intermediateJava Basics & OOP
Why should you never use double for financial calculations?
Binary floating point can't represent most decimal fractions exactly — `0.1 + 0.2` prints `0.30000000000000004`. Use BigDecimal with the String constructor (`new BigDecimal("0.1")`, never the double constructor) for exact decimal arithmetic; it's 5-10x slower but correctness matters more for money.
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