What Are The Key Skills That I Must Learn In Core Java In Order To Succeed As A Freelancer?

Java is a general-purpose computer programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible. It is intended to let application developers "write once, run anywhere" (WORA), meaning that compiled Java code can run on all platforms that support Java without the need for recompilation.


Core Java is just one aspect of Java. There are also advanced topics in Java-like JavaFX, Android, Spring, etc. You need to choose the direction/track you want to move ahead.


In Core Java, there are the following key areas where you can focus on


Multithreading and synchronisation- Synchronised method locks an object for any shared resource. When a thread invokes a synchronised method, it automatically acquires the lock for that object and releases it when the thread completes its task.


Generics in Java: Generics allow us to create generic classes, interfaces, methods that support different data types. This helps us write reusable code and provides type safety at compile time.


Serialisation in Java: Serialisation is converting an object into a sequence of bytes that can be persisted to a disk or database or sent through streams. The reverse process of creating an object from a sequence of bytes is called deserialization.


Exception handling in core java : Exceptions are events that occur during the execution of programs that disrupt the normal flow of instructions (eg, divide by zero, array index out of bounds, file not found). The exception handling in Java is one of the powerful mechanisms to handle the runtime errors so that the normal flow of the application can be maintained.


Collections Framework in core java: Java Collection framework provides many interfaces (Set, List, Queue, Deque) and classes (ArrayList, Vector, LinkedList, PriorityQueue, HashSet, LinkedHashSet, TreeSet). These are more useful for program designers regarding functionality and flexibility (in terms of running time).


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