Java 如何让FillingBlank打印问题(继承)
我是继承方面的新手,在完成一项任务时遇到问题。我的错误是接收到堆栈溢出错误 该助手由一个班级继承人组成,负责打印测试和答案。每个不同的班级都有不同类型的问题。我的程序可以打印一个对象但不填充空白问题< /p> 任何正确方向的帮助或指示都将不胜感激 Driver.javaJava 如何让FillingBlank打印问题(继承),java,class,inheritance,error-handling,Java,Class,Inheritance,Error Handling,我是继承方面的新手,在完成一项任务时遇到问题。我的错误是接收到堆栈溢出错误 该助手由一个班级继承人组成,负责打印测试和答案。每个不同的班级都有不同类型的问题。我的程序可以打印一个对象但不填充空白问题< /p> 任何正确方向的帮助或指示都将不胜感激 Driver.java package assignment9testpapers; public class Driver { public static void main(String[] args) { Test tr
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();
}
}
question.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 }
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;
}
}
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();
}
}
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]);
}
}
}
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)
线程“main”java.lang.StackOverflower中出现异常
位于java.base/java.lang.StringBuilder。(StringBuilder.java:124)
在作业9TestPapers.FillingBlankQuestion.getQuestionText(FillingBlankQuestion.java:10)
在“public class fillinblankquestion”方法“public String getQuestionText()中,您在其内部调用该方法,从而导致infinite循环。如果您试图从超类使用该方法,请使用super.getQuestionText().您能提供一条错误消息吗?别忘了,我们在堆栈溢出中看不到行号。我刚刚将其添加到问题的底部;我的问题不要忘了,我们在堆栈溢出中看不到行号。等等,StringBuilder?这根本不是a。如果我看到这么高的行号,您遗漏了很多。请使用注释询问更多信息或建议最好的改进。避免在评论中回答问题@ScaryWombat@ScaryWombat既然我把它叫做question.java,那么我应该在方法中调用它吗?