BigDecimal上有Square Root的库吗？ [英] Are there libraries for Square Root over BigDecimal?

问题描述

Java中BigDecimal的Square Root是否有任何库？

Are there any libraries for Square Root over BigDecimal in Java?

推荐答案

JScience v4.3.1 有 Real 类似乎相当于 BigDecimal ，这可能对您有所帮助。使用示例：

JScience v4.3.1 has a Real class which seems to be the equivalent of BigDecimal and that might help you. An example of usage:

// The Square Root of Two, to 30 digits
// According to "The Square Root of Two, to 5 million digits."
// Source: http://www.gutenberg.org/files/129/129.txt
System.out.println("1.41421356237309504880168872420");

// Using JScience with 50 digits precision
Real.setExactPrecision(50);
System.out.println(Real.valueOf(2).sqrt());

// Using default java implementation
System.out.println(Math.sqrt(2));

> 1.41421356237309504880168872420
> 1.414213562373095048801689
> 1.4142135623730951

编辑：更新了代码和链接以反映当前版本当时（v4.3.1）。根据@ile和@Tomasz的评论，谢谢。

Edit: Updated the code and the links to reflect the current version at the time (v4.3.1). Based on @ile an @Tomasz comments, thanks.

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