JavaScript is a lightweight programming language (most commonly known as scripting language) developed by Netscape, Inc. It is used to make web pages interactive. It is not a part of the Java platform. Following is a list of some key differences between Java and JavaScript
A list of key differences between Java and JavaScript
| Java |
JavaScript |
| Java is a complete and strongly typed programming language used for backend coding. In Java, variables must be declared first to use in the program, and the type of a variable is checked at compile-time. |
JavaScript is a weakly typed, lightweight programming language (most commonly known as scripting language) and has more relaxed syntax and rules. |
| Java is an object-oriented programming (OOPS) language or structured programming languages such as C, C++, or .Net. |
JavaScript is a client-side scripting language, and it doesn't fully support the OOPS concept. It resides inside the HTML documents and is used to make web pages interactive (not achievable with simple HTML). |
| Java creates applications that can run in any virtual machine (JVM) or browser. |
JavaScript code can run only in the browser, but it can now run on the server via Node.js. |
| The Java code needs to be compiled. |
The JavaScript code doesn't require to be complied. |
| Java Objects are class-based. You can't make any program in Java without creating a class. |
JavaScript Objects are prototype-based. |
| Java is a Complete and Standalone language that can be used in backend coding. |
JavaScript is assigned within a web page and integrates with its HTML content. |
| Java programs consume more memory. |
JavaScript code is used in HTML web pages and requires less memory. |
| The file extension of the Java program is written as ".Java" and it translates source code into bytecodes which are then executed by JVM (Java Virtual Machine). |
The JavaScript file extension is written as ".js" and it is interpreted but not compiled. Every browser has a JavaScript interpreter to execute the JS code. |
| Java supports multithreading. |
JavaScript doesn't support multithreading. |
| Java uses a thread-based approach to concurrency. |
JavaScript uses an event-based approach to concurrency. |
