Difference between Java and Javascript

September 30,2020 - 10 min read
Difference between Java and Javascript

Programmers and developers especially beginners often get confused between Java and Javascript. The reason for this confusion is primarily because of their similar names.

Both these languages are different and have their own functionalities but they have certain similarities also. Java and Javascript are usually used in different scenarios but sometimes there are an overlap of objectives of both these languages.

The presence of the word ‘Java’ gives us a good chance to understand both these languages in depth. If developers are equipped with a strong knowledge Java and Javascript then the difference between Java and Javascript would be clear.

We will begin our journey of understanding the difference between Java and Javascript by learning about Java. Let’s get started.

What is Java?

Java was released by Sun Microsystems in 1995. Java is a cross-platform, object-oriented programming language. We shall now comprehend each of these features of Java in detail.

Java is a cross platform language and by that we mean that the program’s source code is compiled into an intermediate “bytecode”. The bytecode is then executed by the JVM (Java Virtual Machine) which is the Java interpreter. This bytecode with the Java Virtual Machine would be executed in the same manner on all hardware platforms.

Another feature mentioned is that of object-oriented. Java is an object-oriented programming (also called OOP) language because it follows all the principle of an object-oriented language. Applications written in Java language are based on declaration of classes, creation of objects and the interaction between these objects. We would now understand each of the basic principles of Java or any other object-oriented programming language in brief. The basic principles of object oriented language are -


Inheritance is the name given to the concept when the child class derives properties and methods from the parent class. There are various types of inheritance in Java.


Next feature in line is encapsulation. This feature refers to the property of wrapping up of data together as a single unit. Encapsulation lets you hide the variables of one class from other classes. The variables of one class can be accessed from the method of that class only. Encapsulation is also called data hiding.


Abstraction is another feature of OOPs. Abstraction lets you hide certain details and show only the relevant and necessary information. Abstraction is an important factor for security of any application.


Polymorphism is the last feature we would discuss. The word polymorphism basically means many forms. In programming language, polymorphism is the ability of an object to take on many forms. In programming language, if a method acts differently based upon the object, it is called polymorphism. It is an important concept of object-oriented programming language.

Java is an open source language with a strong community support and over a million repositories on platforms like Github. It supports a number of frameworks like Spring, Struts and Hibernate. These frameworks and their regular updates make Java an interesting language to learn. It is mostly used to make server-side web applications.

Java remains so popular because it is cross platform, easy to learn and has a strong memory management system. Many developers start their journey by learning the basics of computing, data structures and algorithm in the Java language because it creates a strong foundation for your career as a developer.

Companies like HCL, Wipro, Capegemini, Tech Mahindra and a lot others use Java to build strong, robust applications with top notch security and high performance.

Now that we have understood the basic concept of Java, let’s jump straight to Javascript.

What is Javascript?

Javascript founded by Brendan Eich back in 1995 was initially used for browsers and creating interactive web pages. Javascript is an event-driven, functional and imperative language. It is popularly used to make dynamic effects on web pages like rollover, rollout and other interesting functionalities. It is also used to make both server side and client-side applications.

Basically, Javascript is a scripting language that adds complex features on the web. Whenever you see a scrolling video jukebox, animated graphics or simply an update, chances are that Javascript is at work. On a webpage, Javascript works in coordination with HTML and CSS.

Javascript was designed to run on browsers and hence every browser has a Javascript engine. Chrome’s v8 engine is an example of Javascript engine. In 2009, Ryan Dahl created Node, a C++ program that included Chrome’s v8 engine. Nodejs allows you to run javascript code outside of a browser.

With the advent of Nodejs and other advancements, Javascript has now diversified and has moved to other environments and can now develop a wide range of applications.

Let us have a look at what all can Javascript achieve in today’s time.

  • Firstly, it is now used at the server-side also. Nodejs is a framework which is used for server-side web development.
  • Javascript can also be used to make stand-alone desktop applications. Electron js is a cross platform framework used to build standalone software applications.
  • React is used with Javascript to create dynamic web and mobile applications. React native is used to create dedicated mobile applications only.
  • Angular is another framework, developed by Google, that can be used with Javascript in order to make dynamic web applications. It is a Model View Controller Framework.
  • React vr is another interesting thing that has emerged which is used to make virtual reality applications.
  • Tensor flow has become very popular lately. It is a javascript library that can be used to train machine learning models.

Now that we have seen the various uses of Javascript in different domains, you can easily understand the importance of Javascript in the world of technology.

It is used by giants like Netflix, Uber, Paypal to create dynamic webpages that are fast and secure. Javascript has become one of the most popular languages used in the world of technology

Now that we have understood the basic concepts of both the languages Java and Javascript, we shall now have a look at the basic difference between Java and Javascript.

Difference between Java and Javascript

As mentioned above, Java and Javascript are two different languages and the only striking similarity they have is the presence of the word ‘Java’. Here, we are going to enumerate the differences between Java and Javascript.


The first point of difference between Java and Javascript would be OOP’s. Java is an object-oriented language and we discussed this concept at length earlier in the same blog. However, Javascript is an object-oriented scripting language. Both the languages use objects to perform actions but Java is programming language whereas Javascript is a scripting language.


Java applications run on Java Virtual Machine (JVM), the Java Development Kit (JDK) and Java Runtime Environment (JRE) also need to be installed on the system to run Java programmes. However, Javascript code usually run on the browsers and doesn’t require any setup.


The syntax of Java is very similar to C and C++. Java uses class and objects to perform all functionalities. Javascript uses the naming convention that is similar to Java however the syntax of Java is similar to the C language only and not C++. It is important to remember that the syntax of Java and Javascript is not same but similar to some languages.


Java programmes are compiled and interpreted as a programming language. The code is first compiled and then it is interpreted. On the other hand, Javascript is only interpreted as it is not a programming language but a scripting language. The javascript code is treated as a plain text code.

Learning Curve

Both the languages are quite similar when it comes to the learning curve. In order to learn Java, you need to have a strong foundation of OOP’s concept and basic programming skills. There are various documentations, online tutorials and courses and community support to make you learn Java and build various applications on it.

On the other hand, a good knowledge of HTML, CSS and basics of web development will help you learn Javascript more efficiently. Javascript also has a well framed documentation and online resources to help you build web applications and websites. In a nutshell, Javascript is easier to learn compared to Java.


Here by scope we do not refer to the future of both these languages. We mean the scope of the variable in a program. Java uses block-based scoping, in this variable goes out of scope once the control comes out of the block. The variable would come out of the block if the control is taken away from it. Whereas Javascript uses function-based scoping. This means that the variable can only be accessed within the function.


Java is supported by almost all operating systems. Developers do not generally have any issues as it is supported by all leading operating systems like Microsoft, Linux and others. On the other hand, Javascript requires the support of browsers and fortunately it is supported by all browsers that comes with different operating system.


Java is often used as high-level programming language used to build various kinds of applications whereas Javascript is often used to adorn websites and web applications with interactive features and dynamic content.

With this, we come to an end of our discussion on difference between Java and Javascript. We hope that the confusion is clear that surrounds Java and Javascript is now clear. The only thing same is the presence of the word ‘Java’.

We have tried to cover every concept that is important to understand the difference between Java and Javascript. If you think we have missed upon something important or if you have any doubt, we would be more than happy to answer all your queries and help you become a good technocrat.

The blog was compiled to clear the confusion between Java and Javascript. It is very important to understand the difference between Java and Javascript in order to become a good developer. However, a lucrative career in technology demands proper professional guidance and not just theoretical knowledge.

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