Difference between Java and JavaScript – GeeksforGeeks

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JavaScript is a lightweight programming language(“scripting language”) and is used to make web pages interactive. It can insert dynamic text into HTML. JavaScript is also known as the browser’s language. JavaScript(JS) is not similar or related to Java. Both the languages have a C-like syntax and are widely used in client-side and server-side Web applications, but there are few similarities only.

Features of Javascript are as follows: 

  • JavaScript was created in the first place for DOM manipulation. Earlier websites were mostly static, after JS was created dynamic Web sites were made.
  • Functions in JS are objects. They may have properties and methods just like another object. They can be passed as arguments in other functions.
  • Can handle date and time.
  • Performs Form Validation although the forms are created using HTML.
  • No compiler is needed.

Example: This is the basic Javascript example. 

Tóm Tắt

HTML




<script>

    console.log("Welcome to GeeksforGeeks Learning");

</script>







Output:




Welcome to GeeksforGeeks Learning


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. Java promised, “Write Once, Run Anywhere”.


Features of Java are as follows: 


1. Platform Independent: The compiler converts source code to bytecode and then the JVM executes the bytecode generated by the compiler. This bytecode can run on any platform.


2. Object-Oriented Programming Language:  Organizing the program in the terms of collection of objects is a way of object-oriented programming, each of which represents an instance of the class. There are 4 pillars of OOP’s concept:


    

  • Abstraction
    • 

  • Encapsulation
    • 

  • Inheritance
    • 

  • Polymorphism
    • 



3. Simple: Java is one of the simple languages as it does not have complex features like pointers, operator overloading, multiple inheritances, and Explicit memory allocation.


4. Robust: Java language is robust which means reliable. It is developed in such a way that it puts a lot of effort into checking errors as early as possible, that is why the java compiler is able to detect even those errors that are not easy to detect by another programming language.


5. Secure: In java, we don’t have pointers, and so we cannot access out-of-bound arrays i.e it shows ArrayIndexOutOfBound Exception if we try to do so.


6. Distributed:  We can create distributed applications using the java programming language. Remote Method Invocation and Enterprise Java Beans are used for creating distributed applications in java.


7. Multithreading: Java supports multithreading. It is a Java feature that allows concurrent execution of two or more parts of a program for maximum utilization of the CPU.


Example: This is the basic Java program.


Java





















import java.io.*;


 




class GFG {


 


    


    public static void main(String[] args)


    {


        


        System.out.println(


            "Welcome to GeeksforGeeks Learning");


    }


}












Output


Welcome to GeeksforGeeks Learning



The difference between Java and JavaScript is as follows: 


JavaJavaScriptJava 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.Objects of Java are class-based even we can’t make any program in java without creating a class.JavaScript Objects are prototype-based.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 timeJava 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 backendJavascript is used for the frontend and backend both.Java uses more memoryJavascript uses less memory.Java requires a Java Development Kit(JDK) to run the codeJavascript requires any text editor or browser console to run the code










My Personal Notes


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