Learning Java And Javascript At The Same Time

In the realm of software development, two essential threads intertwine the world of programming: Java and JavaScript. Java and JavaScript have been long-standing players in the field and continue to be immensely popular to this day. Even if you only have a passing interest in programming, you are bound to come across these terms. While Java is used for developing applications for devices or browsers, JavaScript is employed in creating HTML documents and enhancing browsers. However, it’s easy to confuse the two. Some people may mistakenly think that Java is just a compact version of JavaScript, but this is not entirely accurate. Although there is some overlap between Java and JavaScript, they have distinct functionalities. The goal of this article is to untangle the concepts of Java and JavaScript and shed light on their differences.

What is Java?

Java is a versatile, class-based programming language used for building various applications, including web applications, mobile applications, and big data technologies. It incorporates object-oriented programming concepts such as inheritance, encapsulation, and abstraction to ensure secure and reliable programming. Java provides a comprehensive computing platform that includes a compiler, execution engine, libraries, and more for developing and running Java applications and programs.

An integral part of Java is the Java Virtual Machine (JVM). The JVM enables Java to convert bytecode into machine code. Bytecode is an intermediate code translated from the source code. This code runs on the JVM and can be interpreted by different machines, such as those running Linux, macOS, or Windows. JVM ensures that Java supports the “Write once, run anywhere” principle by providing adaptability across platforms.

These diverse platforms offer unique characteristics and features that assist programmers in building desktop and mobile web applications. Certain platforms are suitable for developing APIs, while others excel in graphic user interface development or offer high performance. Ultimately, the aim is to facilitate easy, fast, and secure development and execution processes for programmers.

Features of Java

  • Easy and Simple to Understand: Java is renowned for its simplicity. It shares a familiar code base with languages like C and C++, but with fewer complexities such as storage classes and operator overloading.

  • Platform-Independent: Java is a platform-independent programming language. It means that Java code can run on any machine, platform, or operating system. This is made possible by the Java Virtual Machine (JVM) and bytecode. Bytecode, the intermediate code converted from the source code, runs on the JVM, which allows execution on different platforms and operating systems.

  • Object-Oriented: Java fully supports object-oriented programming features and concepts such as encapsulation, abstraction, inheritance, etc. These OOP concepts provide several advantages, including security, prevention of data redundancy, easy troubleshooting, and more.

  • Compiled and Interpreted: Java combines the advantages of both compiling and interpreting code. It allows you to compile the source code into bytecode and interpret it on the JVM, making it executable on any machine or platform.

  • Secure and Reliable: Java includes various tools and features that make it a secure and reliable language for programmers and developers. It offers secure communication, public key infrastructure, authentication, cryptography, and more, providing a robust framework for developers.

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What is JavaScript?

JavaScript is a scripting language used for client-side development, enhancing static web pages and applications to provide an interactive user experience. JavaScript allows dynamic features to be added to web pages and applications, including interactive forms, auto-updates, autocomplete text suggestions, animation graphics, slideshows, and more. JavaScript brings life and action to otherwise dull and static pages. It is one of the fundamental front-end languages, along with HTML and CSS.

However, with the recent introduction of Node.js, JavaScript can now be used for server-side or backend development as well. This expansion of usability highlights the versatility of JavaScript.

JavaScript can be used for:

  • Adding interactive, functional elements to web pages
  • Developing web-based games
  • Creating mobile applications
  • Back-end or server-side development

Features of JavaScript

  • Front-end Scripting Language: JavaScript is a front-end language that doesn’t require extensive functions to run on browsers. Unlike server languages like PHP or ASP.NET, JavaScript doesn’t need server assistance for simple tasks. This saves a lot of time when performing repetitive tasks.

  • Lightweight: JavaScript is a lightweight scripting language. With minimalistic features and characteristics, it is easy to implement and runs without excessive calculations, preventing an unnecessary load on the RAM and processor.

  • Prototype-Based Language: JavaScript is a prototype-based language, which means it uses prototypes of objects to create more objects. In contrast, Java defines classes first and then creates objects.

  • Default Parameters: JavaScript includes the feature of default parameters, which helps secure a programmer’s code from failure due to simple mistakes. Default parameters act as a safety net in case a parameter isn’t defined, preventing errors.

  • User’s Input: JavaScript takes into account user input for error-checking. For example, if a user leaves a field empty or enters incorrect information while filling out a form, the code will not run. Validating user input saves time during error checking and debugging.

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Java vs JavaScript: Difference and Comparison

The primary difference between Java and JavaScript lies in their nature: Java is an object-oriented programming language (OOP), while JavaScript is an object-oriented programming script. JavaScript code is purely text-based and only requires translation. On the other hand, Java needs to be compiled.

