Java Hello World program
GD.java
class GD 
{
    public static void main(String[] args) 
    {
        System.out.println("Hello, World!");
    }
}
Output
godarda@gd:~$ javac GD.java
godarda@gd:~$ java GD
Hello, World!
godarda@gd:~$
Java program without using main function (only compilation)
GD.java
class GD
{
    static 
    {
        System.out.println("Hello World");
    }
}
Output
godarda@gd:~$ javac GD.java
godarda@gd:~$ java GD
Error: Main method not found in class GD, please define the main method as:
   public static void main(String[] args)
or a JavaFX application class must extend javafx.application.Application
godarda@gd:~$
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