Question

Here is my code:

public class Test
{
   static 
   {
      main(null);
   }
   public static void main(String [] args)
   {
      System.out.println("done");
   }
}

I am getting the following output:

done 
done

Can somebody please explain me the reason for this?

Answer 1

What do you think unusual? The static block is executed once when the class is loaded (and it has to be loaded before executing main method. Then the main method itself is executed.

Check out this modified version:

public class Test {
    static {
        main(new String[]{"[done static]"});
    }

    public static void main(String[] args) {
        System.out.println(args.length > 0 ? args[0] : "[done]");
    }
}

It prints:

[done static]
[done]