Question

please code in java:

There's an arraylist of "words" with 250,000 words. Pick 50,000 randomly chosen words from "words" and add them to a "search" array (not Arraylist) of strings.

Answer 1

Thanks for the question, selecting 50,000 words from 250,000 words is like selecting 1 word for every 5 words.

We can divide the 250,000 words into 50,000 groups where each group contains 5 words, and then selecting one word from each group.

First group starts with index 0 and ends with index 4
Second group starts with index 5 and ends with index 9
...
...

Likewise and so forth.

Below is the code that you will be needing. Let me know for any questions or help.


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import java.util.ArrayList;
import java.util.Random;

public class RandomSearchWords {

    public static void main(String[] args) {

        ArrayList<String> words = new ArrayList<>(250000);
        Random random = new Random();

        String search[] = new String[50000];
        int index = 0;
        int randomIndex = 0;
        for (int i = 0; i < search.length; i++) {
            randomIndex = i * 5 + random.nextInt(5);
            search[i] = words.get(randomIndex);
        }

    }
}

==========================================================================

thanks !