Difference between Java and JavaScript

java vs javascript

Java and JavaScript have long been misunderstood by new programmers and non-technical people, yet the only thing they have in common is the word “Java.” Each is a valuable programming language in its position, each with its own set of advantages. Programmers utilize both JavaScript and Java for a range of jobs, this one isn’t fundamentally better than the other.

What is JavaScript?

Netscape Navigator and Internet Explorer were the most widely used web browsers in the early days of the Internet, before 1990. Netscape, Inc. worker Brendan Eich created a programming language in just 10 days that could teach the computer how to communicate with a user based on user inputs. This programming language, which they dubbed “LiveScript,” was built into Navigator.

To put it another way, the browser was interpreting the user’s commands rather than compiling the code; a plug-in was not necessary. At the same time, Java, although it required a specialized plug-in to function, was growing in popularity. JavaScript was born as a result of Netscape’s vision. In the first days of the Internet, JavaScript was essential.

Advantages of JavaScript

•         It’s a Microsoft-sponsored open-source project.

•         A tool created specifically for short scripts.

•         Classes, Interfaces, and bundles are all supported.

•         Compile JavaScript and it will work in any browser.

•         Cross-compilation is possible.

•         You can use JavaScript to develop big apps by extending them.

•         JavaScript can be used to save and retrieve data on the user’s machine.

•         Providing visitors with immediate feedback

•         It enables you to develop user interfaces that respond when the mouse hovers over.

Disadvantages of JavaScript                                 

•         Client-side the reading and writing of files are not possible with JavaScript. For security purposes, it has been maintained.

•         Because there isn’t much support for JavaScript in networking apps, it can’t easily be applied.

•         JavaScript does not support multithreading or multiprocessing.

What is java?

Developed by Sun Microsystems, Java is a programming language created by James Gosling and patented by Sun. In reality, it took a lot longer than 10 days to build. It wasn’t until 1991 that a group of Sun Microsystems engineers is known as the “Green Team” worked around the clock to develop Java. There have been numerous updates since its initial release in 1995. Today’s Internet is rife with Java-powered applications, and Java is to blame for many of the conveniences we enjoy daily. Oracle is the current owner of the Java brand.

Advantage of Java

•         There is comprehensive documentation available.

•         There is a vast pool of experienced developers available.

•         It enables you to create standard programs and code that may be reused.

•         It’s a multi-threaded framework that enables you to run multiple programs at the same time.

•         Outstanding performance

•         Libraries are simple to navigate

Disadvantages of Java

•         The JIT compiler slows down the program; Java has large processing and memory requirements. As a result, hardware costs rise.

•         Pointers and other low-level programming constructs are not accessible.

•         You have no control over trash collection since Java lacks delete () and free () functionalities.

Major Similarities of java and JavaScript:

It’s worthwhile to keep in mind that Java and JavaScript have certain top-level similarities when evaluating web app development.

1.      Objective-oriented Techniques (OOP):

When coding in both languages, the developer must think about how objects and their relationships fit into the wider context. Both languages can benefit from technologies like encapsulation, inheritance, and polymorphism as a result of it being extended.

2.      Development of the front-end:

 Front-end development can benefit from the use of both languages. As a framework or library, JavaScript can be inserted directly into HTML, while Java can be utilized as a Java applet.

3.      Development of the back-end:

Server-side, both languages can be applied. Back-end technologies like JBoss, Apache, and Web Sphere have long relied on Java. The Node.js platform has become a starting point for JavaScript-powered web servers.

Primary differences between java and JavaScript:

1.      Java is a tightly typed language, whereas JavaScript is a flexibly typed language. In JavaScript, we must declare variables using set objects before using them, however in Java; we can flexibly utilize a variable.

2.      Java is an interpreted and compiled programming language that runs on JVM and requires JRE and JDK, meanwhile, JavaScript is an interpreted programming language that runs in a browser and is a text file.

3.      Java bytecode is platform-independent, while JavaScript code is built for browser support. Some code may only work on certain browser versions and not on other versions of the same browser.

4.      JavaScript is a dynamically typed language, but Java is a statically typed language, in which variables are specified with the data type at compile-time, and JavaScript can take a variety of data types.

5.      A constructor is supported in Java, while a constructor is a function in JavaScript, and there are no rules for constructors in JavaScript as there are in Java.

6.      Java is a class-based programming language, while JavaScript is a prototype-based language of programming with object-oriented capabilities.

7.      Semicolons are used at the end of some lines in JavaScript, but not at the end of non-block statements.

8.      JavaScript has an implicit global reach, but Java has an implicit class extent.

9.      Java supports a variety of numeric data types, while JavaScript focuses on floating-point data.

10.  A switch structure in Java accepts just constants, while a switch structure in JavaScript allows any values.

11.  Annotations on classes are supported in Java, although decorators on the same definitions in JavaScript have different semantics.

12.  Closures are supported in JavaScript, allowing us to send a function as an argument to another function; however, this may be accomplished using an anonymous class in Java.

13.  Java supports the Enum data type, which allows us to declare a set of constants, while JavaScript does not allow us to create a set of constants.

14.  We can modify or edit the actual code and use both JavaScript and Java languages because they are open source by definition. Java uses a thread-based method for concurrency, while JavaScript uses an event-based approach.

15.  In terms of projects created within the last 5 years on GitHub developers, JavaScript is more popular.


I hope that this post serves as a definitive guide to the differences between JavaScript and Java. Now, if you’re bored of reading/researching web app development and you’re short on time, I suggest reading this post, which I believe will save you time. Today, software development organizations throughout the world use both of these programming languages to build safe, scalable, and feature-rich programs that meet the needs of businesses.