How to transfer the result of a double calculation to an understandable format?

Question

Java

In general, the essence of the question is as follows
============================
input data Double
numbers
20 000 000 total amount
3333333.33 VAT from the amount
=== =========================
Processing
20 000 000 - 3333333.33 amount without VAT
================ ============
result
1.666666667E7
As in the calculator,
my expectations User-friendly format
16 666 666.7
Prompt class for mathematical calculations in java

Answer 1

Google formatted number output.

Answer 2

Big Decimal helped