Create a BigDecimale randomly

Question

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Generating random BigDecimal value from given range

How to create a lot of values BigDecimal randomly between 0 and 1 ?

http://stackoverflow.com/questions/5023421/generating-random-bigdecimal-value-from-given-range — Jean Logeart, May 10 '12 at 09:50
Does it make any sense to have a very accurate random number? — Peter Lawrey, May 10 '12 at 09:54
@Vakimshaar: The answer to the linked question is actually not very good. — jarnbjo, May 10 '12 at 09:59
@PeterLawrey perhaps, if one were simulating physical processes... but given the quality of the question I think that's unlikely... — mcfinnigan, May 10 '12 at 10:00
Why do you use BigDecimal? Do you actually need higher precision than what is given by a double? If so, do you want to specify the precision for each generated number or do you need a fixed precision? — jarnbjo, May 10 '12 at 10:01
@jarnbjo You are right, but one can actually jump from one link to an other! :) — Jean Logeart, May 10 '12 at 10:07

score 0 · Answer 1 · answered May 10 '12 at 09:48

0

Take a look at this JavaDoc. Once you have a numerical value for a lot, do a simple for loop and use the Random class to initialze random double values.

answered May 10 '12 at 09:48

npinti

51,780
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`Random` return only `flot`, `long`, `double` ... but not `BigDecimal` – Mehdi May 10 '12 at 09:50
It is a pity we do not force people who downvote to leave some sort of comment... – npinti May 10 '12 at 09:57
@user15992 It sounds like it would benefit you to spend a few minutes browsing the javadocs for the BigDecimal class. BigDecimal has several constructors, some of which take doubles as parameters. – mcfinnigan May 10 '12 at 09:57

score 0 · Answer 2 · answered May 10 '12 at 09:53

Try this code

class BigDecRand {
 public static void main(String[] args) {
    String range = args[0];
    BigDecimal max = new BigDecimal(range + ".0");
    BigDecimal randFromDouble = new BigDecimal(Math.random());
    BigDecimal actualRandomDec = randFromDouble.divide(max,BigDecimal.ROUND_DOWN);

    BigInteger actualRandom = actualRandomDec.toBigInteger();
 }

}

for more details

Copying code from a similar question and pretend it to be yours is perhaps not very polite? Except for that, if the poster really wants a BigDecimal, I would assume that he needs higher precision that what this answer will give him. — jarnbjo, May 10 '12 at 09:57

Create a BigDecimale randomly

2 Answers2