import *;
import java.util.Vector;

public class ListOfNumbers {
    private Vector<Integer> victor;
    private static final int SIZE = 10;

    public ListOfNumbers () {
        victor = new Vector<Integer>(SIZE);
        for (int i = 0; i < SIZE; i++)
            victor.addElement(new Integer(i));//改i-2出现负数异常
    }
    public void writeList() {
        PrintWriter out = null;

        try {
            System.out.println("Entering try statement");
            out = new PrintWriter(new FileWriter("OutFile.txt"));
        
            for (int i = 0; i < SIZE; i++)
                out.println("Value at: " + i + " = " + victor.elementAt(i));//改i-2负数异常
        }
        catch (ArrayIndexOutOfBoundsException e) {
            System.err.println("Caught ArrayIndexOutOfBoundsException: " +
                                 e.getMessage());
        }
        catch (IOException e) {
            System.err.println("Caught IOException: " + e.getMessage());
        }
        catch(NegativeArraySizeException e ){
            System.err.println("Caught NegativeArraySizeException :"+e.getMessage());
        }
        catch(NullPointerException e){
            System.err.println("Caught NullPointerException :"+e.getMessage());
                }
        finally {
            if (out != null) {
                System.out.println("Closing PrintWriter");
                out.close();
            } else {
                System.out.println("PrintWriter not open");
            }
        }
    }
    public static void main(String [] args){
     ListOfNumbers num=new ListOfNumbers();
     num.writeList();
    }
}
问题：这四个异常代表的意思以及如何改动程序会使得IOException NullPointerException NegativeArraySizeException 异常出现？

怎么没人回啊？