What is the Difference between Java and JavaScript?

What is the Difference between Java and JavaScript?

Difference between Java and JavaScript have long been misunderstood by new programmers and non-tech individuals alike, but their only similarity is the term “Java.” Each is a useful programming language in its own right, with advantages over the other. Programmers use both Java and JavaScript for a number of tasks, but one isn’t inherently better than the other.

The success of the Java programming language at its height at that time is the key reason for introducing the scripting language as JavaScript. It was introduced as JavaScript in order to take advantage of the success of the word ‘java’ in the Java programming language.


Java, published by Sun Microsystems in 1995, is a programming language and computing platform.

For several platforms, it is a programming language that constructs applications. The compiled code (known as bytecode) runs on most operating systems (OS), including Windows, Linux, and Mac OS, when a programmer writes a Java application.

From the programming languages C and C++, Java gets much of its syntax.

Java can be run on a single device to build full applications, or it can be spread through a network of servers and clients. It can also be used to make a small software module or applet that can be inserted into a webpage.

For application creation, Java is used. Let’s take a look at several other applications for Java:

  • App for the desktop 
  • Applications on the Internet 
  • API for Android 
  • Computing with the Big Data Cloud 
  • Enterprise Robotics app 
  • Intelligent cards 
  • Embedded Scientific Applications Device 
  • Games on computers


JavaScript is a text-based programming language that assists you to provide web pages interactive, using both the client-side and the server-side. Where HTML and CSS provide structure and design to web pages, JavaScript adds interactive elements that keep users engaged. The search box on Amazon, a news recap video embedded on The New York Times, and refreshing your Twitter feed are all examples of JavaScript that you may experience on a daily basis.

By transforming a static web page into an interactive one, adding JavaScript enhances the user experience. JavaScript, to recap, adds actions to web pages.

For web-based applications and web browsers, JavaScript is primarily used. But in apps, servers, and rooted hardware controls, JavaScript is however used outside of the Network. JavaScript is used in these ways:

  •  Including interactive features of web pages
  • Creating smartphone and web applications
  • Creating a game
  • Developing server software and creating web servers

There is a big difference between Java and JavaScript. Both have their own advantages and disadvantages too:

Advantages of Java:

Here, the advantages/ pros of using Java are

  1. There is comprehensive documentation available.
  2. There is a wide pool of professional developers available.
  3. A large number of third-party libraries are open.
  4. It enables standard programs and reusable code to be created.
  5. It is a multi-threaded environment that enables you to perform many tasks in a program at the same time.
  6. Outstanding results.
  7. Libraries that are easy to navigate.

Disadvantages of Java:

Here are the disadvantages of using the Java language.

  1. The JIT compiler makes the software reasonably slow.
  2. Java has high specifications for memory and processing. Hardware costs are also rising.
  3. It does not have support such as pointers for low-level programming constructs.
  4. You have no power over garbage collection because Java lacks functions like delete() and free() ().

Advantages of JavaScript:

  1. It is an open-source project funded by Microsoft.
  2. Specially crafted tiny script tool.
  3. Groups, interfaces, & modules are supported.
  4. In any window, the compiled JavaScript runs.
  5. Cross-compilation enables.
  6. You can use JavaScript to write massive apps by extending it.
  7. You can use JavaScript to store and retrieve user device information
  8. Immediate feedback to attendees
  9. It enables you to create user interfaces that respond when the mouse has hovered over.

Disadvantages of JavaScript:

  1. Side-of-client JavaScript does not allow files to be read or written. For security purposes, it has been held.
  2. For networking applications, JavaScript can’t be used because not much support is available.
  3. JavaScript does not have any features for multithreading or multiprocessors.

Some major difference between Java and JavaScript:

Description for Variable:


Java is a language that is strongly typed, so the variable should be declared first before it is included in the program.


Since JavaScript is a weakly typed language, variables can be declared anywhere they’re needed.

Language Type:


It is an object-oriented language for programming.


It is a scripting language based on objects.


The Object Form: 


Java objects are class-based, so without creating a class, you can’t build any program in Java.


Objects are based on prototypes.


The extension: 


It has a ‘.Java’ file extension.


It has the extension file ‘.js’


The phase of Compilation: 


It is both interpreted and followed. Java is a programming language that transforms source code into bytecodes. It is performed by JVM (Java Virtual Machine).


Both browsers provide a JavaScript interpreter that allows JavaScript code to be executed.




Until execution on the client, compiled on the server.


The client interprets (rather than compiles) the data.


Code Type:


Object-oriented architecture. Applets consist of inherited classes of objects.


It’s object-oriented. Code uses built-in objects that are extensible but does not use any classes or inheritance.




There must be declared data types.


Undeclared data types.


Language type:






Key Tools: 


  • Amazing repositories
  • Frequently used
  • Excellent instrumentation


  • Usable on the frontend/backend
  • It is there, everywhere.
  • There are numerous excellent frameworks available.

Famous Companies Using This Technology:


Instagram, Airbnb, Uber Technologies, Netflix.



Coursera, Reddit, and eBay are only a few examples.



class A {

public static void main(String args[]){

System.out.println(“Hello World”);






<title>My First JavaScript code!!!</title>


alert(“Hello World!”);









In the United States, the average income for a Java developer is $103,464 per year.



For a JavaScript developer, the average salary in the US is $113,615 per year.

Final Thoughts:

In this article, we have described some of the difference between Java and JavaScript. I hope this will help you choose between these two.

Leave a Reply