How I generate arrays for semester work

InputGenerator.java

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;

public class InputGenerator {

    public static void main(String[] args) throws IOException {
        Random random = new Random();

        int[] fileSizes = new int[random.nextInt(50) + 50];
        for (int i = 0; i < fileSizes.length; i++) {
            fileSizes[i] = random.nextInt(100_000) + 100;
        }

        FileWriter fileWriter;

        for (int i = 0; i < fileSizes.length; i++) {
            File file = new File("./res/file" + i + ".txt");

            file.createNewFile();
            fileWriter = new FileWriter(file);

            for (int j = 0; j < fileSizes[i]; j++) {
                fileWriter.write(String.valueOf(random.nextInt()) + " ");
            }
            fileWriter.close();
        }
    }

}

this saved my life