toPlainString, toEngineeringString, toString for BigDecimal in Java

Little scum · Posted on 3/26/2025 2:21:51 PM

When printing with java.math.BigDecimal, we are often curious about the conversion strings provided by BigDecimal.

stripTrailingZeros(): Removes all zeros at the decimal tail and returns a BigDecimal type of data, which is not guaranteed to be scientific notation
toPlainString(): No exponents used (never scientific notation)
toString(): Use scientific notation when necessary
toEngineeringString(): Use engineering counters when necessary. Engineering notation is a method of recording numbers often used in engineering calculations, similar to scientific notation, but requires that the power of 10 must be a multiple of 3

No exponents are used	Scientific notation method	Engineering notation method
0.0001	0.0001	0.0001
0.0000001	1E-7	100E-9

Code:

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[Source] toPlainString, toEngineeringString, toString for BigDecimal in Java