如何将大数从一个基数转换为另一个基数 [英] How to convert big numbers from one base to another

问题描述

我正在尝试将SQL函数转换为Groovy以便在Elasticsearch中使用，但是我仍然停留在这个阶段.考虑到我一生中从未接触过Java或Groovy，我在做什么错了?

I am trying to convert a SQL function into Groovy for usage in Elasticsearch, but I am stuck at this stage. Considering, I have never touched java or groovy in my life, what am I doing wrong?

代码

public String convertFromBaseToBase(String str, int fromBase, int toBase) {
    return Integer.toString(Integer.parseInt(str, fromBase), toBase);
}

output = convertFromBaseToBase("8f8f87878f8f8080", 16, 10);

System.out.print(output);

来自在Java中从一个基础转换为另一个基础

错误

java.lang.NumberFormatException:对于输入字符串:"8f8f87878f8f8080"
在java_lang_Integer $ parseInt.call(未知来源)
在Script1.convertFromBaseToBase(Script1.groovy:2)
在Script1.run(Script1.groovy:5)

java.lang.NumberFormatException: For input string: "8f8f87878f8f8080"
at java_lang_Integer$parseInt.call(Unknown Source)
at Script1.convertFromBaseToBase(Script1.groovy:2)
at Script1.run(Script1.groovy:5)

推荐答案

8f8f87878f8f8080是一个非常大的数字(十进制10344635885392199808)，并且不适合Integer内.

8f8f87878f8f8080 is a very big number (10344635885392199808 in decimal), and will not fit inside an Integer.

对于如此大的数字，您将不得不使用BigInteger.

You will have to use BigInteger for such big numbers.

public static String convertFromBaseToBase (String str, int fromBase, int toBase){
  return (new BigInteger(str, fromBase)).toString(toBase);
}

工作代码--> https://www.onlinegdb.com/B1mMEcKPX

BigInteger --> https://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html#toString(int)

BigInteger -->https://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html#toString(int)

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