Java Syntax - datacouch-io/spark-java GitHub Wiki

1. The main method

The main() method is an essential component present in every Java program:

public  static  void  main(String[] args)

Any code enclosed within the main() method's block will be executed. You don't need to fully comprehend the keywords preceding and following main() immediately; your understanding will develop gradually as you proceed through this tutorial.

For now, remember:

• Every Java program must have a class name that matches the filename.
• Each program must include the main() method.

2. System.out.println()

Within the main() method, we utilize the println() method to display a line of text on the screen:

println is an abbreviation for "print line." Whenever we wish our program to output a message to the screen, we employ System.out.println().

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

3. String[] args

String[] args acts as a receptacle for information we intend to provide to our program.