NumberFormatException onBufferedReader to read doubles into ArrayList.

Hello peeps. I'm new to bufferedreader. I'm using it instead of scanner because my program has to save on memory. But it seems like a headache. What I'm trying to do is read in a line of doubles.. I have to all the doubles. from one line. I cannot read then read again. I'm getting a numberFormatException but I can't seem to point it out. Here's the exact error:

java.lang.NumberFormatException: For input string: "100 2 20 2"
	at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
	at java.lang.Double.parseDouble(Unknown Source)
	at Internship.main(Internship.java:29)
[/coder]


I can't seem to point out why. It seems like a legal move to read in a string, then parse it to a double.
[code]
import java.io.BufferedReader;
import java.io.IOException;
import java.util.ArrayList;
import java.io.InputStreamReader;

/**
 * 
 * 
 * Written 12/26/2012
 */


public class Internship {
	
	
	public static void main(String[] args) throws IOException{
		
		double denomenator = 0.0,  numerator = 0.0, probability = 0.0, pEntered = 0, winners = 0, tickets = 0, pGroup = 0;
		BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
		
		//Array list to hold values.
		ArrayList<Double> lotteryInput = new ArrayList<Double>();


		System.out.println("Enter nubmers");
		//Add values entered from input stream to arraylist
		for(int i = 0; i < 4 ; i++){
			try {
				lotteryInput.add(Double.parseDouble(r.readLine()));
			} catch (NumberFormatException e) {
				e.printStackTrace();
			}
	
		}
		r.close();