Difference Between Java and JavaScript

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JavaScript Course With Certification: Unlocking the Power of JavaScript
JavaScript Course With Certification: Unlocking the Power of JavaScript
by Mrinal Bhattacharya
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JavaScript Course With Certification: Unlocking the Power of JavaScript
JavaScript Course With Certification: Unlocking the Power of JavaScript
by Mrinal Bhattacharya
Start Learning
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What is Java?

Java is a popular programming language known for its versatility and portability. It was developed by developers at Sun Microsystems (now owned by Oracle Corporation) and released in 1995. Java is known to be an object-oriented language that believes in the "write once, run anywhere" algorithm, meaning that Java programs can be executed on any machine or platform that has a Java Virtual Machine (JVM) installed.

Features of Java

Every language provides some features out of the box that makes it stand apart from other similar programming languages. The most common features of Java include:

  • It runs on a virtual machine called Java Virtual Machine, an environment used to provide some virtual configuration to a physical device.
  • It follows the object-oriented programming methodology.
  • It is platform-independent, meaning it can run on any platform like the web, android, etc.
  • It's strongly typed in nature, meaning that you need to define the type of a variable at the time of declaration.
  • It performs static type checking, implying that all your variable types are validated and evaluated at compile time.
  • It is multithreaded by default, or in other words, it can perform various tasks at the same time.

Here's a simple example of Java code:

In this example, we define a class called "HelloWorld" with a main method. This main method is entry point of a Java program. It prints the message "Hello, World!" to the console using the System.out.println statement. When this code is compiled and executed, it will display the message on the console.

What is JavaScript?

JavaScript is a high-level programming language commonly used for web development. It is primarily designed to add interactivity and dynamic elements to websites. One of the key features of JavaScript is its ability to manipulate and modify HTML and CSS, enabling developers to create responsive and interactive web pages.

Features of JavaScript

  • It is a scripting language that runs directly on a browser.
  • It supports both functional as well as object-oriented programming methodology*. This means that you can write your code using functions or classes and objects.
  • It is light-weight since it doesn't need a compiler.
  • It is weakly typed and performs dynamic type checking. So you can create variables without worrying about their types and also assign values about different types to these variables at runtime.
  • It supports both frontend and backend technologies on the client and server. This means that you can use it to create a user interface on the web or interact with a database.

Here's an example of JavaScript code:

In this example, the calculateArea function takes the width and height as parameters and returns their product. The function is then called with arguments 5 and 8, storing the result in the variable rectangleArea. Finally, the result is printed to the console using console.log.

Key Difference Between Java and Javascript

The main difference between Java and JavaScript emerges from their foundational design and deployment contexts. Java, a robust object-oriented language, was crafted for a broad spectrum of applications and operates on the Java Virtual Machine (JVM). In contrast, JavaScript began its journey tailored for web browsers, infusing interactivity into web content. However, with platforms like Node.js, its applications have extended to server-side operations. When comparing Java vs JavaScript, despite their analogous names, they diverge considerably in syntax, purpose, and philosophy. This divergence underscores the importance of recognizing them as separate entities, contrary to the occasional assumption of their interchangeability due to name similarity.

Difference Between Java and JavaScript

Developed ByJava is known to be an Object-Oriented language developed by James Gosling.Javascript (LiveScript), was developed by NetScape.
PurposeIt is a general-purpose programming or coding language, it can be utilized for wide range of uses, including web development, mobile app development, enterprise software, and more.It is primarily used for client-side web development, enabling interactivity and dynamic content on websites.
Object TypeJava supports the static typing which requires variable and type declaration before the starting of compilation and execution.Javascript(JS) supports the dynamic typing, where type and the variable can be defined anytime in the code. For example, you do not have to define the variable ‘c’ type (integer, float, etc) during the compile type. You could do that even during the run-time as well.
Compilation and InterpretationIn Java, the source code is by default hidden, in the form of byte codes that cannot be read by unauthorized person or third party users.Javascript is a scripting language and runs code on a browser which is visible in plain text to everyone.
ConcurrencyJava uses multi-threading to carry out many tasks simultaneously.JavaScript uses an event-driven, non-blocking I/O model and is single-threaded, relying on mechanisms like callbacks and promises to handle asynchronous operations.
Standard LibrariesJava boasts a rich set of standard libraries, covering everything from data structures to network operations.JavaScript’s standard libraries primarily support web functionalities, though the ecosystem (like Node.js modules) has expanded these capabilities.
PlatformDesigned for desktop, backend, and Android apps.Runs primarily in web browsers.
AttributesAttributes are typically private fields in a class. To access or modify these fields, one generally uses public methods known as getters and setters.Properties are openly accessible and modifiable on objects. ES6 introduced “get” and “set” keywords for property access and modification, allowing for a more controlled approach similar to Java’s getters and setters.

