从数组返回类类型的java
在我的getTopStudent方法中,这里有一个类叫做教室,它表示我的变量“topStudent”尚未初始化,我缺少了什么?,在我的AP java课程的视频中,并非所有内容都有解释
public class Classroom
{
Student[] students;
int numStudentsAdded;
public Classroom(int numStudents)
{
students = new Student[numStudents];
numStudentsAdded = 0;
}
public Student getTopStudent()
{
Student topStudent;
for(int i = 1; i < students.length; i++)
{
if(students[i].getAverageScore() > students[i - 1].getAverageScore())
{
topStudent = students[i];
}
else
{
topStudent = students[i - 1];
}
}
return topStudent;
}
public void addStudent(Student s)
{
students[numStudentsAdded] = s;
numStudentsAdded++;
}
public void printStudents()
{
for(int i = 0; i < numStudentsAdded; i++)
{
System.out.println(students[i]);
}
}
}
我的学生班都在上课,应该没什么问题,不要认为需要解决这个问题
测试人员:
public class ClassroomTester extends ConsoleProgram
{
public void run()
{
Classroom c = new Classroom(2);
Student ada = new Student("Ada", "Lovelace", 12);
ada.addExamScore(44);
ada.addExamScore(65);
ada.addExamScore(77);
Student alan = new Student("Alan", "Turing", 11);
alan.addExamScore(38);
alan.addExamScore(24);
alan.addExamScore(31);
// add students to classroom
c.addStudent(ada);
c.addStudent(alan);
c.printStudents();
Student topStudent = c.getTopStudent();
System.out.println(topStudent);
}
}
# 1 楼答案
它应该抱怨,因为如果
getTopStudent()
中的for循环从未运行,topStudent
将保持未初始化状态。使用Student topStudent = null
# 2 楼答案
您可以假设学生数大于1,但编译器检测到学生数为0时,学生对象可能未初始化。因此,您编写的代码应该确保涵盖所有流
您可能应该有这样的代码