Chapter 17 Exercise 2, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

17.2 (Create a binary data file)
Write a program to create a file named Exercise17_02.dat
if it does not exist. Append new data to it if it already exists.
Write 100 integers created randomly into the file using binary I/O.

import java.io.*;

public class Exercise_02 {

    public static void main(String[] args) throws IOException {

        File file = new File("Exercise17_02.dat");
        boolean append = file.exists();

        try (DataOutputStream out =
                     new DataOutputStream(
                             new BufferedOutputStream(
                                     new FileOutputStream(file, append)))) {

            for (int i = 0; i < 100; i++) {
                out.writeInt((int)(Math.random() * (Integer.MAX_VALUE + 1L)));
            }
        }

    }
}