Even with competition from new languages, the demand for Java developers also remains strong. In fact, Java is among the most in-demand programming languages on the job market, depending on whose numbers you look at. Java developers are reported to have the lowest career switch rate of any profession. It’s a great basis for a steady career. Let's first look at the list of basic Skills for Java Developer. List of Basic Skills for Java Developer However, this isn’t a complete list, below is a list at some of the basic skills needed to become a Java developer: Core Java with Java 8 new features (especially Lambda expression) Object-oriented programming (OOP) concepts and some common design patterns Abstract classes and interfaces Constructors