我收到了一个未报告的异常；必须在下面的fill方法中被捕获或声明为抛出错误。从我读过的类似文章中，我假设错误是由read方法引发Exception引发的，但我无法修复。

public void read(int fileName)  throws Exception 
{
    FileInputStream in = null;

    try 
    {
        Scanner in = new Scanner("dataset.txt");
        File inFile = new File(in.nextLine());
        in = new FileInputStream(inFile);

    } 
    catch ( Exception e) 
    {
        System.out.println(e);
    }

    BufferedReader buf = new BufferedReader(new InputStreamReader(in) );

    String input;
    input = buf.readLine(); 
    fill(input,buf);
}

填充定义为：

public void fill(String in,BufferedReader buf) 
{
    StringTokenizer token = new StringTokenizer(input); 
    no = token.countTokens();

    constraints = new Vector[noOfAttributes]; 
    for (int i=0; i < no; i++) 
    {
        c[i] = new Vector(); 
        names = new String[noOfAttributes];
    }

    for (int i=0; i < no; i++) 
    {
        names[i]  = token.nextToken();
    }

    while((in = buf.readLine()) != null) //<----error given here
    { 
        token = new StringTokenizer(input);
        Train example = new Train(no);

    }
    buffer.close();
}