A Java Developer is a Developer whose expertise lies in the design, testing, and execution of software in Java. Despite the similarity in name, Java must not be mistaken with JavaScript, a completely different computer language.
You should know the basic concepts of Object-Oriented Programming:
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Encapsulation is a state attained when an object’s state is private, encapsulated in its class (a blueprint with comparable features used by developers to generate objects), and public methods cannot access it.
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Abstraction happens when objects only reveal the essential details required to operate with it (making your program easier to develop).
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Inheritance happens when things are arranged into parent‐child constructs that share common logic but do not have to be identical.
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Polymorphism is a technique for using child classes in the same way as their base classes without changing the child class.
Aside from this, you should know:
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Logic and rigorous testing techniques are used to solve challenges.
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Java project planning
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Developing end-user documentation
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Writing and modifying programming code using computer systems.
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Fixing more complex bugs