calculates average user input in java. must be between 2 and 25 values.

average user input

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

public class AverageNumber {

	public static void main(String[] args) {
		AverageNumber ave = new AverageNumber();
		try {
			ave.calculateUserInputAverage();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	protected void calculateUserInputAverage() throws IOException {
		System.out.println("Please input 2 to 25 numbers, enter will exit.");
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

		String s = null;
		List<Float> input = new ArrayList<Float>();
		while (input.size() < 25) {
			s = in.readLine();
			if (s.length() > 0)
				try {
					input.add(new Float(s));
				} catch (NumberFormatException e) {
					System.out.println("Unable to parse value as a number, please try again.\n");
				}
			else if (input.size() > 1)
				break;
			else
				System.out.println("Please enter more than two numbers.\n");
		}
		System.out.println("Average: " + calculateAverage(input));
		System.out.println("input: " + input.toString());
	}

	private String calculateAverage(List<Float> input) {
		float sum = 0;
		for (Float nbr : input) {
			sum += nbr.floatValue();
		}
		return String.valueOf(sum/input.size());
	}

}