import java.util.Scanner;
import java.text.*;
public class Main
{
    public static void main (String [] args)
    {
        Scanner kb = new Scanner (System.in);
        DecimalFormat df = new DecimalFormat("#.0000");
        int dem = 0;
        String inra;
        double [] data = new double [50000];
        while (kb.hasNextDouble())
        {
            data[dem] = kb.nextDouble ();
            dem++;
        }
        for (int i = dem-1; i >= 0; i--)
        {
            inra = df.format (Math.sqrt(data[i]));
            if (inra.charAt (0) == '.')
                inra = "0" + inra;
            System.out.println (inra);
        }

    }
}

I used
List<Double> = new ArrayList<Double>();

and it worked without crash.

----

public class Main
{
    public static void main (String [] args)
    {
...

        String inra;
        List<Double> coll = new ArrayList<Double>();

        while (kb.hasNextDouble())
        {
            coll.add(kb.nextDouble());
        }

        for(int j = coll.size() - 1; j >= 0; j--)
        {
            inra = df.format (Math.sqrt(coll.get(j)));
            if (inra.charAt (0) == '.')
                inra = "0" + inra;
            System.out.println (inra);
        }

    }
}

----

or following will work
double [] data = new double [140000];

Edited by author 25.01.2013 22:05

Edited by author 25.01.2013 22:05

Edited by author 25.01.2013 22:41

FUCK??????