this is my program, it can't be easier i think so, but i'm a new Java programmer, this is my program, please help to make it work faster!
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.*;
public class isquaresol {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        double a[] = new double[150000];
        int i = 0;
            for (; ;)
            {
                a[i] = Math.sqrt(input.nextDouble());
                i++;
                if (! input.hasNext()) break;
            }

        for (int j = i - 1; j >= 0; j--)
        {
            System.out.format("%.4f%n", a[j]);
        }
    }

}