Java is an object-oriented programming language, this allows the application of OOPS concepts. It is a platform independent language that means it can be run on multiple platforms. It is based on the concept of “Write once, run anywhere”, as the intermediate code generated by Java Virtual Machine is machine independent. The intermediate code then needs to be compiled into the machine code by a Java compiler.


Features of Online Java Compiler

  • It can be accessed through any web browser
  • Easy to use interface and supports various libraries.
  • The syntax highlighting feature colours the elements of the code to increase readability.
  • Compiler’s Autocompletion feature accelerates coding by predicting already defined variables/functions and completing code.


Syntax Help 

Here we will be discussing the syntax of the Java programming language. After going through this section, you can write if-else statements,switch-case statements, for loops, while loops, and do while loops. We will be covering the basics of Java syntax here.

1. If-Else Statement:

If-else statements are used to make decisions. In case the control does not enter, if’s body else’s body is executed. Every if need not have an else.


if( some condition ){
//body of if
//body of else


2. Switch Statement:

The switch case statement is also a decision-making construct. This is particularly efficient when a single variable takes on multiple simple values. The default case is always executed.


case 1:
// body of case 1
case 2:
//body of case 2
// body of the default


3. For Loop:

For loop is a loop used in Java for writing looping statements. It has a simple syntax and is one of the most used loops.


for( //initializer ; //condition for looping  ; //change in loop control variable  ){
// body of for loop

4. While Loop:

While loop is also a type of loop used in Java. It is much simpler syntax-wise and seems much more customizable than for loop.


while(//condition for which the loop will run){
// Body of while loop


5. Do-While Loop:

The do-while loop is also a type of loop in Java. The do-while loop’s body is always executed for once.


//body of the do-while loop
while(//condition for looping);


Classes and Objects

In Java, everything is written in classes. A class is a blueprint of the object to be created. It has everything an object needs to have but has no allocated memory. An object is simply the memory allocation of a class.


Working of the Online Java Compiler

The working of the online java compiler is identical to that of a java compiler installed on your desktop. Online java compilers are often hosted on a server that is accessible to clients via web pages. These online java compilers take code and compile it using that compiler via a web page. At runtime, the java compiler parses (analyses) all of the language statements syntactically and then produces the output code in one or more sequential stages or "passes," ensuring that statements that refer to other statements are appropriately referred to in the final code.

It is the server's responsibility to parse the compilation result and disseminate it to the client who submitted the compilation request.

How to write and run the java programs online?

To write and run your java programs, you first need to write java programs in the java code editor. Select the version of java and save your code.  To run a java program online, go to an online java compiler, enter your java code in the editor, and then click the Run button. The compiler will then compile your code online and show you the results.

Let’s write a sample java program that prints - Welcome to Code360 Online Compiler. To do so, head over to the Online Java Compiler and write this code:

class Solution {
    public static void main(String[] args) {
        System.out.println("Welcome to Coding Ninjas Studio Online Compiler");


Benefits of using Online Java Compiler

The following are the benefits of using an Online Java Compiler:

  • Reduces System Load: You don't have to download software to use an online java compiler, which minimizes system load.
  • Collaborative: You may simply share your code link with colleagues or friends using the Online Java compiler and cooperate with them on a task.
  • Improved Performance: Online Java Compilers running on powerful machines are generally faster than local compilers.
  • Simple Interface: They generally come with a simple interface making it easier for any user to understand and use them easily.
  • Easily Accessible: The user can use an online java compiler from anywhere, making it easily accessible.



  • Compiler: A compiler is an essential tool that can be used locally or online for compiling a code, that is, converting the code to a machine based language for output.
  • Interpreter: An Interpreter is a tool that works similarly to a compiler, converting high level code into machine based language, but it converts the code line by line rather than in a single pass.
  • Online IDE: Online IDE, or Integrated Development Environment, is a software based tool that is used as a single platform for all kinds of computer programming. It consists of an integrated compiler or interpreter, extensions, dependency files, and a debugger. Example: Eclipse
  • Code Editor: A Code Editor is another essential part of computer programming. It is a place where all source codes can be created and modified. It can be a stand alone application or part of an IDE. Example: Vim and Sublime
  • Coding Ground: Coding Ground is a tool that provides easy accessibility to developers for using more than one programming language, technology, and framework. It allows developers to use various tools on a single platform.