Reputation: 2966
I'm trying to format a double to just 2 decimal places in Java.
I've read the following post: How to round a number to n decimal places in Java
For some reason, every one of those methods fails to work on certain numbers I have..
For example:
DecimalFormat df = new DecimalFormat("#.##");
normalizedValue = Double.valueOf(df.format(normalizedValue));
If I print normalizedValue
I get result similar to the following:
-78.64000000000001
18.97
59.469999999999985
-63.120000000000005
(Note: some are formatted correctly... some aren't)
So, these methods seem to round, but I need something that will remove all decimals after 2 decimal places... Any suggestions?
Thank you.
Upvotes: 0
Views: 2170
Reputation: 39197
The string representation given by DecimalFormat.format(...)
does indeed have only 2 digits in your example. But as soon as you reconvert it into a double those accuracy issues occur. A binary base format like double will always show such effects when you try to represent "exakt" decimal fractions. You may change to BigDecimal
to get rid of such effects.
Upvotes: 5