When to Choose Java over JavaScript?

Understanding the Advantages over the other language makes it easy to choose:

Advantages of Java over JavaScript:

  • Performance: Java is typically faster and more efficient than JavaScript, as it is a compiled language. Strong Typing: Java’s statically typed nature ensures type safety, catching potential type-related errors at compile-time.
  • Multi-threading: Java has built-in support for multi-threading, making it suitable for performance-intensive applications.
  • Robust Standard Library: Java offers a comprehensive standard library, particularly for backend and system-related operations. Platform Independence: Java’s “write once, run anywhere” philosophy means it can run on any device with a JVM.
  • Scalability: Java is the go-to for large-scale enterprise applications due to its robustness and scalability features.

Disadvantages of JavaScript over Java:

  • Limitations on Backend: Originally designed for the web, JavaScript is not as versatile for backend development as Java.
  • Concurrency: JavaScript operates on a single-threaded event loop, which can cause limitations for CPU-bound tasks.
  • Lack of Standard Libraries: While growing, JavaScript’s standard libraries are not as extensive or standardized as Java’s.
  • Type Safety: Being dynamically typed, JavaScript can introduce type-related runtime errors.

When to Choose JavaScript over Java?

Understanding the Advantages over the other language makes it easy to choose:

Advantages of JavaScript over Java:

  • Web Integration: JavaScript is native to web browsers, making it the primary choice for front-end web development.
  • Event-Driven & Asynchronous: Designed for non-blocking operations, making it suitable for tasks like web animations and single-page applications.
  • Rapid Development: With frameworks like Node.js, JS can power both frontend and backend, streamlining the development process.
  • Dynamic Typing: Offers flexibility in data handling without strict type definitions.
  • Rich Ecosystem: Abundance of libraries, frameworks, and community support tailored to web solutions.

Disadvantages of Java over JavaScript:

  • Verbosity: Java tends to be more verbose, which can slow down development for some tasks. Compilation Step: Java requires a compilation step, potentially lengthening the development and debugging cycle.
  • Not Native to Browsers: For web-based applications, Java requires additional plugins (like Java Applets, which are now deprecated) or solutions.
  • Performance Overhead: While Java is powerful, the JVM (Java Virtual Machine) introduces an overhead, which isn’t ideal for lightweight applications or web pages.
  • Steep Learning Curve: For new developers, especially those focused on web development, Java can be more challenging to learn initially than JavaScript.


  • Java is a powerful, statically typed language primarily used for robust, large-scale applications, with the promise of “write once, run anywhere” due to its platform independence.
  • JavaScript, on the other hand, is a dynamic, interpreted language primarily known for enhancing web interactivity and responsiveness.
  • When it comes to web-based applications, Java requires additional support, while JavaScript is native to browsers.
  • The choice between Java and JavaScript largely depends on the project’s requirements, with Java being more suitable for backend, enterprise-level applications, and JavaScript excelling in web development and frontend tasks.


Q. Which is better Java and JavaScript?

A. Neither Java nor JavaScript is inherently better than the other. The choice depends on the specific use case. Java is well-suited for enterprise applications and performance, while JavaScript excels in web development and interactivity.

Q. What is common between Java and JavaScript?

A. Both Java and JavaScript are programming languages used in software development. However, their similarities largely end at the name. Java and JavaScript have different syntax, purposes, and use cases.

Q. Which is more difficult Java or JavaScript?

A. Neither Java nor JavaScript is inherently more difficult than the other, it largely depends on what you're trying to achieve, your previous coding experience, and your understanding of programming concepts. Both have their own set of complexities and subtleties which can be challenging for beginners.

Q. Do I need to learn Java before JavaScript?

A. No, learning Java is not a prerequisite for learning JavaScript. Java and JavaScript are distinct programming languages with different use cases. While some concepts may overlap, it is possible to learn JavaScript without prior knowledge of Java.