I think you can look around there and don't believe the recommendation above. It's basically thanks. If you are engaged in this job, you don't need to attend classes. Buy a book, you can read it yourself. JAVA itself is still very easy to learn, encapsulating a lot of things and actually writing very little. The development cycle is also relatively fast.

Ask your classmates if they can learn anything, how teachers are like, and how students used to get jobs, so that you can know if a training institution has real strength! I strongly suggest you ask yourself and don't trust anyone.