Java - What Should I Learn Next?

Java - What Should I Learn Next?

Well, I've been trying to teach myself Java. I'm really at a place now
where I'm stumped. I basically don't know where to go/what to learn next.
I know 'if/else statements' 'strings,ints,floats' 'loops' - I can
basically do the very basic stuff in console.
I don't know what to learn next though? Arrays? I want to learn more, but
don't know what. I'm trying to expand OUT of console, would arrays be the
place to go?
Thanks