为什么有两个例外___急

报什么错误呀？你的这个程序那天好像谁问过，我还回答了，代码在下面，你Copy过去就可以运行的，没有错误。
import java.io.*;
import java.util.*;public class TestScore {
  public TestScore() {
    LinkedList list=initialize();
    writeScore("C:\\score.ser",list);
    LinkedList list2= restoreScore("C:\\score.ser");
    displayScore(list2);
  }  public LinkedList initialize(){
    LinkedList link=new LinkedList();
    StudentScore s1=new StudentScore("Chinese","abu",90);
    link.add(s1);
    s1=new StudentScore("Math","abu",91);
    link.add(s1);
    s1=new StudentScore("English","abu",92);
    link.add(s1);
    s1=new StudentScore("Chemical","abu",93);
    link.add(s1);    return link;
  }  public void writeScore(String fileName, LinkedList list)
  {
    try
    {
      FileOutputStream fout = new FileOutputStream(fileName);
      ObjectOutputStream oout=new ObjectOutputStream(fout);
      oout.writeObject(list);
      fout.close();
    }
    catch(Exception e)
    {
      e.printStackTrace();
    }
  }
  public LinkedList restoreScore(String fileName)
  {
    LinkedList link=null;
    try
    {
      FileInputStream fin=new FileInputStream(fileName);
      ObjectInputStream oin=new ObjectInputStream(fin);
      Object obj=oin.readObject();
      link=(LinkedList)obj;
    }
    catch(Exception e)
    {
      e.printStackTrace();
    }
    return link;
  }  public void displayScore(LinkedList list)
  {
    Iterator iter=list.iterator();
    while(iter.hasNext())
    {
      StudentScore ss=(StudentScore)iter.next();
      System.out.println(ss.getStudentID()+"'s "+ ss.getCourseName()+" Score is:"+ss.getScore());
    }  }
  public static void main(String[] args) {
    TestScore testScore1 = new TestScore();
  }}class StudentScore implements Serializable
{
  private String courseName, studentID;
  private int score;  public StudentScore(String courseName, String studentID,int score)
  {
    this.courseName=courseName;
    this.studentID=studentID;
    this.score=score;
  }  public String getCourseName()
  {
    return this.courseName;
  }
  public String getStudentID()
  {
    return this.studentID;
  }
  public int getScore()
  {
    return this.score;
  }
}