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