Question

How to replace a random word in a string with a random word from a list of words using Java

Answer 1

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Random;
import java.util.List;

public class ReplaceRandomWord {

    public static String replaceRandomWord(String text, List<String> replacements) {
        // Split the sentence into words
        List<String> words = new ArrayList<>(Arrays.asList(text.split(" ")));

        if (words.isEmpty() || replacements.isEmpty()) {
            return text; // nothing to do
        }

        Random rand = new Random();

        // Pick random index in the sentence
        int idx = rand.nextInt(words.size());

        // Pick a random replacement word
        String newWord = replacements.get(rand.nextInt(replacements.size()));

        // Replace it
        words.set(idx, newWord);

        // Rebuild the string
        return String.join(" ", words);
    }

    public static void main(String[] args) {
        String text = "The quick brown fox jumps over the lazy dog";
        List<String> replacementWords = Arrays.asList("c#", "c++", "java", "rust", "python");

        String result = replaceRandomWord(text, replacementWords);
        System.out.println(result);
    }
}

  
  
/*
run:
  
The quick brown rust jumps over the lazy dog
  
*/

 

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