How to avoid rounding off large Double values?

For converting from String to Double, consider a piece of code as below:
String str = "999999999999999.99999";
Double d = Double.valueOf( str );In this case, d will contain the value 1E15 and not 999999999999999.99999.
Is there any way by which we can avoid this rounding off?
TIA,
Ninad.

> String str = "999999999999999.99999";Note that you have a total of 20 decimal digits here.
A double only has 53 bits to represent the mantissa
so it can only accurately represent about 16 decimal digits.

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