[javaIsGreat]

I think if you study the right materials and build projects for your resume its possible in 4 months.

Finding your first job will be tough, as you are competing with other developers who already have professional experience most likely, so just keep learning new technologies and building projects to improve your marketable skills.

I would reccomend reaching out to developers in your area to start conversations and ask for advice on what/where to learn.

That being said a year to become is a more realistic timeline.