如何在 Java 中实现无穷大?

How to implement infinity in Java?(如何在 Java 中实现无穷大?)

问题描述

Java 是否有任何东西可以表示每种数值数据类型的无穷大?它是如何实现的，以便我可以用它进行数学运算?

Does Java have anything to represent infinity for every numerical data type? How is it implemented such that I can do mathematical operations with it?

例如

int myInf = infinity; //However it is done
myInf + 5; //returns infinity
myInf*(-1); //returns negative infinity

我尝试过使用非常大的数字，但我想要一个合适的简单解决方案.

I have tried using very large numbers, but I want a proper, easy solution.

推荐答案

double 支持 Infinity

double supports Infinity

double inf = Double.POSITIVE_INFINITY;
System.out.println(inf + 5);
System.out.println(inf - inf); // same as Double.NaN
System.out.println(inf * -1); // same as Double.NEGATIVE_INFINITY

打印

Infinity
NaN
-Infinity

注意:Infinity - Infinity 不是数字.

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