Java Tutorial

Java is a high-level programming language originally developed by Sun Microsystems and released in 1995. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. This tutorial gives a complete understanding of Java.

This reference will take you through simple and practical approaches while learning Java Programming language.

What is java?

Java is a programming language that may be used to create software that is compatible with a wide range of operating systems. It is a two-stage programming language, which means that it has both an interpreted and a compiled version. It does not, however, compile straight to an executable file, which sets it apart from the majority of other compiled languages.

In Java, the code is first compiled and then converted into Java Byte Code, a binary format. The JBC is then translated into the native language required to operate in the target operating environment and compiled. Developers may create code once and run it elsewhere thanks to this divergent behaviour, which is a big advantage.

The “Write Once, Run Anywhere” (WORA) philosophy refers to this functionality, which quickly gained popularity and was much desired by developers. The WORA philosophy gained notoriety in 1995 when Sun Microsystems coined the phrase.

What Does It Mean?

Software written in Java, an object-oriented programming language, can run on various platforms. The compiled code, or “bytecode,” created when a Java application is written runs on the majority of operating systems (OS), including Windows, Linux, and Mac OS. Java’s syntax is heavily influenced by the C and C++ programming languages.

Why to learn java programming?

1. There are many job opportunities in Java

Java has one of the largest legacy code bases, or collections of source code, of any computer languages in use today. The development of Android applications heavily relies on Java. In addition, businesses from many industries, including significant tech companies like Facebook, Google, and Netflix, use Java.

2. Excellent Frameworks and Tool Support

software creation The performance of Java programmes is enhanced by Java tools. Despite the fact that Java is a for-profit technology owned by Oracle, there are a tonne of free tools available. Integrated development environments (IDEs), such as Eclipse and IntelliJIDEA, which are designed to document and debug your code, are a few of the most popular tools.

Java also offers a large number of frameworks, or ready-made pieces of code, that are frequently used as models for desktop and mobile apps. These frameworks are used by developers in place of writing original custom code.

3. It uses objects in its programming

An advanced object-oriented programming (OOP) language is Java. Programmers structure classes in object-oriented programming languages, which are then utilised to create objects (bits of data and code). This distinguishes it from functional programming languages like Python, which do not support object-based data storage.

With the help of the Java Virtual Machine (JVM), which can be found on various operating systems and contains a compiler that generates byte code, Java can also run on any device.

4. You Acquire Fundamental Knowledge

Many people believe that Python and other beginner-friendly languages are easier to learn than Java.

According to Dr. Clayton Miller, assistant professor for the School of Design and Environment’s Department of Building at the National University of Singapore, “There is no comparable in terms of online documentation, user community, ease-of-learning, and general capabilities of Python” (NUS).

However, mastering java code is a better option if you want to genuinely understand fundamental java concepts like algorithms and arrays or if you want to be able to move to other languages like C or C++.

5. Learning is Inexpensive

To understand Java syntax, you don’t need a bachelor’s degree in computer science. Only 9.1% of professional developers believe formal schooling is very crucial for becoming a developer, according to a StackOverflow study.

Applications of java programming

Java’s enormous popularity is a result of its platform freedom. Regardless of whether Java is installed in a desktop PC running Windows, Linux, or Unix, a Macintosh computer, a smartphone, or a mainframe computer, Java just needs a Java Runtime Environment (JRE) to be installed in order to function. Here are some locations where Java is often used.

Application Development for Mobile

Since the invention of smartphones, mobile application development has increased rapidly. The three most well-known smartphone app shops today host millions of mobile applications.

The Java language is a great option for creating complicated programmes with numerous interfaces because of its nature. Because it is so effective at establishing connections between various devices, it also functions well as a programming language for mobile applications.

Machine intelligence

Software with artificial intelligence can handle intricate automated calculations. Several businesses, including credit institutions, banking, Amazon’s Echo, and other smart gadgets, to mention a few, use AI software.

Big Data

The big data sector tracks and reports data for a variety of purposes. To keep track of users, contacts, products, sales, and more, many businesses employ data analytics. Java also makes it simple to develop visualisations that depict this data in a manner that is simple to comprehend and assimilate.

This benefit is a great fit for big data because of how effective it is in streamlining the process of working with a lot of data.

Application Development

Java is a fantastic choice for software development since it is adaptable enough to operate across a variety of various operating environments, in accordance with the WORA concept. Additionally, programmers can simultaneously construct software for multiple systems by writing the code just once and running it everywhere.

Any software created in Java can be immediately launched on any device that has a Java Virtual Machine installed due to the compile and interpret aspect of the language. The fact that Java is still widely used across a variety of sectors and is here to stay is largely due to this capability.

Mobile Blockchain Development

Over time, blockchain sciences have become more and more popular, partly due to the rise of cryptocurrencies. The earliest application of blockchain technology was to track timestamps on scientific articles, thus it is not just utilised for cryptocurrency.

