Chapter 17 Exercise 5, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

17.5 (Store objects and arrays in a file)
Write a program that stores an array of the five int
values 1, 2, 3, 4, and 5, a Date object for the current time,
and the double value 5.5 into the file named Exercise17_05.dat.

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.Date;

public class Exercise_05 {

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

        int[] numbers = {1, 2, 3, 4, 5};
        try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("Exercise17_05.dat"))) {
            out.writeObject(numbers);
            out.writeObject(new Date());
            out.writeDouble(2.5);
        }

    }
}