存储比Java中的long类型长的数字 [英] Store a number that is longer than type long in Java

问题描述

如何在Java中存储比长类型(MAX:9223372036854775807)长的数字?

How can I store a number that is longer than the long type (MAX: 9223372036854775807) in Java?

例如，编号为9223372036854775820.

For example the number 9223372036854775820.

谢谢.

推荐答案

如果使用长整数，则使用 BigInteger ；如果使用浮点数，则使用 BigDecimal . BigInteger 可以随心所欲，直到没有足够的RAM.

Use BigInteger if you work with a long and use BigDecimal if you work with floatingpoint numbers. The BigInteger can be as big as you want, till there is not enough RAM.

示例:

    BigInteger bd = new BigInteger("922337203685477582012312321");
    System.out.println(bd.multiply(new BigInteger("15")));
    System.out.println(bd);

输出:

13835058055282163730184684815
922337203685477582012312321

但是必须使用 BigInteger 方法进行计算，在该示例中，您看到 BigInteger 是不可变的.

But have to use the BigInteger methods to do calculations and in the example you see that BigInteger is immutable.

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