This technique had the advantage of ensuring the accuracy of research paper timestamps and related data through cryptography. Since it has gained so much popularity, blockchain technology is now widely used, even in smartphones. This means that, similar to the creation of mobile applications, Java is a fantastic fit for mobile blockchain sciences.

Network of Things

The linking of physical items that need to interact and share data is referred to as the “internet of things,” a term that feels at the very least imprecise. Device communication has become more necessary and is now possible in a variety of ways. Airplanes and traffic controllers are one instance of this that highlights the requirement for device connection.

Fortunately, Java was designed as a programming language with the specific purpose of connecting devices in this manner, making it ideal for the task.

Internet Development

It is crucial to remember that Java has remained a mainstay in the web development industry throughout the years, despite the fact that a lot has changed. In the field of web development, it is still often utilised for database management and other purposes.

Java is still used by developers to build interactive web pages that greatly enhance user experience.

Types of java application

A secure, high level object-oriented programming language is Java. Sun Microsystems developed Java, which Oracle Corporation later took over. Java is widely utilised across computing systems, from business servers to mobile phones. Java is software that can run on all platforms and is platform neutral.

Java programmes must be categorised into

  • Standalone programmes
  • Web-based programmes
  • Enterprise software
  • Mobile programmes

Standalone Applications

A standalone application is one that runs independently of any other computer processes or external files. Additionally, operating system processes are not necessary. Swing and the AWT (Abstract Window Toolkit) are used to build standalone applications.

Web-based programmes

Web applications are client-server programmes that are executed by the client. Mail, online shopping, and Wikipedia content are all examples of web applications. The tools used to build web applications are servlet, jsp, and jsf.

Enterprise Application

Middleware apps are connected to enterprise applications. We use technology and services across the company to enable software applications and hardware devices. Therefore, we refer to it as an enterprise application. Enterprise apps are mostly made for business systems used by corporations, including banking institutions.

Java platforms

Java is a platform as well. Java generates a runtime environment where your Java programmes or applications execute as soon as you run one of its programmes or applications. Platforms are generally defined as operating systems like Microsoft Windows, Linux, Solaris, Mac OS, etc. Similar to how Java generates an environment at runtime where you can only run java programmes or applications, these platforms offer you an environment where you can run various types of software or apps. The hardware-based platforms are supported by the software-only Java platform (OS). A Java Virtual Machine (JVM) and an application programming interface are both included in Java platforms (API).

Java Platform Types

Java platforms are essentially Java softwares used in the creation and execution of Java applications or programmes. You can use and download these programmes. Java platforms come in four different flavours:

  • Standard Edition of the Java Platform (Java SE)
  • Java Enterprise Edition Platform (Java EE)
  • Java Micro Edition Platform (Java ME)
  • JavaFX

1. Java SE

This platform is the most fundamental or core. It explains the fundamentals of the Java programming language, including data types, syntaxes, classes, objects, and interfaces. High level classes used for security, networking, database access, etc. are also included. This platform is used to create all desktop and standalone applications. The Java SE Platform also includes the desktop application development frameworks AWT and Swing. The Java SE API can also be thought of as the Java programming language.

A Java virtual machine (JVM), development tools, and additional class libraries that are frequently used in Java applications are included in it in addition to the basic APIs.

2. Java EE

This system’s foundation is the Java SE platform. It also includes an API and runtime environment for creating and utilising multi-tiered, large-scale, dependable, scalable, and secure network applications. On this platform, all java web and corporate apps are created. This platform includes technologies like servlet, jsp, struts, JPA, and EJB, among others.

3. Java ME

For running Java programmes and apps on compact devices like smartphones, this platform also includes an API and a small virtual machine. This API, which is a subset of the Java SE API and includes certain additional class libraries, is beneficial for creating applications for mobile devices. On this platform, all java mobile apps and games are created.

4. JavaFX

In order to create rich client applications that function reliably across several platforms, JavaFX comes with a selection of graphics and media packages. Swing was intended to be replaced mostly due of its complexity. JavaFX gives the capability to construct user interfaces as well, making it much easier to create desktop and rich internet apps. JavaFX Scene Builder offers the ability to drag and drop UI components while creating apps.


  • You should be familiar with the fundamentals of software and computer usage.
  • You should have a solid foundation in software, programming, and computers.
  • You ought to be able to use the software rather well.
  • You can quickly learn Java programming language if you have some experience with C or C++ programming.
  • The majority of students studying computer engineering have prior experience with C and C++. So they can rapidly pick up Java.
  • You can start learning Java even if you have no prior expertise with C or C++, but you need also master the fundamentals of programming and how programmes operate. You could do so. How can I pursue a profession in software development? What is software programming? and programming for software.
  • You may jump right into learning Java if you have familiarity with any of the object-oriented programming languages.
  • Even programmers who use PHP, Python, JavaScript, and Node.js may learn Java.
  • Last but not least, you need to be very motivated to learn and master the Java programming language. It takes a lot of time and effort to learn Java. You must therefore put in a lot of effort and be committed to studying Java.


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