Matching Excel's floating point in Java

Question

I have an .xlsx spreadsheet with a single number in the top-left cell of sheet 1.

The Excel UI displays:

-130.98999999999

This is v

Answer 1

You need to use BigDecimal for this (for not losing any precision).
E.g. read the value as a String, then construct a BigDecimal from it.

Here is an example where you don't lose any precision i.e. this
is the way to obtain exactly the same number which the user sees in Excel.

import java.math.BigDecimal;

public class Test020 {

    public static void main(String[] args) {
        BigDecimal d1 = new BigDecimal("-130.98999999999069");
        System.out.println(d1.toString());

        BigDecimal d2 = new BigDecimal("10.0");

        System.out.println(d1.add(d2).toString());
        System.out.println(d1.multiply(d2).toString());
    }

}