Extract number decimal in BigDecimal

Question

How to extract a number after the decimal point using BigDecimal ?

BigDecimal d = BigDecimal.valueOf(1548.5649);

result : extract only : 5649

Solution 1

Try:

BigDecimal d = BigDecimal.valueOf(1548.5649);
BigDecimal result = d.subtract(d.setScale(0, RoundingMode.FLOOR)).movePointRight(d.scale());      
System.out.println(result);

prints:

5649

Solution 2

Try BigDecimal.remainder:

BigDecimal d = BigDecimal.valueOf(1548.5649); 
BigDecimal fraction = d.remainder(BigDecimal.ONE);
System.out.println(fraction);
// Outputs 0.5649

Solution 3

This should do the trick:

d.subtract(d.setScale(0, RoundingMode.FLOOR));

setScale() rounds the number to zero decimal places, and despite its name, does not mutate the value of d.

Solution 4

If the value is negative, using d.subtract(d.setScale(0, RoundingMode.FLOOR)) will return a wrong decimal.

Use this:

BigInteger decimal = 
                d.remainder(BigDecimal.ONE).movePointRight(d.scale()).abs().toBigInteger();

It returns 5649 for 1548.5649 or -1548.5649

View more solutions

Comments

[Mehdi]

it's display : 1548.564900000000079671735875308513641357421875

[Mehdi]

it return a same number : 1548.5649

[BetaRide]

This works only for a Locale that uses . as the decimal separator. But there are Locales which are using ,.

[JB Nizet]

@BetaRide: I know that, I'm French speaking, and the comma is used here. But BigDecimal.toPlainString() is not locale-aware. It uses the dot as decimal separator whatever the locale is.

[diego matos - keke]

As in other topics the result should be "5649" not "0.5649" , this is not the correct answer