cast Double to String in java

Double to String casting …
if you want to display its String in number format (like this ###,###,##0.00) do not use these lines …

    Double sk = 12300000000.35;
    System.out.println(sk.toString());
    System.out.println(String.valueOf(sk));

they would result like these ones:

1.230000000035E10
1.230000000035E10


use this one instead.

    Double sk = 12300000000.35;
    NumberFormat nm = NumberFormat.getNumberInstance();

    System.out.println(nm.format(sk));

the latter result would be this:
12.300.000.000,35