What is the difference between Java and JavaScript?

Java and JavaScript, the two may sound similar to most people, because there are similarities in the word “Java” in both, but they are not the same. Although Java and Javascript are used to develop web and mobile applications, there is a very important difference between Java and JavaScript. In this article, we’ll look at the differences between Java and Javascript, and see how they look like.

Read also: What is the difference between Typescript and Javascript?

What is Java?

Java is a general-purpose, class-based, object-oriented programming language designed to have few implementation dependencies. It was originally developed by James Gosling at Sun Microsystems and launched in 1995. Java has several applications in areas such as web development and mobile application development, being its main applications. In addition, it is also used in embedded systems, desktops and scientific applications. Java supports 3 billion devices worldwide, including computers, smartphones, printers, ATMs, home security systems, and more.

History of Java

  • The project was led by James Gosling, Mike Sheridan and Patrick Naughton.
  • Sun Microsystems launched it in 1995, and the public deployment was released as Java 1.0 in 1996.
  • It promises WORA (Write Once Run Anywhere) functionality that offers free running time on popular platforms.
  • The Java 1.0 compiler was rewritten in Java by Arthur van Hoff.
  • Java 2 was released in December 1998 with several configurations made for different platforms. It was later renamed Java EE, Java ME and Java SE.
  • In 1997, Sun Microsystems approached standardization bodies such as ISO / IEC JTC 1 and Ecma International to formalize it, but quickly withdrew from the process.
  • In November 2006, the JVM was launched.

Java features

  • Syntax simple and easy to learn.
  • Object oriented and follow OOP concepts such as inheritance, abstraction, polymorphism, encapsulation.
  • Strong because it is trying to remove the error-prone code. In addition, Java provides memory management and exceptions that have been mishandled by Garbage Collector and exception handling.
  • Independent platform tracking WORA functionality running on any platform using JRE (Java Runtime Environment)
  • A man, Java’s secure features allow us to develop virus-free and temperature-free systems.
  • Multithreading , the Java multithreading feature makes it possible to write programs to perform multiple tasks at once. Thus, it uses the same memory and other resources to run multiple threads simultaneously.
  • Neutral architecture, the compiler generates bytecode, which has nothing to do with a particular computer architecture.
  • High performanceJava enables high performance with the use of a just-in-time compiler.
  • distribution as programs can be designed to run on a computer network.

What is JavaScript?

JavaScript, also abbreviated as JS, is a high-level programming language, compiled just-in-time and multi-paradigm, that conforms to the ECMAScript specification. It consists of brace syntax, dynamic typing, prototype-based object orientation, and first-class functions. JS contributes to the core technologies of the World Wide Web, and large websites use it for customer page behavior. As a language with several paradigms. JS supports and enables an event-based, functional and imperative programming style for building interactive web pages. Provides APIs for working with text, data, regular expressions, data structures, and Document Object Model (DOM).

JavaScript history

  • In 1993, Mosaic Web Browser was launched, the first GUI browser
  • In 1994, Netscape Navigator launched a sophisticated web browser
  • In 1995, Netscape decided to add a scripting language to the browser to create dynamic web pages.
  • In September 1995, a new language and translator was created and originally called LiveScript, which was changed to JavaScript three months later.

JavaScript features

  • Object-centered scripting language: It supports features such as polymorphism, meaning that objects can have multiple shapes.
  • Technology Client Edge: Client refers to the web browser associated with the user. The client can have full control over the content, which is updated on the server thanks to Client Edge technology in Java Script.
  • User input validation: Form validation allows users to interact with customers by filling out forms through web pages.
  • Otherwise or IF Statement: To make logical expressions.
  • Interpreter focused: The scripting language is built with a centered interpreter, which allows the user to get results without using a compiler.
  • Ability to perform in Construction function: JS offers many built-in functions, such as isNAN (), Number (), parseFloat (), and parseInt ().
  • Capitalized sensitive format: Code written in format Uppercase or lowercase letters are treated in the same way.
  • Light and smooth: JavaScript does not include variables and uses only objects to perform operations, providing easy and complex code.
  • Statement loop: Performs the same operation over and over again, that is, the same code runs again and again for an unspecified or specified period of time.
  • Event management: Java Script has the ability to control the response on the site. It can control when the user tries to perform any operations managed by the server by the client, such as clicking on links and options, responding to interactions through websites, etc.

Similarities between Java and JavaScript

Object-oriented programming: Both languages ​​have access to OOP concepts, such as abstraction, inheritance, and polymorphism, which require developers to encode their objects and relationships in context with each other.

Front-end development: Java and JS expand their applications in frontend development. JS can be embedded directly into HTML, which is implemented as a framework or library, while Java is used as a Java Applet.

Back-end development: Both languages ​​provide server-side support. Java supports major backend technologies, such as JBoss, Apache, and WebSphere. Node.js serves JavaScript-based servers.

The difference between Java and JavaScript

Once you understand the basic understanding of Java and JavaScript. Now let’s see the difference between Java and JavaScript?

The programming paradigm

A significant difference between the two languages ​​is their programming paradigm, ie a programming language that addresses a problem in order to solve it. Java is an OOP language based on the concept of objects. On the other hand, JS is a multi-paradigm language and can be used as an OOP, procedural or scripting language.

Type check

The type check checks the “type” of the variable. JS is a dynamic language, meaning that the type of a variable is not known until the program is compiled. Instead, Java is a static typed language, so each variable must be associated with a type in the declaration.


The concept of inheritance allows an entity to inherit or acquire property from another entity. Java allows a class to get properties from another class. It also accepts multiple inheritance, meaning that one class can acquire properties from multiple classes. JS is based on the concept of prototypes and does not accept multiple inheritance.

Overload function

Function overloading allows a programming language to define two or more functions with the same name to perform different tasks. However, their functions differ depending on the arguments. Java supports overloading functions, while JS does not.


Multithreading reduces execution time by running more than one part of the program at a time, taking advantage of processor power. Java supports multithreading, while JS does not support it because the browser interpreter is single-threaded.

Java vs JavaScript

Parameter Java JavaScript
The programming paradigm Strictly object-oriented. Language is multi-paradigm. It can be used as OOP, procedural or scripting.
Type check Strongly typed, variable type must be determined before compilation. Poorly typed variable type is not known until compilation.
Execution of the code Java applications run in JVM or any browser. JS code is browser specific because it is developed for browsers only.
Object Class-based Java objects. JS objects are prototype based.
File extension java js
Memory usage More memory usage. Less memory usage.
Multithreading Supports multithreading. Does not support multithreading.
Language Independence Java is an independent language. JS is in web pages and embedded in HTML.
Approaching competition Java has a thread-based approach to competition. JS has an event-based approach to competition.
SEALANT It does not support closures. Supports closures.


So this is the difference between Java and JavaScript. In fact, Java and JavaScript are the most widely used languages ​​in the development industry. Both languages ​​offer OOP concepts such as abstraction, polymorphism to create interactive and secure web applications.

Learning Java and JavaScript is a good thing, because we can become a full stack developer if we master them. Because their languages ​​are almost different, one will be used for most backend applications and programs, while the other will be used to create web applications, the effects / interactive functions that use it may run in different browsers.

So many articles The difference between Java and JavaScript. Looking forward to more interesting articles and don’t forget to share this article with your friends. Thank you…

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