JavaTutorial

Basic Syntax:

public class Main {
    public static void main(String[] args) {
        System.out.println("Hello World");
    }
}

This is a basic program which prints "Hello World!" on screen.
Let us, split the code and understand it line by line.

• public class Main - defines a class names Main which is public. In Java, we have to work with classes. The Main class is the entry point for our program.


• public static void main(String[] args) - it is a special method inside main class. The execution of our code starts from main method.
  
  1. public : access modifier written before the main function shows that it is a public function which means that we can access this function anywhere within our java program.
  2. static : indicated that the method belongs to class itself.
  3. void : means that the function is not returning any value.
  4. main : name of the method.
  
  
• String[] args :This is the parameter to the main function which allows us to pass command line argumentsto our program when we run it.


• System.out.println("Hello World"); : This is the actual line of code which is getting executed.
  1. System : buil-in class in Java.
  2. out : static field with System class which represents standard output stream.
  3. println("Hello World"); : This is the method call on out object. It prints text "Hello World!" on screen.

Note : We have to take care about semi-colon. We have to put semi-colon at the end of every expression. If you do not put semi-colon at the end of every expression, you are going to get an error.