Financial operation.

I'm wondering about mapping type for ammount money in database defined as
numeric(10,2).
I have two option:

1. Mapping to BigDecimal

2. Maping to Double
In this case I'd like move access type to field and give
Long getter and setter in which is doing appropriate conversion from/to Double (with multiply/ divide 100):

//return salary in cent
public Long getSalary() {
return Util.getAsLong(amount);
}

public void setSalary(Long ammount) {
this.amount = Util.getAsDouble(amount);
}
In this case all financial operation are doing on Long (cents).


I know that using BigDecimal is comfortable solution buy not most efficient and fast.
What do you think about solution witch Double ?
What are you using for financial operations ?

Thanks in advance
gienas

Use BigDecimal or use Long for cents. I think using Double for financial data is a very, very bad idea. Efficiency is far less important than correctness in finance, no?

In fact, using wrong constructor of BigDecmial is a typical mistake that Java Programmers make. BigDecimal has overloaded constructor and if you use the one which accept double as argument you will get same result as you do while operating with double. So always use BigDecimal with String constructor. Here is an example of using BigDecmial constructed with double values:

//Creating BigDecimal from double values
BigDecimal amount3 = new BigDecimal(2.15);
BigDecimal amount4 = new BigDecimal(1.10) ;
System.out.println("difference between 2.15 and 1.0 using BigDecmial is: " + (amount3.subtract(amount4)));

Output:
difference between 2.15 and 1.0 using double is: 1.0499999999999998
difference between 2.15 and 1.0 using BigDecmial is: 1.049999999999999822364316059974953532218933105468750