Specialization

Hello guys,
What do you think about Specialization?
In my case, I’m so confused,i don’t know if i should learn some of advanced things in web development, desktop apps development, and android apps development …
Or Should Focus on one Programming language, or … really I’m in bad situation,
Btw i love Java.
Any help or opinions will be perfect.
Thank you

原文链接：Specialization