Java is an object-oriented programming language and has a virtual machine platform that allows you to create compiled programs that run on nearly every platform. JavaScript is a lightweight programming language(scripting language) and is used to make web pages interactive. It can insert dynamic text into HTML.
The difference between Java and JavaScript is as follows
| Java | JavaScript |
|---|---|
| Java is a strongly typed language and variables must be declared first to use in the program. In Java, the type of a variable is checked at compile-time. | JavaScript is a loosely typed language and has a more relaxed syntax and rules. |
| Java is an object-oriented programming language. | JavaScript is an object-based scripting language. |
| Java applications can run in any virtual machine(JVM) or browser. | JavaScript code used to run only in the browser, but now it can run on the server via Node.js. |
Java program has the file extension .Java and translates source code into bytecodes which are executed by JVM(Java Virtual Machine). | JavaScript file has the file extension .js and it is interpreted but not compiled, every browser has the Javascript interpreter to execute JS code.if compile time |
| Java is a Standalone language. | contained within a web page and integrates with its HTML content. |
| Java has a thread-based approach to concurrency. | Javascript has an event-based approach to concurrency. |
| Java supports multithreading. | Javascript doesn’t support multi-threading. |
| Java is mainly used for backend | Javascript is used for the frontend and backend both. |
| Java uses more memory | Javascript uses less memory. |
| Java requires a Java Development Kit(JDK) to run the code | Javascript requires any text editor or browser console to run the code |