Static block is not executing in JDK 7, “Main method not found”, but works in JDK 1.5

Question

I have written a simple class with one static block

class Hello
{

  static {
           System.out.println(\"Hello\");
       System.exit(0);
     }
}
         


        

Answer 1

Upto JDK1.6:-

It first load the class and while loading the class static block will be executed. and then check the main method to execute.

JDK1.7 onwards :

It checks main method first whether it is available or not.

if available
   then first execute static and
   then main method will be executed.

if not available
throw error