
       correct++; 
      } 
      else { 
       System.out.println("Oops! You made a mistake. " + a + " - " + b + " = " + (a-b)); 
       wrongIndexes += i; 
      } 
     } 

     int[] wrongIndexArray = wrongIndexes.toArray(new int[wrongIndexes.size()]); 

     // Conclusion 
     System.out.println("\nYou got " + correct + " right out of 10."); 
     if (wrong > 0) { 

      int[] wrongAnswers = wrongList.toArray(new int[wrongList.size()]); 

      System.out.print("You got " + wrong + " wrong, would you like to retry those questions?"); 
      String response = keyboard.nextLine(); 

      if (response.equalsIgnoreCase("Yes") || response.equalsIgnoreCase("Okay") || response.equalsIgnoreCase("OK") || response.equalsIgnoreCase("Sure") || response.equalsIgnoreCase("Yeah") || response.equalsIgnoreCase("Yea")) { 
       retry(wrongAnswers, type, wrongIndexArray); 
      } 
      else if (response.equalsIgnoreCase("No") || response.equalsIgnoreCase("Nope") || response.equalsIgnoreCase("Nah") || response.equalsIgnoreCase("No thanks") || response.equalsIgnoreCase("Nah") || response.equalsIgnoreCase("Do not want")) { 
       System.out.println("OK! That's fine."); 
      } 
      else { 
       while (response.equalsIgnoreCase("Yes") || response.equalsIgnoreCase("Okay") || response.equalsIgnoreCase("OK") || response.equalsIgnoreCase("Sure") || response.equalsIgnoreCase("Yeah") || response.equalsIgnoreCase("Yea") || response.equalsIgnoreCase("No") || response.equalsIgnoreCase("Nope") || response.equalsIgnoreCase("Nah") || response.equalsIgnoreCase("No thanks") || response.equalsIgnoreCase("Nah") || response.equalsIgnoreCase("Do not want")) { 
        System.out.println("Please put in an answer that is along the lines of \"yes\" or \"no\"."); 
        response = keyboard.nextLine(); 
       } 
      } 
     } 
     conclusion(correct, level); 
     System.out.println("See ya!"); 
    } 

    public static void retry(int[] wrongAnswers, String type, int[] wrongIndexArray) { 
     int c = 0; 
     if (type.equalsIgnoreCase("addition") || type.equalsIgnoreCase("add")) { 
      for (int i = 0; i < wrongAnswers.length; i+=2) { 
       System.out.print(wrongAnswers[i] + " + " + wrongAnswers[i+1] + " = "); 
       c = keyboard.nextInt(); 

       if (wrongAnswers[i] + wrongAnswers[i+1] == c) { 
        System.out.println("You are right!"); 
       } 
       else { 
        System.out.println("Oops! You made a mistake. " + wrongIndex[i] + " + " + wrongIndex[i+1] + " = " + (wrongIndex[i]+wrongIndex[i+1])); 
       } 
      } 
     } 
     else if (type.equalsIgnoreCase("subtraction") || type.equalsIgnoreCase("subtract")) { 
      for (int i = 0; i < wrongAnswers.length; i+=2) { 
       System.out.print(wrongAnswers[i] + " - " + wrongAnswers[i+1] + " = "); 
       c = keyboard.nextInt(); 

       if (wrongAnswers[i] - wrongAnswers[i+1] == c) { 
        System.out.println("You are right!"); 
       } 
       else { 
        System.out.println("Oops! You made a mistake. " + a + " - " + b + " = " + (a-b)); 
       } 
      } 
     } 
     else { 
      for (int i = 0; i < wrongAnswers.length; i+=2) { 
       for (int i = 0; i < wrongIndexArray.length; i++) { 
        if (wrongIndexArray[i] < 6) { 
         System.out.print(wrongAnswers[i] + " + " + wrongAnswers[i+1] + " = "); 
         c = keyboard.nextInt(); 

         if (wrongAnswers[i] + wrongAnswers[i+1] == c) { 
          System.out.println("You are right!"); 
         } 
         else { 
          System.out.println("Oops! You made a mistake. " + wrongIndex[i] + " + " + wrongIndex[i+1] + " = " + (wrongIndex[i]+wrongIndex[i+1])); 
         } 
        } 
        else if (wrongIndexArray[i] > 5) { 
         System.out.print(wrongAnswers[i] + " - " + wrongAnswers[i+1] + " = "); 
         c = keyboard.nextInt(); 

         if (wrongAnswers[i] - wrongAnswers[i+1] == c) { 
          System.out.println("You are right!"); 
         } 
         else { 
          System.out.println("Oops! You made a mistake. " + wrongIndex[i] + " + " + wrongIndex[i+1] + " = " + (wrongIndex[i]+wrongIndex[i+1])); 
         } 
        } 
       }    
      } 
     } 
    } 

    public static void conclusion(int x, int lev) { 
     if (x >= 9) { 
      if (lev == 3) { 
       if (x == 9) 
        System.out.println("Please try the same difficulty again" + 
         ", you almost scored 10 out of 10!"); 
       else 
        System.out.println("You have mastered addition at this level" + 
         "! The system is not of any further use."); 
      } 
      else { 
       System.out.println("Please select a higher difficulty next time!"); 
      } 
     } 
     else if (x >= 6) { 
      System.out.println("Please try the test again."); 
     } 
     else { 
      System.out.println("Please ask your teacher for extra lessons."); 
     } 
    } 
} 

Answer 1

오류는 다음과 같습니다

1. 당신은 java.util.List가를 가져올 잊어 버렸습니다. 그냥 가서 java.util. *을 가져 오십시오. 너도 알고 싶어.

2. wrongIndexArray, array, wrong, wrongList, keyboard, a 또는 b를 선언하지 않았습니다. 나는 약간을 놓칠지도 모른다. 이 라인에서

3. :

   int[] wrongAnswers =wrongList.toArray(new int[wrongList.size()]);

wrongList는 List<Integer> 그래서 난 당신의 int []에 캐스팅 할 수없는 생각 입니다. Integer []를 사용해야합니다. 아마도

다른,하지만 ... 당신이 가지고있는 오류를 기반으로

..., 당신은 넷빈즈와 같은 IDE를 사용하고 있습니까? IDE를 사용하면 오류의 원인을 파악할 수 있으며 각 오류와 관련하여 유용한 힌트가 포함되는 경우가 많습니다.

다른 어떤 도움이되는 힌트 :

당신이 학생이 답변을 잘못 가져옵니다 목록에서 피연산자를 저장하는 것처럼 보인다. 대신 피연산자와 연산을 SubtractionQuestion 또는 AdditionQuestion과 같은 클래스로 래핑하는 것을 고려하십시오. 나중에 잘못한 학생들에게 재시험을 원할 때 도움이 될 수 있습니다.

스토어 "예"와 ArrayList를 < 문자열 > yesAnswers에서 "아니오"텍스트 답변 (네, 네, 네, 그렇습니다), 그럼 그냥 확인 yesAnswers.contains 경우 (답). 이렇게하면 목록을 쉽게 관리 할 수 ​​있으며 예, 아니요 또는 아니요 또는 아니요에 대해 확인할 필요가 없습니다. 예, 아니요, 그렇지 않으면 나쁜 대답을 확인하십시오.

희망이 맞는 것 ....