我的toString()方法似乎出现了无限循环,但我不确定问题出在哪里。我已经调试了几个小时了,也没有发现任何错误。
为了更好的理解,以下是主要部分的相关内容: System.out.println(class1); adminStaff1.assignInstructor(class1, instructor1); System.out.println(class1);
第一个println函数可以正常运行,但在调试时我看到一个源代码查找错误。第二个class1创建了StackOverflowError,即:
Class的toString方法是:
为了更好的理解,以下是主要部分的相关内容: System.out.println(class1); adminStaff1.assignInstructor(class1, instructor1); System.out.println(class1);
第一个println函数可以正常运行,但在调试时我看到一个源代码查找错误。第二个class1创建了StackOverflowError,即:
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方法是:
@Override
public String toString() {
return "Class [instructor=" + instructor + ", lectureHall="
+ lectureHall + ", currentEnrollment=" + currentEnrollment
+ ", timeSlot=" + timeSlot + ", filled=" + filled
+ ", studentList=" + studentList + "]";
}
Instructor的toString方法是:
@Override
public String toString() {
return "Instructor [salary=" + salary + ", classList=" + classList
+ ", openTimeSlots=" + openTimeSlots + ", "
+ super.toString() + "]";
}
而super.toString()的结果是:
@Override
public String toString() {
return "[idNumber=" + idNumber + ", email=" + email
+ "]";
}
我不确定为什么,但是adminStaff1.assignInstructor似乎也在造成问题,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.");
}
}
我希望你能帮助我理解出了什么问题,非常感谢。