Java is a technology that includes a programming language as well as platform software. Java bytecode runs without change on every JVM-enabled platform, allowing you to run your Java code anywhere. The JAVA software platform is made up of JAVA, the API, and a fully established environment.

Here’s a list of top skills that a Java Programmer must posses:-

1.Frameworks for the web (e.g., Struts and Spring)

A web framework (WF) or web application framework (WAF) is a software framework that helps developers create web applications such as web services, web resources, and web APIs. Online frameworks are a set of guidelines for creating and deploying web applications on the Internet.

2.Servlets and JavaServer Pages (JSP)

It’s a programming language that’s used to make online apps. It is employed in the creation of dynamic online content. JSP tags are used to insert JAVA code into HTML pages in this example. It’s a web-based technology that allows us to build dynamic, platform-independent web pages.

3.Web technologies like HTML, CSS, JavaScript, and JQuery

The use of markup languages and multimedia packages to communicate between computers is referred to as web technology. It allows us to engage with information that is hosted on the internet, such as webpages. Hypertext markup language (HTML) and cascading style sheets are used in web technologies (CSS).

4.Web services (SOAP/REST) and service-oriented architecture

REST is an architectural pattern, whereas SOAP is a protocol. REST employs Uniform Service locators to access the components on the physical device, whereas SOAP uses service interfaces to offer its capabilities to client applications. SOAP requires extra bandwidth for its operation, but REST does not.

5.Concepts and techniques of object-oriented programming (OOP).

Object-oriented programming (OOP) is a programming paradigm based on the concept of “objects,” which can hold data and code in the form of fields (also known as attributes or properties) and procedures (often known as methods).

6.Markup languages like XML and JSON

A markup language is a set of instructions for annotating text so that a computer can manipulate it. Because the annotations are written in a way that distinguishes them from the text, most markup languages are human-readable.

7.Serialization and file IO

Serialization is the process of storing an object’s states in a permanent format (such as a file stream or database) and retrieving them later (de-serialization). If a class implements the java. io. serialise interface, an object of that class is serializable in Java. Interface that can be serialised.

8.Interfaces and abstract classes

In computer languages, an abstract type is a type in a nominative type system that cannot be directly instantiated; a concrete type, on the other hand, can be instantiated.

9.Constructors:-
Constructors are used to initialize values to class variables in a program.They are of the same name as that of the class.They can be both parameterized and non-parameterized.In simple terms,they are functions that are used to initialize values to variables,the only difference being,the name of the function is same as that of the Class.

10.Lists, maps, and sets are examples of collections.

The collection of the items refers to any group of individual objects that are represented as a single unit.

In Java, a collection is a framework that provides an architecture for storing and manipulating a collection of objects.