Question 16

package com.udayankhattry.ocp;
 
import java.io.*;
import java.util.List;
import java.util.Optional;
 
public class Test {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        var optional = Optional.of(List.of("O", "N"));
        try (var oos = new ObjectOutputStream(new FileOutputStream(("F:\\data.ser")));
             var ois = new ObjectInputStream(new FileInputStream("F:\\data.ser")))
        {
            oos.writeObject(optional);
 
            var object = (Optional<?>)ois.readObject();
            System.out.println(object.get());
        }
    }
}