Java中的大数 [英] Large Numbers in Java

问题描述

如何在 Java 中进行非常大的数字计算?

How would I go about doing calculations with extremely large numbers in Java?

我已经尝试过 long，但它的最大值为 9223372036854775807，当使用整数时，它不能保存足够的数字，因此对于我的需要来说不够准确.

I have tried long but that maxes out at 9223372036854775807, and when using an integer it does not save enough digits and therefore is not accurate enough for what I need.

这里面还有吗?

推荐答案

您可以将 BigInteger 类用于整数，BigDecimal 用于带有小数位的数字.这两个类都定义在 java.math 包中.

You can use the BigInteger class for integers and BigDecimal for numbers with decimal digits. Both classes are defined in java.math package.

例子:

BigInteger reallyBig = new BigInteger("1234567890123456890");
BigInteger notSoBig = new BigInteger("2743561234");
reallyBig = reallyBig.add(notSoBig);

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