To become a java developer, what are the necessary things that I need to know?

Answer 1

Java: data structures, algoriths, clean code principles
Spring: spring core, boot, data jpa
Hibernate, rest

This is just standard technology stack for java developer.

Answer 2

Srivardhan Agarwal

Core Java
Multi Threading
Collection Framework
Networking

Advance Java like Spring Boot, Hibernate

Swing and Applets are outdated but you can learn.

Answer 3

1)Oracle
2)UML
3)SDLC concepts.

Answer 4

Dasarath Singh thanks

Answer 5

AJ #Infinity Love thanks.