20+ Differences Between Java and Java Script

They may share half a name, but Java and JavaScript are very different programming languages. If you compare Java’s syntax to JavaScript’s, you’ll notice that they look very different at first glance and that these differences go far beyond appearance.

In 2022, JavaScript will have been ranked as the most popular programming language by SlashData’s annual survey for the tenth time in a row. Java is now the fifth most common language used in the IT industry.

Comparison Between Java And JavaScript

DefinitionYou need to declare a variable in Java before using it because it’s a strongly typed language. When writing your code, you must define the variable and ensure it’s the right type.JavaScript is a computer language that uses dynamic typing and has a less rigorous syntax than other languages and fewer limitations.
TypingIn a programming language that employs strong typing, the data type of the variable’s data must be defined before the variable may be declared or used. This is a prerequisite for both actions. The accuracy of the typing guarantees that the data are formatted correctly.If the programming language has limited data typing, users don’t have to worry about the data type until it’s correctly specified. So, unless the data type is mentioned, users don’t need to be concerned about it.
ApplicationApplications created in Java can run on any Java Virtual Machine and work on any web browser (JVM).With Node.js, you can run JavaScript code on the server, not just in the browser like before. It used to be a browser-only feature, but now you can do it outside the browser too.
Based onYou can’t design a program without a class in Java because classes are necessary to create objects. Classes are like building blocks for objects in Java. If you want to create an object in Java, it must be assigned to a class.In the process of producing JavaScript objects, prototypes are used as crucial building pieces that are part of the process. These prototypes will be available for access and use during the building phase.
ExtensionThe JVM (Java Virtual Machine) is responsible for executing Java programs. When you write a program in Java, the source code is converted into bytecodes that the JVM can run.Every browser has a built-in JavaScript interpreter that can run JavaScript code. JS files can be placed in any directory and are identified by the .js extension, indicating that they are read and interpreted rather than compiled.
ApplicationJava is a versatile programming language that can create many programs, such as desktop software, mobile apps, games, website backends, and servers. Many large digital companies, including Netflix, Google, and Twitter, use Java to power their platforms.As of November 2022, 98.2% of all websites utilize JavaScript, according to statistics compiled by W3Techs. Based on data compiled by First Site Guide, approximately 1.98 billion websites are online. Really, that’s a lot of JavaScript. It can transform a brochure-like website into an interactive program in your web browser.

What Is The Difference Between Java And Java Script?

What exactly is Java☕️?

Java claimed that programs written in it could be executed on any platform when it was first introduced. Its initial success as a tool for developing client- and server-side applications led to its rapid adoption.

Its syntax is quite close to that of C and C++. Because the compiler and JVM take care of low-level functions automatically, it is simpler to comprehend and has fewer features.

Key Difference: Java

  • Back in 1991, Java development was started by James Gosling. Its original purpose was interactive television, but its technological sophistication was ahead of its time for cable. 
  • Oak came first, then Green, and eventually the coffee-inspired Java as its official name. When the Green Team first appeared, they began Java’s history. 
  • While Java initially intended to power interactive television, the technology was ahead of its time and never caught on with digital cable providers. 
  • Members of the Java team, popularly known as the Green Team, conceptualized this project to create a language for home media devices. 
  • Still, it functioned best as code for the World Wide Web. Netscape eventually added support for Java-based applications. 
  • James Gosling, often called “the father of Java,” created the language in 1995. In the early 1990s, James Gosling and his colleagues began working on this. 
  • Java was first conceived as a language development effort in June 1991 by James Gosling, Mike Sheridan, and Patrick Naughton. Green Team, the solar engineering group. 
  • “Java was one of the top candidates along with Silk,” as stated by James Gosling. Many team members favored the name Java since it stood out.

What exactly is JavaScript🌐?

In many contexts, JavaScript seems to act as a disruptive natural force. While JavaScript was first developed to meet the demands of browser-based client-side applications, it has now made its way to the server and desktop through the NodeJS framework, and it is here to stay.

The best user interface frameworks, like AngularJS, are compatible with any back-end solution. Multiple hybrid mobile app frameworks have recently emerged. They are cross-platform and may be used on various mobile devices without recompilation.

Key Difference: JavaScript

  • Netscape developer Brendan Eich developed JavaScript in about ten days. It was in 1995 when Brendan Eich of Netscape Communications developed JavaScript. 
  • The language was included in the first version of the Netscape Navigator web browser, which came out in beta form in September 1995. 
  • Originally known as Mocha, the moniker was modified to LiveScript before finally settling on JavaScript following the introduction of Navigator three months later. 
  • The JavaScript programming language was developed by Netscape and Eich specifically for use with the company’s main web browser, Netscape Navigator. 
  • Originally called LiveScript, Netscape renamed it JavaScript to promote it alongside Sun Microsystems’ Java programming language. 
  • More and more browsers have added JavaScript support since it was first released. They needed JavaScript if they wanted to execute code in the browser. 
  • The fact remains, nevertheless, that JavaScript was not taken seriously as a programming language for a considerable portion of its existence. 
  • When Google released Chrome V8, an open-source version of their high-performance JavaScript engine, in 2008, it marked a turning point for the language. 

Contrast Between Java and JavaScript


  • Java – Java is a programming language developed by Sun Microsystems and made accessible to the general public for the first time in 1995. Java is a cross-platform, object-oriented, and network-centric language.

    Oracle Corporation ended up buying this company in the end. The Java programming language is compatible with virtual machines. This is the point where the Java code has to be compiled.
  • JavaScript – Despite its name, JavaScript is not a component of the Java platform but an object-oriented programming language that may be used to create dynamic web pages.

