Java is one of the fastest-growing programming languages of all time. Hence, to grow as a freelance Java developer, you should be adept with the basic and advanced Java skills. You can develop and polish your skills by practice. For this, you need continuous practice that is possible by undertaking various projects that will give you a taste of all skill sets in Java. You can refer to the Eiliana website and you will get many Java-related projects for your freelancing.
The basic or primary level Java skill set includes:
Knowledge of Object-Oriented Programming Languages
Knowledge about Java frameworks like Struts and Spring
Know how to write classes, functions, and objects
JSON and XML
Arrays, Lists, Maps, Graphs, etc.
JDE (Java Development Environment)
JVM (Java Virtual Machine)
JRE (Java Runtime Environment)
JDK (Java Development Kit)
If you want to become a pro-Java Developer or Engineer, you need more than basic Java skills.You need to increase your learning rate and learn advanced or secondary Java skills. That includes: