In this video, Haythem Balti from the Wiley Edge Academy explains 5 Java fundamentals you need to know for the interview. Here's what he had to say:
First, understand the lifecycle of a Java program. You need to be able to explain clearly what happens when you compile and run a Java program. You should be able to explain in simple terms; What is bytecode, Java virtual machine, Java runtime environment, and why is Java portable?
Next, you need to understand object orientated programming concepts. This includes; classes, objects, abstraction, encapsulation, inheritance and polymorphism.
You should also understand collections in Java. For junior Java roles, it is important to show mastery of collections in Java such as, ArrayList, lists, maps, queue, and stack.
Data structures and collections are important in Java and have many use cases and every Java developer should be able to know what collection is appropriate for the right problem/situation.
Also learn garbage collection and memory management in Java. This includes a basic understanding of how memory is managed in Java. Stack and heap memory. And Garbage collection.
Finally, learn about testing. It is essential to understand the basics of testing in Java including unit testing. Testing is one of the most critical activities in the software development life-cycle and it is vital to understand testing in Java prior to an interview.
Thank you and best of luck!
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