文章目录
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1.当double得到NAN时加上验证DOUBLE.isNan(值)
double a = 0.0 0.0;
if (Double.isNaN(a)) {undefineda = 0.0;}

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2.当double得到INFINITY时加上验证DOUBLE.isInfinite(值)
double b = 0.0 / 0.0;
if (Double.isInfinite(b)) {undefinedb = 0.0;}