bash-4.2$ cat HelloCWorlds.java
class HelloCWorlds{static{char[]a=HelloCWorlds.class.getName().toCharArray();int
x=a.length,y=a[--x]%x;a[y]/=x/y;a[x]=a[y]--;System.out.print(a);}}

bash-4.2$ javac HelloCWorlds.java

bash-4.2$ java -version
java version "1.7.0_09"
OpenJDK Runtime Environment (IcedTea7 2.3.3) (build 7-6-i686)
OpenJDK Server VM (build 23.2-b09, mixed mode)

bash-4.2$ java HelloCWorlds
Error: Main method not found in class HelloCWorlds, please define the main method as:
   public static void main(String[] args)

bash-4.2$ java HelloCWorlds 2>/dev/null

bash-4.2$ /usr/lib/java/jre/bin/java -version
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) Server VM (build 20.1-b02, mixed mode)

bash-4.2$ /usr/lib/java/jre/bin/java HelloCWorlds
Hello World!Exception in thread "main" java.lang.NoSuchMethodError: main

bash-4.2$ /usr/lib/java/jre/bin/java HelloCWorlds 2>/dev/null
Hello World!