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math. BigDecimal. doubleValue() is an in-built function which converts the BigDecimal object to a double. This function converts the BigDecimal to Double.
So, to obtain a double from a BigDecimal , simply use bd. doubleValue() . There is no need to use an intermediate string representation, and it can even be detrimental to do so, because if the string representation performs some rounding, you don't get the best approximation of the value in the BigDecimal .
A BigDecimal is an exact way of representing numbers. A Double has a certain precision. Working with doubles of various magnitudes (say d1=1000.0 and d2=0.001 ) could result in the 0.001 being dropped alltogether when summing as the difference in magnitude is so large. With BigDecimal this would not happen.
Convert the double to a BigDecimal, using rounding, and then use compareTo(). Note that equals() takes into account decimal positions, so compareTo() is safer. You may need to round the BigDecimal as well.
You need to use the doubleValue() method to get the double value from a BigDecimal object.
BigDecimal bd; // the value you get
double d = bd.doubleValue(); // The double you want
You can convert BigDecimal to double using .doubleValue(). But believe me, don't use it if you have currency manipulations. It should always be performed on BigDecimal objects directly. Precision loss in these calculations are big time problems in currency related calculations.
Use doubleValue method present in BigDecimal class :
double doubleValue()
Converts this BigDecimal to a double.
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