    This programming language rigorously complies with the rules for client-side programming, enabling it to execute solely inside the client’s web browser without requiring any assistance from the server. Netscape, Inc. was the company that first developed JavaScript, and its code consists only of text.

How it is typed:

  • Java – Before a variable may be created in Java or used in any manner, the developer must establish the associated data type. This step must be completed before the variable may be utilized in any capacity.

    For instance, if a variable is declared “int a,” it can only store values compatible with the integer data type. This restricts the variable’s potential contents.
  • JavaScript – Because JavaScript is a dynamic programming language, the data type of a variable is irrelevant regardless of whether the variable is declared before or after it.

    This is correct both before and during the declaration of the variable when you type “var a,” the value of the “a” variable is determined by the information you provide.


  • Java – Compiling Java programs is a necessary step that must always come before any effort to run the program in the Java environment. It is not a simple task to acquire fluency in this language.

    Java applications may be executed even if a browser is not present, called “standalone mode.” With the help of multi-threading, users of Java have the capability of doing astounding things. It exerts a considerable burden on one’s ability to remember things.
  • JavaScript – It is necessary to include JavaScript in the HTML code so that it may be executed. It is a language that is considered to be one of the easiest to learn.

    A web browser is necessary for JavaScript scripts to perform their intended functions. JavaScript does not support any user-defined functions at this time. This quantity of random access memory (RAM) is not required.


  • Java – When a language is compiled, such as Java, it undergoes tests and optimizations before generating the byte code that the Java Virtual Machine (JVM) can understand.

    It flags many syntactical mistakes at build time and informs programmers to fix them. After that, the programmer works with a Java Archive (JAR) or Web Archive (WAR) file, a compressed bundle of byte codes used for web applications.
  • JavaScript – Languages like JavaScript that are read and interpreted at runtime are called “interpreted.” In today’s world, the performance impact from the activity of interpretation is scarcely visible because of how quick and strong interpreters have gotten.

    In one sense, it enables various “creative” solutions and dynamic alterations to the preexisting code. Conversely, it encourages a mindset that values quick fixes, duct tape, smart coding, and unorthodox approaches.


  • Java – Due to Java’s long history, a sizable community has sprung up around it, providing a wealth of resources and tutorials for learning the language.

    It’s a good choice for dependable native applications due to its speed, which is comparable to or better than most other modern compiled languages and much faster than interpreted languages.

    Java can perform multiple tasks simultaneously, unlike JavaScript, which must wait for each task to finish before beginning the next.
Features Of Java
  • JavaScript – JavaScript’s essential features are largely responsible for its success. Thanks to just-in-time compilation, it can be run instantly in the browser without needing a pre-compile. Every major web browser supports it.

    It’s the brains behind many cool things you see on the web, from auto-updating data to fancy animations, error-checking forms, chatting and commenting, and more.
Features Of Javascript

Advantages And Disadvantages Of Java And Javascript

✔️ Advantages Of Java

  • Any platform that has a JVM can run code thanks to platform independence.
  • Robustness and security with effective memory administration and built-in security mechanisms.
  • Modular and reusable code is encouraged by object-oriented programming.
  • The large array of frameworks and a rich standard library.
  • Scalability for developing business-level apps.
  • Resources and a large community for cooperation and support.

Disadvantages Of Java

  • Code that is too verbose may have more lines and be more complex.
  • The steeper learning curve, particularly for those new to OOP or beginners.
  • System performance can be impacted by memory usage.
  • Slower starting time as a result of bytecode interpretation and JVM initialization.

✔️ Advantages Of Javascript

  • Client-side interactivity improves website user experience.
  • Simple alteration and customization of web pages using HTML and CSS.
  • Flexibility for developing on both the client and the server sides.
  • A vast ecosystem of libraries and frameworks for quick development.
  • Asynchronous programming for effective task management.

Disadvantages Of Javascript

  • Browser incompatibilities between several browsers.
  • Execution on the client side poses security issues.
  • Compared to compiled languages, poor performance.
  • The absence of static typing could result in errors.
Comparison Between Java And Javascript

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Frequently Asked Questions (FAQs)

Q1. What exactly is the function of Java?

Java is the language that must be used for developing Android mobile applications. In point of fact, Java is the language in which the Android operating system is developed.

Kotlin is still dependent on the Java Virtual Machine and can communicate with Java programs even though it has recently emerged as a viable alternative to Java when developing for Android.

Q2. What was the impetus behind the development of Java?

Initially developed as part of a research effort, Java’s programming language was meant to create increasingly complex software for a broad range of network connections and embedded systems.

Sun Microsystems served as the project’s lead and received funding from the National Science Foundation.

The goal was to develop a real-time operating platform that was small, reliable, portable, and distributed over several nodes.

Q3. Why is Java classified as an object-oriented programming language?

OOP provides programs with a clear structure to follow throughout their execution. OOP makes it easier to edit, maintain, and debug Java code by guaranteeing that it does not repeat itself and preserving the programming’s DRY (Don’t Repeat Yourself) principle.

OOP makes it possible to develop completely functioning programs that can be reused in a substantially shorter time and with significantly less code.

Q4. Is there a risk involved while utilizing JavaScript?

To get access to protected data, steal it, or taint it, it is simple for cybercriminals and other threat actors to exploit JavaScript by inserting query strings into forms.

This makes it possible for them to do any of these things. Processing personally identifiable information in client-side websites and apps often uses JavaScript, the industry standard and widely used programming language.

Q5. What are the five distinct kinds of data that JavaScript can support?

Five data types are considered basic or elementary that may be utilized with JavaScript. The five most basic data types are null values, integers, boolean values, and strings.

Integers are the sixth most fundamental kind of data. Our team refers to them as “basic data types” when discussing them. When one variable is used to store information, it can hold just a single kind of data at a time.

Differences Between Java And Java Script

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