private final int accuracy; //精度，计算到小数点后几位，考虑到结果四舍五入要比设定精度高2位 private final BigDecimal accuracyNum; //=10 ...

Recommended for beginners: run git clone https://github.com/ByteLegendQuest/java-import-class to download the code, finish the challenge in your local IDE, then copy ...