Java vs. JavaScript: What’s the Difference? – IQCode

Java vs. JavaScript: Features and Differences

Java is a programming language used for creating applications for devices or browsers. It is known for its security, reliability, and portability. Java code is compiled into bytecode, which can run on any system with the Java Virtual Machine (JVM) installed. Java supports multithreading and object-oriented programming (OOP).

JavaScript, on the other hand, is a scripting language used for creating HTML documents and adding interactivity to web pages. It is lightweight and interpreted. JavaScript code runs directly in a web browser and does not require compilation. JavaScript supports functional programming and event-driven programming.

While Java and JavaScript share some similarities, they have distinct features and purposes. Java is better suited for creating backend and standalone applications, while JavaScript is mainly used for front-end development. Java requires a compiler to run, but JavaScript runs natively in a web browser.

Advantages of Java and JavaScript

Advantages of Java

  • Security: Java has a strong security model that protects against malicious attacks.
  • Portability: Java code can be run on any system with the JVM installed, making it highly portable.
  • Reliability: Java has a reputation for being one of the most reliable programming languages.
  • Scalability: Java can handle large-scale projects and is used in enterprise-level applications.
  • Community: Java has a vast and active community of developers, making it easy to find support and resources.

Advantages of JavaScript

  • Interactivity: JavaScript allows for dynamic and interactive web pages.
  • Easy to learn: JavaScript has a simple syntax and is easy to learn for beginners.
  • Client-side scripting: JavaScript can be used to create code that runs directly in a web browser, reducing server load.
  • Integration with HTML/CSS: JavaScript seamlessly integrates with HTML and CSS, allowing for easy manipulation of web page content.
  • Frameworks and libraries: JavaScript has a plethora of frameworks and libraries that make it easy to build complex applications.

Disadvantages of Java and JavaScript

Disadvantages of Java

  • Learning curve: Java has a steep learning curve and can be difficult to master for beginners.
  • Memory management: Java relies on a garbage collector to manage memory, which can cause performance issues.
  • Speed: Java is not the fastest programming language and can be slower than other languages.
  • Overhead: Java applications require a lot of resources to run, which can lead to high overhead costs.
  • Verbose code: Java code can be verbose and require a lot of boilerplate code.

Disadvantages of JavaScript

  • Browser compatibility: JavaScript code can behave differently across different web browsers.
  • Security vulnerabilities: JavaScript is vulnerable to cross-site scripting (XSS) attacks and other security vulnerabilities.
  • No compile-time checking: JavaScript does not require compilation, which can lead to runtime errors.
  • Scalability: JavaScript may not be the best choice for large-scale applications or projects.
  • Asynchronous programming: The event-driven programming paradigm used in JavaScript can be difficult to learn for beginners.

JavaScript vs. Java: Which One is Better?

There is no clear answer to which language is better – it all depends on the project requirements and goals. Java is excellent for backend development, while JavaScript is ideal for front-end development. Java is more reliable and secure, but JavaScript allows for interactivity and dynamic web pages. Both languages have unique advantages and disadvantages, and the choice between them depends on the specific use case.


Q.1: Is JavaScript easier than Java?

JavaScript is generally considered easier to learn than Java because of its simple syntax and immediate feedback in a web browser.

Q.2: Should I learn Java or JavaScript first?

It depends on your goals. If you want to focus on backend development, Java may be a better choice. If you want to create dynamic web pages and focus on front-end development, JavaScript should be your first priority.

Q.3: How is JavaScript different from Java?

JavaScript is a scripting language used for creating dynamic web pages, while Java is a robust programming language used for creating standalone or web applications.

Q.4: Can I learn JavaScript without knowing Java?

Yes, JavaScript does not require knowledge of Java, and the two languages have different syntax, purposes, and features.

Additional Resources

If you want to learn more about Java and JavaScript, here are some useful resources:

Java Programming Language

Java is a secure, reliable, and widely used programming language that allows developers to build complex applications, including mobile and web. It employs object-oriented design principles and features such as inheritance and encapsulation. A comprehensive computing platform that includes a compiler, execution engine, libraries, and more, facilitates Java program development and execution.

The Java Virtual Machine (JVM) is a crucial component of Java that allows byte code to be converted to machine code, which can then be executed by different machines, such as those running on Linux, macOS, Windows, and others. JVM enables Java to support Write Once Run Anywhere flexibility, ensuring adaptability across various platforms.

