A simple Java program

Estimated time to read: 1 minute

A simple Java program with main()¶

HelloWorld.java

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

public class HelloWorld {}

public	class	HelloWorld
Visible to the runtime	Type	Name

To be recognisable to Java, it must be in a file named 'HelloWorld.java'.

Class naming convention: words are separated by upper case letters.

Note

Java is case sensitive!.

 public static void main (string[] args)

public	static	void	main	(string[] args)
Visible to the runtime	Not reliant on having an instance or object providing data. All entrypoints are static.	The function / method does not return anything	The "main" entry point of the function	Arguments can be provided from the command line. These are added in, in this instance, as a string array.

System.out.println("Hello World");

System.out.println	("Hello World")	;
Standard method, Print Line	Data for method	End of Statement

- src
 - io.entityfour.academy
  - HelloWorld.java