Add elements to a dynamic two dimensional arraylist

See more:

Java

Hi, I want to check an array's elements, if it smaller than 200 or lager than 800, it will add to array 1, and others will be added to array 2, array 1 and array 2 will be in a two dimensional arraylist, anyway it looks like this:

int[] arr = {171,100,809,70,365,239,37,821,791,452,349};

result:

result[0] = {171,100,809,70,37,821}
result[1] = {365,239,791,452,349}


And here is my code:

import java.util.ArrayList;

public class twoDimen {

	public static void main (String[] args){
		int[] arr = {171,100,809,70,365,239,37,821,791,452,349};
		ArrayList<ArrayList<Integer>> result = new ArrayList<ArrayList<Integer>>();
		
		for (int i = 0; i <= arr.length; i++){
			if (arr[i] < 200 || arr[i] > 800){
				result.get(0).add(arr[i]);
			}
			else
				result.get(1).add(arr[i]);		
		}
		
		System.out.println(result.get(0));
		System.out.println(result.get(1));
	}	
}

it does not show any errors before I execute it, but there's errors when executing it:
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at twoDimen.main(twoDimen.java:11)

How can I fix it? And can I use dynamic two dimensional arrays instead of arraylist?

Thanks anyone's help.