Different platforms suit various types of applications, including desktop and web ones, as well as API and Graphic User-Interface Development. The goal of Java applications is to enable programmers to develop and execute programs quickly, easily, and securely.

Features of Java

Java is a popular programming language that has several features, making it easy to use and understand. Some of the key features of Java are:

  • Simple and easy to understand language that comes with familiar code from C and C++.
  • Platform-independent, making it possible to run Java code on any platform, machine, or operating system. This is thanks to the Java Virtual Machine and Byte Code.
  • Object-oriented programming support, allowing for the use of popular OOP concepts like encapsulation, abstraction, and inheritance.
  • A combination of compilation and interpretation, giving the advantages of both methods for making the code executable on any machine or platform.
  • A secure and reliable language that includes tools and features for secure communication, authentication, cryptography and more.

JavaScript is a client-side scripting language that adds interactive functionality to web pages and applications. From interactive forms to animation graphics and slideshows, JavaScript helps create an immersive user experience. Together with HTML and CSS, it forms the core of front-end development. With the introduction of Node.js, JavaScript now can also do server-side development, making it one of the most versatile programming languages out there. JavaScript is used for adding interactive elements to web pages, developing web games, creating mobile applications, and back-end development.

JavaScript Features

//JavaScript is a frontend language that does not require server assistance.
//It is lightweight and prototype-based.
//Default parameters and user input validation are essential features.

//Default parameter function
function showMessage(message = 'No message provided.') {

//Prevents error caused by empty/incorrect user input
function validateForm() {
//Code to validate form inputs

JavaScript is a lightweight, prototype-based language that runs on the browser without needing a server. This results in quick performance and efficient use of resources. It comes with default params feature, which protects the code from simple mistakes and validates user input to prevent errors.


Java is an OOP programming language that requires compilation, while JavaScript is an OOP scripting language written in text and executed on web browsers. Below is a comparison between Java and JavaScript:

DEVELOPED BY Developed by James Gosling from Sun Microsystems Originally called LiveScript, developed by NetScape
WORKING Standalone programming language executed on JVM, needs compilation Scripting language needs to be placed inside HTML doc and run on web browsers
LANGUAGE TYPE Class-based object oriented programming language Prototype-based scripting language
OBJECT TYPE Class-based, creates objects based on defined class Prototype-based, creates objects based on a single prototype object
VARIABLE DECLARATION Supports static typing which requires variable and type declaration before compilation and execution Supports dynamic typing, type and variable can be defined anytime in the program
CONCURRENCY Supports concurrency using multi-threading Does not support concurrency or multiple events at the same time
COMPILATION AND INTERPRETATION Compiled into byte code and interpreted on JVM Interpreted only on web browser directly
SOURCE CODE VISIBILITY Source code is hidden as byte code that cannot be read by third party users Runs code on browser which is visible in plain text to everyone
REQUIREMENTS Requires entire JDK Only requires a text editor
SYNTAX Data types need to be explicitly declared Data types do not need to be explicitly declared
SECURITY Provides robust features for secure source code Programmers need to add functions for tight security
FILE EXTENSION Supports “.java” extension Supports “.js” extension
SUITABILITY Suitable for mobile, cloud-based, big data, web-based, and IoT applications Primarily used for front-side development, but can be used for web and server applications, game development, and web and mobile apps
KEY FEATURES Extensive libraries, simple and easy to learn, popular Lightweight, powerful frameworks, great for front-end development
COMPANIES USING Netflix, Google, Airbnb, etc. Paypal, Uber, Microsoft, etc.

Before deciding which language is better between Java and JavaScript, it’s important to consider the advantages and disadvantages of both and the specific requirements of your project.

Advantages of Java and JavaScript

Java language offers advantages such as platform independence, secure memory allocation, automatic garbage collection, and object-oriented programming concepts. It is widely used for developing web, desktop, and mobile applications.

JavaScript is a popular client-side scripting language used for web development. It offers benefits such as easy integration with HTML and CSS, support for functional programming, and a vast collection of libraries and frameworks.

Both Java and JavaScript are widely used in the tech industry and offer a range of advantages for developers and users alike.Advantages of Java


Java programming language has some distinct advantages that make it a popular choice for developers.


  • Write once, run anywhere (WORA): Java’s portability feature allows developers to write source code once and run it on different operating systems and machines.
  • Robust and secure: Its features safeguard against unauthorized access and cyberattacks, and it doesn’t support explicit pointers.
  • Automatic garbage collection: Unused objects are cleaned up automatically, preventing them from taking up unnecessary space.
  • Multi-threading: Java’s support for multi-threading enables multiple threads to run simultaneously, improving performance.

