如何让FillInTheBlank打印问题(继承)

Question

我是继承新手，在完成赋值时遇到问题。我的错误是收到堆栈溢出错误。

该课程由一个班级继承人组成，打印测试和答案，每个不同的班级都是不同类型的问题。我的程序可以打印对象问题，但不能打印空白问题

如有任何帮助或指向正确方向，我们将不胜感激。

Driver.java

package assignment9testpapers;
public class Driver {
public static void main(String[] args) {
Test trial = new Test( 3, 3);
ObjectiveQuestion obj = new ObjectiveQuestion( 3,  2,  1, "what is 1 + 1",  "2");
trial.addObjectiveQuestion(obj);
ObjectiveQuestion fitbl = new FillInTheBlankQuestion(3 ,2 ,1 , "Who is the professor of 1068", "John Fiore");
trial.addFillInTheBlankQuestion(fitbl);
trial.printTest();
trial.printTestAnswers();
}
}

问题.java

1 package assignment9testpapers;
2
3 public class Question {
4   private int points;
5   private int difficulty;
6   private int answerSpace;
7   private String questionText;
8   
9   public final int MIN_DIFFICULTY = 1;
10  public final int MAX_DIFFICULTY = 5;
11
12  public Question(int points, int difficulty, int answerSpace, String 
questionText) {
13      this.points = points;
14  this.answerSpace = answerSpace;
15      this.questionText = questionText;
16      
17      if(difficulty>=MIN_DIFFICULTY && difficulty <= MAX_DIFFICULTY) {
18          this.difficulty=difficulty;
19      }else if(difficulty<MIN_DIFFICULTY) {
20          this.difficulty=MIN_DIFFICULTY;
21      } else {
22          this.difficulty=MAX_DIFFICULTY;
23      }
24  }
25  
26  public String toString(){
27      return "Points" + points+ "difficulty" + difficulty +"question" + questionText;
28  }
29  
30  public String getQuestionText() {
31      return questionText+makeAnswerSpace();
32  }
33  
34  public int getPoints() {
35      return points;
36  }
37  
38  private String makeAnswerSpace() {
39      String space="";
40      for(int i = 0; i<answerSpace; i++) {
41          space+='n';
42      }
43      return space;
44  }

ObjectiveQuestion.java

package assignment9testpapers;
public class ObjectiveQuestion extends Question {
private String correctAnswer;
public ObjectiveQuestion(int points,int difficulty, int answerSpace, String questionText, String correctAnswer ) {
super(points, difficulty, answerSpace, questionText);
this.correctAnswer=correctAnswer;
}
public String getCorrectAnswer() {
return correctAnswer;
}

}

test.java

package assignment9testpapers;
public class Test {
private String[] questions;
private String[] answer;
private int totalPoints;
private int questionCount = 0;
public Test(int numQuestions, int totalPoints) {
this.questions = new String[numQuestions];
this.answer = new String[numQuestions];
this.totalPoints=totalPoints;
}
public void addObjectiveQuestion(ObjectiveQuestion q) {
questions[questionCount] = q.getQuestionText();
answer[questionCount]=q.getCorrectAnswer();
questionCount++;
}
public void addMultipleChoiceQuestion(MultipleChoiceQuestion q) {
questions[questionCount] = q.getQuestionText();
answer[questionCount]=q.getCorrectAnswer();
questionCount++;
}
public void addFillInTheBlankQuestion(ObjectiveQuestion q) {
questions[questionCount] = q.getQuestionText();
answer[questionCount]=q.getCorrectAnswer();
questionCount++;
} 


public void printTest() {
for (int i = 0; i<questions.length; i++) {
System.out.println(questions[i]);
}
}
public void printTestAnswers() {
for (int i = 0; i<answer.length; i++) {
System.out.println(answer[i]);
}
}   
}

填写空白问题.java

package assignment9testpapers;
public class FillInTheBlankQuestion extends ObjectiveQuestion{
public FillInTheBlankQuestion(int points,int difficulty, int answerSpace, String questionText, String correctAnswer ) {
super(points, difficulty, answerSpace, questionText, correctAnswer);
}
public String getQuestionText() {
return "______________" + getQuestionText();
}
public String getCorrectAnswer() {
return "______" + getQuestionText() + getCorrectAnswer();
}

}

错误消息：

Exception in thread "main" java.lang.StackOverflowError
at java.base/java.lang.StringBuilder.<init>(StringBuilder.java:124)
at assignment9testpapers.FillInTheBlankQuestion.getQuestionText(FillInTheBlankQuestion.java:10)

Answer 1

在"public class FillInTheBlankQuestion"method"public String getQuestionText(("中，您正在调用其内部的方法，导致intentite循环。如果您试图使用超类中的方法，请使用super.getQuestionText.