The user side is doomed to failure in the absence of a strong and well-thought-out back-end application. Of course, Java is the best option for the back-end. What qualifications should a Java developer have?

You need to discover a Java developer who can act rapidly when employing them. An object-oriented language is Java. Thus, the developer should be well-versed on the fundamentals. Additionally, they must to be taught how to use them when programming.

Additionally, the candidates must to be knowledgeable about the entire Java environment. This comprises the Java Runtime Environment (JRE), Java Development Kit (JDK), and Java Virtual Machine (JVM).

They must to be knowledgeable about web services built on the Java platform.

1. How is great performance made possible by Java?

High performance is made possible via Just-in-Time compilation in Java. The JIT compiler speeds up compilation by compiling codes with similar functionality.

If your candidate can also describe Java bytecode and how JIT works to translate that into native machine code, that’s a good sign.

2. Describe the principles of OOPs.

Inheritance and polymorphism are examples of real-world concepts that object-oriented programming seeks to implement. Combining a piece of data with the function that depends on it is the primary goal of OOP. This prevents any other portion of the code from having access to this data.

Hire Java developers who are knowledgeable about the subject, not just those who can give the textbook response to this question. They ought to be aware that Java uses OOP as a foundation in order to make its code more readable and reuseable.

Further, you should expect a brief explanation of the 6 concepts which are:

• Object
• Class
• Abstraction
• Inheritance
• Polymorphism
• Encapsulation

3. What attributes of Java makeere (WORA) programme? it a Write Once Run Anywh

The best response would be:

Java is a WORA software because of JVM. Instead of being translated into hardware-friendly code in Java, the application is turned to bytecode. It is a WORA language since the bytecode may be executed on any machine that has a JVM.

The Java programmer will likely also address why WORA programmes written in C and C++ aren’t here.

4. What distinguishes an interface from an abstract class?

If you’re hiring senior Java developers, use this question.

Your Java programming candidate should begin by defining Interface and Abstract classes before going on to discuss the distinctions. It can be as short and straightforward as the following:

A class’s interface serves as a blueprint for implementation. Interface doesn’t have any explicit methods with codes.

You can design blueprints for concrete classes using abstract. At least one abstract method must be present in an abstract class. However, it might also include specific techniques.

The fact that interface classes are slow compared to abstract classes is one of their main contrasts. There are no fields that can be defined in the interface. However, in the abstract, you.

5. Can you describe Java’s concept of method overriding?

A feature called overriding enables a subclass to provide an implementation that is already offered by a superclass. They should be able to connect this response to Run Time Polymorphism when recruiting a committed Java programmer.

A command of the technical side of things alone, however, is insufficient. In reality, it’s important to check for problem-solving abilities while hiring Java programmers. You can query them on these 5 inquiring points.