Java源码解读 – 常量52429 | KAAAsS's blog



Java源码解读 – 常量52429 | KAAAsS's blog

固定的形式是一个整型变量乘上52429，然后向右移19位。很自然想到2^19=524288，那么这个52429就不难理解了，应该就是除10的操作。除法是很慢的，而乘法和以为却相对较快，所以为了优化这一点点的速度，java采用了乘52429再移19位的方法。对于为什么选择52429，这里列出几个取值的精度：


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