Difference between Java and JavaScript

Java is purely a programming language used by Java developers whereas JavaScript is a front end scripting language used by web developers.
Java is famous for server side programming and is the preferred choice for web development and mobile development.
JavaScript is considered as a client side programming language and in runs in the web browser to make the webpages look more responsive and dynamic.
Since node.js has been released in 2009, JavaScript is also considered as a server side language.

Some differences between Java and JavaScript are listed below:

  1. Java is a compile time programming language whereas JavaScript is an interpreted language.
    When we write Java code it is first compiled into bytecode and then it runs on a Java Virtual Machine, whereas JavaScript runs directly in a web browser.
  2. In Java, static type checking is used but the variable type is only checked at the compile time.
    Therefore, the programmer needs to specify the type of the variable such as string. integer, double, etc.
    In JavaScript dynamic typing is used where the type of variable is verified at the runtime.
    Therefore, the programmer does not need to specify the type of variable they create.
    The advantage of using dynamic type check is that the programmer can freely assign variable types at his own convenience.
  3. The sequence of instructions is executed differently in Java and JavaScript.
    Java has the capability to use multiple threads at the same time to perform different tasks.
    But in JavaScript only one thread is executed at a time based on a queue system called as node clustering.
    Here Java is generally faster than JavaScript since the thread memory sharing is faster.
  4. Java follows inheritance in a top to bottom approach where all the properties are defined within a class and then they are inherited by its child class.
    Whereas in JavaScript, all objects can directly inherit objects properties from other objects.
  5. Java has the capability to compile the program for any structural issues within the code using the IDE (Integrated development environment). but JavaScript cannot be compiled before and all the issues needs to be found out at the runtime itself.
    Therefore, the debugging capabilities are dependent on the execution environment in case of JavaScript.
  6. All the calculations in a Java Program are generally performed on the server side itself whereas JavaScript performs all the calculations on the client side itself. Therefore, JavaScript code is generally faster. Java programs take some time to process the calculations.
  7. JavaScript gets stored as source text on the client machine whereas Java code is stored as byte code.
  8. Java has restriction in its own sandbox whereas JavaScript can easily make dynamic changes by interacting with DOM.
  9. Java programs require a large amount of computer memory which can cause memory allocation issues. But in the case of JavaScript it uses less memory for the processing. Therefore, it is preferred in web pages to load the pages faster.

So these were some differences between Java and JavaScript. Both of them are very useful for programming and you can decide which one to use as per your project’s needs and requirements.



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