为什么会出这个出现这个越界异常现象..... - 黑马程序员技术交流社区

import java.io.*;
import java.util.*;
class getStudentInfoDemo
{
public static void main(String[] args)
{
Comparator<Student> cmp = Collections.reverseOrder();
Set<Student> stus = infoTool.getStudentSet(cmp);
File f = new File("r:\\1.txt");
infoTool.writeInfo(stus,f);
}
}
class Student implements Comparable<Student>//学生类
{
private String name;
private int cn,ma,en;
private int sum;
Student(String name, int cn, int ma,int en)
{
this.name = name;
this.cn = cn ;
this.ma = ma ;
this.en = en ;
getSum() ;
}
public String getName()
{
return name;
}
public int getSum()
{
return sum = cn + ma + en ;
}
public String toString()
{
return "学生:{\t"+name+",\t语文"+cn+",\t数学"+ma+",\t英语"+en+"\t}"+"总分"+sum;
}
public int hashCode()
{
return name.hashCode()+sum*17;
}
public boolean equals (Object obj)
{
if(!(obj instanceof Student))
throw new ClassCastException("输入的类型不是学生类");
Student s = (Student)obj;
return this.name.equals(s.name) && this.sum == s.sum ;
}
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;
}
}
class infoTool//工具类
{
public static Set<Student> getStudentSet(Comparator<Student> cmp)//获取集合的
{
System.out.println("请输入学生的姓名和语文,数学,英语成绩,例如(张三,60,60,60)");
BufferedReader buffr = null;
Set<Student> stuSet = new TreeSet<Student>(cmp);
try
{
buffr = new BufferedReader(new InputStreamReader(System.in));
String line = null;
while((line=buffr.readLine())!=null)
{
if(line.equals("over"))
break;
String[] arr = line.split(",");
Student stu = new Student(arr[0],Integer.parseInt(arr[1]),Integer.parseInt(arr[2]),Integer.parseInt(arr[3]));
stuSet.add(stu);
}
return stuSet;
}
catch (IOException e)
{
throw new RuntimeException("输入信息失败");
}
finally
{
try
{
if(buffr!=null)
buffr.close();
}
catch (IOException e)
{
throw new RuntimeException("关闭失败");
}
}
}
public static void writeInfo(Set<Student> s , File f)//写入文件的
{
BufferedWriter buffw = null;
try
{ buffw = new BufferedWriter(new FileWriter(f));
for(Student stu : s)
{
buffw.write(stu.toString());
buffw.newLine();
buffw.flush();
}
}
catch (IOException e)
{
throw new RuntimeException("输出信息失败");
}
finally
{
try
{
if(buffw!=null)
buffw.close();
}
catch (IOException e)
{
throw new RuntimeException("关闭失败");
}
}
}
}
//就连续按了2下回车就出异常的了功能是能正常的....

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