代码79行一直提示数组越界异常，怎么回事 - 黑马程序员技术交流社区

import java.io.*;
import java.util.*;
//定义学生类
class Student implements Comparable<Student>
{
private String name ;
private int ma,cn,en;
private int sum;
Student (String name,int ma,int cn,int en )
{
this.name=name;
this.ma=ma;
this.cn=cn;
this.en=en;
sum=ma+cn+en;
}
public int compareTo(Student s )
{
int num = new Integer(this.sum).compareTo( new Integer (s.sum));
if(num==0)
return this.name.compareTo(s.name);
return num;
}
public String getName()
{
return name;
}
public int getSum()
{
return sum;
}
public int hashCode()
{
return this.name.hashCode()+sum*78;
}
public boolean equals (Object obj )
{
if(!(obj instanceof Student))
throw new ClassCastException("类型不匹配");
Student s = (Student ) obj;
return this.name.equals(s.name) && this.sum == s.sum ;
}
public String toString ()
{
return "Student ["+this.name+","+this.ma+","+this.cn+","+this.en+"]";
}
}
class StudentInfoTool
{
public static Set<Student> getStudents () throws Exception
{
BufferedReader bufr =new BufferedReader ( new InputStreamReader (System.in));
String line = null;
Set<Student> stus = new TreeSet<Student> ();
while((line = bufr.readLine())!=null)
{
if("over ".equals(line))
break;
String [] info =line.split(",");
Student stu = new Student (info[0],Integer.parseInt(info[1]),Integer.parseInt(info[2]),Integer.parseInt(info[3]));
stus.add(stu);
}
bufr.close();
return stus;
}
public static void writeToFile(Set<Student> stus) throws Exception
{
BufferedWriter bufw = new BufferedWriter ( new FileWriter ("stuentinfo.txt"));
for(Student stu : stus )
{
bufw.write(stu.toString ());
bufw.write(stu.getSum());
bufw.newLine();
bufw.flush();
}
bufw.close();
}
}
class StudentInfoTest
{
public static void main(String[] args) throws Exception
{
Set <Student> set= StudentInfoTool.getStudents ();
StudentInfoTool.writeToFile(set);
}
}

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