替换String数组中随机索引的单词百分比(Substituting percentage of words at random indexes in String array)

替换String数组中随机索引的单词百分比(Substituting percentage of words at random indexes in String array)

我有一个字符串

这是一个非常好的句子

我把它分成单独的单词并存储在String[]中：

String[] words = s.split(" ");

如何对单词总数采取特定的百分比（比如说6个单词中的2个），并用其他内容替换这2个单词。 我的代码到目前为止：

//Indexes in total int maxIndex = words.length; //Percentage of total indexes double percentageOfIndexes = 0.20; //Round the number of indexes int NumOfIndexes = (int) Math.ceil( maxIndex * (percentageOfIndexes / 100.0)); //Get a random number from rounded indexes int generatedIndex = random.nextInt(NumOfIndexes);`

I have a string like

This is a very nice sentence

I break it into separate words and store in String[] with:

String[] words = s.split(" ");

How can I take a specific percentage on the total number of words (lets say 2 of 6 words) and substitute these 2 words with something else. My code so far:

//Indexes in total int maxIndex = words.length; //Percentage of total indexes double percentageOfIndexes = 0.20; //Round the number of indexes int NumOfIndexes = (int) Math.ceil( maxIndex * (percentageOfIndexes / 100.0)); //Get a random number from rounded indexes int generatedIndex = random.nextInt(NumOfIndexes);`

最满意答案

首先，计算要替换的单词数：

int totalWordsCount = words.length; double percentageOfWords = 0.20; int wordsToReplaceCount = (int) Math.ceil( totalWordsCount * percentageOfWords );

然后，知道要替换多少个单词，获取那么多随机索引，然后在这些索引处交换单词：

for (int i=0; i<wordsToReplaceCount; i++) { int index = random.nextInt(totalWordsCount); //and replace words[index] = "Other"; // <--- insert new words }

注意：请记住，单词数量越少，您的百分比与要替换的实际单词数之间的差异就越大，例如。 6个单词中的20％是1.2个单词，在Math.ceil（）之后变为2，并且从6开始变为2的33.33％。

First, calculate how many words you want to replace:

int totalWordsCount = words.length; double percentageOfWords = 0.20; int wordsToReplaceCount = (int) Math.ceil( totalWordsCount * percentageOfWords );

Then, knowing how many words you want to replace, get that many random indexes, and just swap words at those indexes:

for (int i=0; i<wordsToReplaceCount; i++) { int index = random.nextInt(totalWordsCount); //and replace words[index] = "Other"; // <--- insert new words }

NOTE: Just remember that the smaller the number of words, the bigger discrepancy between your percentage, and actual number of words to replace, eg. 20% from 6 words is 1.2 word, which becomes 2 after Math.ceil(), and 2 is 33.33% from 6.