Take a look at the table below for a more comprehensive comparison:

java vs javascript

Before making a final judgment on which language is better in the JavaScript vs Java battle, it’s essential to have a clear understanding of the benefits and drawbacks of both languages.

Advantages of Java and JavaScript

Advantages of Java

  • WORA (Write Once Run Anywhere): Java’s portability, achieved through compilation and interpretation, allows code to be written once and run anywhere. You only need to write the source code, which will be converted to bytecode on the JVM for interpretation on any machine or operating system.

  • Robust and Secure: Java’s features make it one of the most secure platforms for application development. For example, it does not support explicit pointers or robust security measures, minimizing unauthorized access and cyberattacks.

  • Automatic Garbage Collection: Java’s automated garbage collection feature prevents unused objects from occupying unnecessary space. It automatically cleans up objects that are no longer in use, optimizing memory usage.

  • Multi-Threading: Java supports multi-threading, enabling simultaneous execution of tasks. Threads are units of processes, and Java can run multiple threads at the same time.

Advantages of JavaScript

  • Frameworks: JavaScript boasts powerful frameworks that enhance web development. Frameworks provide collections of code that programmers can use to add various features and functionalities to websites and applications.

  • Browser-Control: JavaScript primarily runs on the browser, giving it more control and reducing server load. It offers efficiency in writing and implementing code, validation, and user input.

  • Speed: JavaScript’s execution directly on the browser enables a rapid development process. It minimizes the reliance on server support, even for basic calculations, thus increasing efficiency and saving time.

Disadvantages of Java and JavaScript

Disadvantages of Java

  • Performance: Java is not as fast as native or peer languages like C++ and C. The additional tasks of compilation and interpretation contribute to slower performance. Java also has high memory consumption, which puts a heavy load on the CPU and reduces efficiency.

  • Memory Management: While automatic garbage collection is beneficial, it can also be a drawback for Java. Garbage collection puts a strain on the processor and holds up the execution of other threads, increasing the overall task completion time.

  • Backup: Java lacks robust data backup capabilities. While it offers features for storing and collecting data, it doesn’t provide a strong backup facility.

  • Look and Feel: Java provides frameworks and GUI builders for creating user interfaces, but they may not be suitable for building highly complex interfaces. Frameworks like JavaFX and Swing offer limited functionality for front-end development.

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Disadvantages of JavaScript

  • Front-end Security: As JavaScript is a client-side scripting language, its code runs on the browser, making it vulnerable to third-party access. This can compromise the integrity and security of the code.

  • Browser Support: JavaScript’s standardized version allows it to run on any browser and platform, but this also leads to inconsistencies. Running the same code on different browsers like Safari and Mozilla Firefox can produce different outputs and functionalities, affecting quality and speed.

  • Time Consumption: JavaScript’s versatility and complex functionalities can take up considerable time in converting functions into machine-understandable code. This can impact performance and reduce website speed, potentially discouraging users from utilizing the site.

JavaScript vs Java: Which One is Better?

After a thorough examination, it’s clear that neither language is superior to the other. JavaScript shines as a front-end scripting language with powerful frameworks for creating interactive GUIs. On the other hand, Java is a stand-alone language known for its speed, security, and reliability in server-side development. It offers extensive libraries, efficiency, and robust security features for creating mobile applications, desktop applications, games, and web-based applications.

Ultimately, the choice between JavaScript and Java depends on the nature of your project and its requirements. Consider what you are developing and what each language offers before making a decision.


Q.1: Is JavaScript easier than Java?

A: Yes, JavaScript is generally considered easier to learn than Java. It requires fewer tools and prior knowledge of development kits. To start writing code for web development with JavaScript, all you need is a text editor and programming knowledge.

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

A: Learning Java first is usually recommended, but JavaScript is relatively easier to learn. Ultimately, the choice depends on your personal preference and the requirements of your project.

Q.3: How is JavaScript different from Java?

A: There are several differences between Java and JavaScript, but the key distinction lies in their nature and usage. JavaScript is a scripting language primarily used on browsers to add functionality to static pages. On the other hand, Java is a server-side language that needs to be compiled into bytecode and executed on the Java Virtual Machine (JVM) to create and run applications and programs.

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

A: Yes, you can learn JavaScript without knowing Java. The two languages are distinct and serve different purposes. JavaScript is mainly used for front-end development, such as web-based applications or GUI desktop applications. Java, on the other hand, is used for server-side or backend development, creating desktop, mobile, and web-based gaming applications.

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