[英]Stack Overflow Error with toStrings() (java)
我的兩個toString()似乎處於無限循環中,但我不確定問題是什么。 我已經調試了幾個小時了,看不出任何錯誤。
對於上下文,main的相關部分是:System.out.println(class1); adminStaff1.assignInstructor(class1,instructor1); 的System.out.println(1類);
第一個println工作,但是當我調試時,我看到一個源查找錯誤,然后才能通過。 第二個class1創建StackOverflowError,它是:
Exception in thread "main" java.lang.StackOverflowError
at java.lang.AbstractStringBuilder.append(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.lang.StringBuilder.<init>(Unknown Source)
at Instructor.toString(Instructor.java:59)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at Class.toString(Class.java:89)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.util.AbstractCollection.toString(Unknown Source)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at Instructor.toString(Instructor.java:59)
Class的toString是:
@Override
public String toString() {
return "Class [instructor=" + instructor + ", lectureHall="
+ lectureHall + ", currentEnrollment=" + currentEnrollment
+ ", timeSlot=" + timeSlot + ", filled=" + filled
+ ", studentList=" + studentList + "]";
}
教師的toString是:
@Override
public String toString() {
return "Instructor [salary=" + salary + ", classList=" + classList
+ ", openTimeSlots=" + openTimeSlots + ", "
+ super.toString() + "]";
}
而super.toString()是:
@Override
public String toString() {
return "[idNumber=" + idNumber + ", email=" + email
+ "]";
}
我不知道為什么,但是adminStaff1.assignInstructor似乎也在解決這個問題,它是:
public void enrollStudent(Student student, Class aClass){
aClass.checkIfFilled();
if(!aClass.getFilled()){
aClass.addStudent(student);
student.addClass(aClass);
aClass.increaseEnrollment();
} else {
System.out.println("Could not add student because the class is currently full.");
}
}
如果有人能幫助我理解錯誤,我真誠地感謝。 謝謝。
在Class
上調用toString()
,它包含Instructor
(並且Instructor
包含Class
)。 這是一個循環。 打破它,或者
return "Instructor [salary=" + salary + /* ", classList=" + classList */
+ ", openTimeSlots=" + openTimeSlots + ", "
+ super.toString() + "]";
要么,
return "Class [lectureHall=" + lectureHall + ", currentEnrollment="
+ currentEnrollment + ", timeSlot=" + timeSlot + ", filled=" + filled
+ ", studentList=" + studentList + "]";
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