如何快速将大型txt文件加载到BigInteger中？ [英] How can I quickly load a large txt file into BigInteger?

问题描述

我正在导入一个大文本文件， 1700万位长我正在使用此代码：

I'm importing a large text file, 17 million digits long and I'm using this code:

BufferedReader reader = new BufferedReader(new FileReader("test2.txt"));
String line = reader.readLine();
System.out.println("Done");
BigInteger num = new BigInteger(line);
System.out.println("Done Again");

它立即加载文件并打印出'完成'但要将 String 转换为 BigInteger ，有什么我可以做的吗加快速度并快速加载数字？

It loads the file pretty much instantly and prints out 'Done' but it takes a long time (about an hour) for the String to be converted into a BigInteger, is there anything I can do to speed this up and quickly load the number?

推荐答案

作为优化，因为 BigInteger Serializable ，您可以将其保存到二进制文件一次，并大大加快您的加载速度。

As an optimization, since BigInteger is Serializable, you could save it to a binary file once and speed up your loading considerably.

加载序列化对象应该是紧固 r，而不是每次解析一个巨大的字符串。

Loading a serialized object should be way faster than parsing a huge string everytime.

使用 ObjectOutputStream 您的大整数和 ObjectInputStream 将其重读。

Use ObjectOutputStream to save your big integer and ObjectInputStream to read it back in.

这篇关于如何快速将大型txt文件加载到BigInteger中？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！