BigDecimal Java Operations Guide

In Java, the BigDecimal class offers precise number calculations, avoiding the issue of precision loss with floating-point numbers. The rules for performing operations with BigDecimal are as follows:

1. Addition: perform addition operation using the add method.
2. Subtraction: Perform subtraction using the subtract method.
3. Multiplication: Perform multiplication operations using the multiply method.
4. Division: perform division operation using the divide method, and have the option to specify the number of decimal places to keep and the rounding rule.
5. 余数：利用remainder方法获得两个数相除后的剩余部分。
6. Comparison: Using the compareTo method for comparison operations, returning -1 indicates less than, 0 indicates equal, and 1 indicates greater than.
7. Precision setting: You can use the setScale method to determine the number of decimal places to keep and the rounding rule.

Using the BigDecimal class for numerical calculations can prevent inaccurate results due to floating point precision issues. Therefore, especially in scenarios requiring precise calculations, it is recommended to use the BigDecimal class for numerical operations.