Java保留n位小数输出的几种方法

https://blog.csdn.net/qq_54334713/article/details/127825285?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-1-127825285-blog-114569689.235%5Ev43%5Econtrol&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-1-127825285-blog-114569689.235%5Ev43%5Econtrol&utm_relevant_index=2

https://segmentfault.com/q/1010000042942069/a-1020000042942071