How to read a double value from a String with a certain precision (say 4) assuming the string contains something like “10.1234” using this api
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How to read a double value from a String with a certain precision (say 4) assuming the string contains something like “10.1234” using this api
If you want decimal precision,
doubleis the wrong target type, as it is a binary format that cannot accurately represent most round decimal fractions. Thatdoublevalue will actually be rounded to something like 10.123399999999999999976Instead, use
BigDecimalall the way, or forget about runding while you read and manipulate the data, and round it only when you print the result.Read The Floating-Point Guide for more information.