Java & JavaScript compared

Created by
Thursday, August 25, 2016

Java and JavaScript are both Object Oriented Programming languages. JavaScript is an object oriented scripting language. They are completely different programming languages with a small number of similarities. JavaScript is mainly used in Web pages. Almost all Java expression syntax and naming conventions are followed by JavaScript. This is the main reason for calling it JavaScript. Unlike Java, JavaScript does not bother about the methods, variables and classes at all. Java is much more complex than JavaScript. Let us compare Java and JavaScript in detail.


Java is an Object Oriented Programming language. It is created by Sun Microsystems. Initially Java was known as Oak, but in 1995 it was renamed as Java. Now a days it has been merged into Oracle Corporations. The main advantage of Java is that we need to run its code once and after that we can run it anywhere, in other words also the tag line of Java. Its code can be run on any platform providing the environment to run it. The Java Virtual Machine has the responsibility of running Java code anywhere. Java is considered as a universal computer language. It is designed similar to C++, but with easier syntax to understand. Java is also known for its security terms. It is a very secure language. Java is used for creating and running web servers, word processors, code editors and so on. Java also provides applets that run inside our browser. They are not incorporated in our browsers like other programs. Now a days applets are rarely used by programmers because of some security flaws in them.


As far as JavaScript is concerned, we can think it as a part of our browser. It is an object oriented scripting language and was created by Netscape. It is a light weight language. Its name caused confusion with the name Java. Initially it was known as LiveScript. It is built into our browser. First it was used in Netscape browsers. JavaScript is easy to learn because its syntax is similar to that of HTML. It is different from HTML in that it is object oriented. Its code can be inserted into HTML pages. It is used to control the look and feel of the web pages. Generally all modern websites use JavaScript. In JavaScript objects can be plotted through method acting. We can also change the properties with method acting. Functions are supported in JavaScript without any declarative requirements.


  • In Java, the source code is first converted into an intermediate code, known as the byte code. This byte code is non-readable by humans and is independent of any machine. Afterwards, this byte code is interpreted by the interpreter (Java Virtual Machine). Since JavaScript is a scripting language, it is only interpreted. This is why making the changes in a Java program are more complex than making the changes in a JavaScript program.
  • Java needs the Java Development Kit. JavaScript mainly requires a text editor.
  • Java is a strongly typed language. On the other hand, JavaScript is a loosely typed language.
  • In a Web environment, JavaScript is a front-end language, whereas Java is a back end language.
  • JavaScript is considered as a part of HTML file, so it is visible in the source file. Java applets are not a part of HTML file so they are not visible in the source file.
  • Java is very complex to learn due to its rules and restrictions whereas JavaScript is very easy to learn, as compared to Java.
  • The User Interface of JavaScript is developed in HTML and is very easy to understand, whereas the User Interface of Java is developed in AWT or Swing, which is very complex to understand.
  • The client-side is more secured in Java compared to JavaScript.
  • In Java and JavaScript, routines are known as the methods and functions respectively.
  • Java supports Polymorphism, but JavaScript does not support Polymorphism.
  • Java uses the classes and objects to make its code reusable easily, but this service is not available in JavaScript.

Similarities between Java and JavaScript

  • Java and JavaScript both can run on the server.
  • Java and JavaScript both can run on a browser.
  • Java and JavaScript both have frameworks and libraries.
  • Java and JavaScript both cannot be written automatically to hard disk drive.
  • Java and JavaScript both are used to upgrade the web pages.
  • Java and JavaScript both have some level of security built into it.
  • Java and JavaScript both can run on the client's side.


Advantages of JavaScript over Java

  • A basic knowledge of HTML is sufficient for JavaScript.
  • Editing is easier in JavaScript compared to Java.
  • It is easier, adaptable and more robust than Java and even a common man can easily understand it.
  • It is faster than Java.
  • Only a text editor is sufficient to work with JavaScript.


Disadvantages of JavaScript over Java

  • JavaScript is less flexible than Java.
  • Different browsers need different versions of JavaScript.
  • JavaScript is less secure than Java.
  • Due to the absence of a compiler in JavaScript you do not know your mistakes while writing.
  • JavaScript is a loosely typed language so it does not provide type safety.
  • It does not have a standard way of writing it.
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