Proficiency in Java, huh? It's a great start. But, with respect, you should be prepared to tell your interviewers what you've done with it.
These days, lots of Java development is for "line-of-business" applications. Many of them are developed in-house for companies who sell products other than software. Those software projects often use database management systems along with Java. So, you might be wise to get yourself some JDBC and SQL chops to go with your Java skills for those jobs. Those projects are all about turning the company's data into useful actionable insights. So you need to be able to get to the company's data. SQL.
Android phone apps, at least some of them, are written in Java. Again, there are Android-specific skills you can add to Java to prepare for those jobs. Phone apps are about the user experience.
Over the span of your career, you can expect the programming language you use to change completely three or four times. So, whatever you do, don't decide you're a Java guy. Decide you're a skilled programmer who's capable of working with a variety of tools, and continually learning new tools.