will it b important for both web & app development ?

Question

Wanna learn java.

Answer 1

yes

Answer 2

it will be required in app dev. As far as web dev is concerned its unlikely especially in the front-end.

Answer 3

Being a universal and an OOP language, Java is a really useful langauge to learn, regardless of programming experience.
But if you want to develop web applications, you should also consider learning HTML, along with Javascript and CSS.