BigDecimal for Financial Calculations
Use BigDecimal to avoid floating-point precision errors in money and tax calculations.
BigDecimal for Financial Calculations
Floating-point types (double, float) cannot represent all decimal values exactly due to binary representation. For money and taxes, use BigDecimal.
The Floating-Point Problem
Binary floating-point introduces tiny rounding errors. In financial apps these errors accumulate and cause real bugs.
double price = 0.1 + 0.2;
System.out.println(price); // 0.30000000000000004 (WRONG!)
System.out.println(price == 0.3); // false
// Real bug: total never equals expected
double total = 0;
for (int i = 0; i < 10; i++) total += 0.1;
System.out.println(total); // 0.9999999999999999All lessons in this course
- The Math Class Essentials
- Integer Arithmetic & Overflow
- BigDecimal for Financial Calculations
- NumberFormat and printf