WriteToFile.java

package FileWriter;

import java.io.PrintStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.Random;

public class FileWriter {

    public static void main(String[] args) throws FileNotFoundException {
        PrintStream writer = new PrintStream(new File("randInts.txt"));

        Scanner scanner = new Scanner(System.in);
        System.out.print("How many digits?: ");
        int numberOfDigits = scanner.nextInt();

        Random random = new Random();
        for (int counter = 0; counter < numberOfDigits; counter++) {
            writer.print(random.nextInt(10));
        }
    }
}