I am new to the Java world and am trying to learn how to use BigDecimal. What I am trying to do now is limit the number of decimal places in a division problem. My line of code is:
quotient=one.divide(x);
Where quotient, one and x are all of type BigDecimal. I cannot figure out, however, how to limit the number of decimal places to print out, saying that x is some large number, and one is equal to 1. All help is appreciated, thanks!
That code will die a horrible death if the division has a non-terminating decimal expansion. See javadoc of divide(BigDecimal divisor)
:
if the exact quotient cannot be represented (because it has a non-terminating decimal expansion) an
ArithmeticException
is thrown.
Example:
BigDecimal one = BigDecimal.ONE;
BigDecimal x = BigDecimal.valueOf(7);
one.divide(x); // throws java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result.
Use one of the other overloads of divide()
, eg divide(BigDecimal divisor, int scale, RoundingMode roundingMode)
:
BigDecimal one = BigDecimal.ONE;
BigDecimal x = BigDecimal.valueOf(7);
BigDecimal quotient = one.divide(x, 5, RoundingMode.HALF_UP);
System.out.println(quotient); // prints: 0.14286
BigDecimal one = BigDecimal.ONE;
BigDecimal x = BigDecimal.valueOf(7);
BigDecimal quotient = one.divide(x, 30, RoundingMode.HALF_UP);
System.out.println(quotient); // prints: 0.142857142857142857142857142857
To set the number of decimal places in a variable BigDecimal you can use the following sentences depend that you want achieve
value = value.setScale(2, RoundingMode.CEILING)
to do 'cut' the part after 2 decimals
or
value = value.setScale(2, RoundingMode.HALF_UP)
to do common round
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