Advantages of JavaScript

// JavaScript is a powerful programming language with many advantages

// JavaScript frameworks provide collections of powerful features and functional elements for websites and applications
// This helps developers to easily create applications by using these frameworks

// JavaScript is mainly used for client-side development which gives more control to the browser
// It reduces the load on the server and increases the efficiency of code writing, validation and user input

// JavaScript executes directly on the browser which reduces the server support required for simple calculations
// This increases the speed of the development process and saves time

JavaScript is a powerful programming language with many advantages. Its frameworks provide collections of powerful features and functional elements for websites and applications. JavaScript is mainly used for client-side development which gives more control to the browser and reduces the load on the server, increasing the efficiency of code writing, validation and user input. JavaScript executes directly on the browser, reducing the server support required for simple calculations, increasing the speed of the development process and saving time.

Downsides of Java and JavaScript

Java and JavaScript, like any programming language, have their own set of disadvantages that developers should be aware of. Some of the downsides are:

- Java can be memory intensive and slow
- JavaScript can have cross-browser compatibility issues
- Both languages can be difficult to learn for beginners
- Java requires compilation before executing
- JavaScript code can be easy to manipulate and therefore less secure
Java’s Disadvantages: Performance, Memory Management, Backup, and Look & Feel


Java’s Disadvantages: Performance, Memory Management, Backup, and Look & Feel

When compared to C++ and C, Java’s performance is slower due to additional compilation and interpretation tasks, resulting in high memory consumption, which burdens the CPU and reduces efficiency.

Although Auto Garbage Collection of Java automatically collects unnecessary objects, it increases task completion time and puts a hold on all other threads’ workloads, calling it a benefit and drawback for Java.

Java provides robust features for storing and collecting data. However, it lacks the ability to back up data, which is a significant drawback.

Java offers several frameworks for developing the user interface for applications and web pages. But, they are not suitable for building high-scaled, complex user interfaces, thus lacking in Look & Feel, and functionality.

Issues with JavaScript

JavaScript has several drawbacks:

  1. Front-end security: Since JavaScript code runs on the browser, it can become visible and accessible to unauthorized users, reducing its integrity and security.
  2. Browser support: JavaScript can be run on any browser with its standardized version, but it can also result in inconsistencies in output and functionality.
  3. Time consumption: Converting complex functionalities into machine-understandable code can be time-consuming and can slow down website speed, leading to user frustration.

Javascript vs Java: Comparing the Two Programming Languages

After reading this article, it’s clear that neither programming language is superior to the other. However, Javascript is better suited for front-end scripting with its powerful frameworks for creating interactive GUIs. On the other hand, Java is faster, more secure, and reliable for server-side development. It has robust security features and rich libraries for developing mobile, desktop, gaming, and web-based applications. Ultimately, the choice between the two depends on the programmer’s project and its requirements.

Is JavaScript Easier than Java?

Yes, JavaScript is easier to learn than Java since it requires fewer tools and prior knowledge. To start writing code for web development, all you need is a text editor and programming knowledge.

//Example code using JavaScript

Which Should You Learn First: Java or JavaScript?

Learning Java is typically recommended before learning JavaScript, but JavaScript is easier to learn. Ultimately, the decision of which language to learn first is up to the individual.

Differences between JavaScript and Java

Although their names sound similar, JavaScript and Java are two different programming languages with distinct characteristics. The main difference lies in the fact that JavaScript is a client-side scripting language that adds functionality to web pages, whereas Java is a server-side programming language that must be compiled into bytecode using Java Virtual Machine (JVM) for running applications and programs.

Learning JavaScript without Prior Java Knowledge

Yes, you can learn JavaScript even if you don’t know Java. The two languages are not related to each other. JavaScript is mainly used for front-end development of web-based or GUI desktop applications. On the other hand, Java is used for backend development of mobile, desktop, web-based, and gaming applications.

Additional Resources

Find helpful resources related to Java and JavaScript below:

Top 10 Productivity Tools for Programmers

Differences Between SOAP and REST: A Comprehensive Guide – IQCode

10 Best SQL Integrated Development Environments to Know in 2023 – IQCode

The Ultimate Guide to Full Stack Engineer Salaries in 2023 – IQCode