FAQ: Serialization: Lesson - Serializing Objects to a File

This community-built FAQ covers the “Serializing Objects to a File” exercise from the lesson “Serialization: Lesson”.

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This exercise can be found in the following Codecademy content:

[BETA] Learn Intermediate Java

FAQs on the exercise Serializing Objects to a File

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This course is a little rough. (The beginner Java course is much more polished. I didn’t have any problem with anything not working as described.) The article on using the command line where we built the Transportation set of files does not compile as written.

This particular exercise says a cars.txt file will appear but it did not for me. I’m pretty sure I’ve done it correctly.


What I didn’t get is this, will Java create a .txt file with the specified name if no such file exists? Suppose there’s no file named cars.txt. Would this line cause problems during compiling?

FileOutputStream fileOutputStream = new FileOutputStream("cars.txt");

And if FileInputStream/FileOutputStream doesn’t create files, then how do I do it with Java code?

I had the same bug, cars.txt didn’t appeared in the folder. Solved adding the constructor that was missing.

public Car(String make, int year) {
this.make = make;
this.year = year;


It’s been a year and this issue still exists. This course definitely needs revisiting and more polishing.

Adding a constructor for the Car class will fix this issue.

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