CodeGym /Java Blog /Random /Revel about Java And JavaScript
Manikandan Murugesan
Level 3

Revel about Java And JavaScript

Published in the Random group


Java is a general-purpose programming language designed with one mantra in mind—”write once, run anywhere.” Java applications are compiled into bytecode that can run on implementations of the Java Virtual Machine (JVM). JVM helps bridge the gap between source code and the 1s and 0s that the computer understands. Any machine that has the JVM installed can run Java. In web development, Java features most prominently as a server-side language and the programming language of choice for mobile apps on the Android platform. It also still has a decent presence on the front-end as a Java applet, although this is falling out of favor due to security concerns.


Alongside HTML and CSS, JavaScript (standardized as ECMAScript) is considered one of the big three core components of the web. Employed by a majority of websites, JavaScript is a scripting language that typically runs in the browser and makes web pages dynamic and interactive. Today JavaScript is also quickly growing as a server-side technology since the release of Node.js in 2009.


As different as they are, there are some top-level similarities worth considering, especially if you are looking at web development when comparing Java to JavaScript. Object-Oriented Programming (OOP). Both languages require the developer to code in terms of objects and their relationships to one another. By extension, this gives both languages access to techniques like inheritance, encapsulation, and polymorphism. Front-End Development. Both languages can be used in aspects of front-end development. JavaScript can be embedded directly into HTML, implemented as a framework or library; Java can be used as a Java applet. Back-End Development. Both languages can be used on the server-side. Java has long been used to power back-end technologies like Apache, JBoss, and WebSphere. Node.js has become a launch pad for JavaScript-powered servers


It’s important to remember that Java and JavaScript were developed to serve entirely different purposes. Java was designed as a general purpose programming language for building standalone applications, whereas JavaScript is a scripting language built specifically to interface with web technologies, namely HTML. When Java was released by Sun in 1991, it was initially being used to program consumer electronics like VCRs. JavaScript was introduced to be used with Java as a client-side scripting language that could run in the browser without having to be compiled. Let’s take a closer look at some of the major differences between these two languages. Compiled vs. Interpreted. Java is considered a compiled programming language. JavaScript is considered an interpreted scripting language. The difference is in the implementation: Java is compiled into bytecode and run on a virtual machine, whereas JavaScript can be interpreted directly by a browser in the syntax it is written (although it is usually minified in practice). Static vs Dynamic Type Checking. Java uses static type checking, where the type of a variable is checked at compile-time. The programmer must specify the type (integer, double, string, etc.) of any variable they create. JavaScript, like most scripting languages, uses dynamic typing, where type safety is verified at runtime. It is not required for a programmer to specify the type of any variable they create. There are many pros and cons for these two paradigms, but the primary advantage of static type checking is that type errors are caught early in development, and because the compiler knows exactly what data types are being used, code typically executes faster or uses less memory. The primary advantage of dynamic type checking is programmer productivity—you are free to assign types at your leisure. Concurrency. The ability to handle the execution of several instruction sequences at the same time is handled very differently between Java and JavaScript. Java makes use of multiple threads to perform tasks in parallel. JavaScript, particularly as it exists as Node.js in server-side applications, handles concurrency on one main thread of execution via a queue system called the event loop, and a forking system called Node Clustering. For most use-cases, both methods work just fine, but Java is generally faster because thread to threadless-Basedaring much faster than interprocess communication (IPC). Class Based vs Prototype Based. Java follows class based inheritance—a top down, hierarchical, class-based relationship whereby properties are defined in a class and inherited by an instance of that class (one of its members). In JavaScript, inheritance is prototypal—all objects can inherit directly from other objects. Hierarchy is accomplished in JavaScript by assigning an object as a prototype with a constructor function.


As with all languages, the choice really boils down to what you’re trying to build and what resources you have at your disposal. JavaScript is still very much a web technology, whereas Java is a general purpose language that can build anything. You should consider Java if your project involves…
  • Android Apps
  • Enterprise Software
  • Scientific Computing
  • Big Data Analytics
  • General Purpose Programming of Hardware
  • Server-Side Technologies like Apache, JBoss, Geronimo, GlassFish, etc.
You should consider JavaScript if your project involves…
  • Dynamic single page applications (SPAs)
  • Front-End technologies like jQuery, AngularJS, Backbone.js, Ember.js, ReactJS etc.
  • Server-Side technologies like Node.js, MongoDB, Express.js, etc.
  • Mobile App Development through PhoneGap, React Native, etc.
  • Keep in mind that neither list is extensive, these are only meant as a starting point to help you get a feel for what you can expect and what keywords you can use to assess the best language for your needs
Comments (12)
Akshat Raaj Level 2, Patna, India
20 January 2022
Joe M Level 47, Owings Mills, United States
6 September 2021
good, useful article! Level 3, मुंगेली, भारत
7 January 2021
java and javascript nice.
MANIKANDAN N Level 1, Delhi, India
25 September 2019
Understandable article
Jarib Wetshi Level 2, Nairobi, Kenya
27 January 2019
Wow, this was really helpful. Thank you.
antilik Level 2, Kiev, Ukraine
21 October 2018
It's very interesting topic. Thanx.
kapil Level 12, delhi, India
18 October 2018
please tell me what all languages or technologies i need to develop a website like facebook/ amazon/ flipkart......start from beginning till end......means everything by name and with short description of each..... thanks
Augustine Yanthan Level 2, Kohima, India
7 October 2018
SHOULD I USE JAVASCRIPT OR JAVA FOR MY NEXT PROJECT? It really clarifies my doubts after reading it. Thx for posting.
Muhammad Yasir Level 5, Islamabad, Pakistan
11 September 2018
It is a very useful and informative article with information presented in a concise way!
Manish Mathe Level 4, Indore, India
15 August 2018