Why is it hard to learn java?

Answer 1

Becuse it's usefull

Answer 2

It's not just a complex language, there are many technologies, libraries, frameworks, tools - with which experience is required if you want to get a real job, and if you want to take a job interview, you need to know strange details.
Java is used for large projects where they do not need a person who knows little of the basic things about programming and Java.

Answer 3

it depends on the time dedicated and on what your heart says. if you really want to be a programmer and write all sorts of mindblowing cool programs, then you will learn it somehow.