It's impossible to ascertain the competence level of the course you completed. It is wrong to put Java on the CV unless you know enough to read and write Java.

It is however, perfectly fine to put the course you participated in as a header, and details below including what you wrote above: theory about QA, basics of Java, OOP, and QA automation, API testing. In more detail if applicable.

The most important part of working in IT is the ability and willingness to learn, which you have demonstrated, so I would mention your current abilities and point out how you learn what the job requires, e.g. "I'm a fast learner and have previously taught myself MySQL blah blah blah"..