Android : How switch statement in FragmentPagerAdapter's getItem() work?

Have a look at this code :

@Override
    public Fragment getItem(int index){

       Log.i("Tab position", String.valueOf(index));
        switch (index) {
        case 0:
            // Top Rated fragment activity
            return new TopRatedFragment();
        case 1:
            // Games fragment activity
            return new GamesFragment();
        case 2:
            // Movies fragment activity
            return new MoviesFragment();
        }

        return null;
    }    

       @Override
        public int getCount() {
            // TODO Auto-generated method stub

            return 3;
        }

ViewPager works fine but how ?

1. 
   

   When i start my app i get following Logcat with TabPosition 0 and 1:

   
   

   09-16 15:28:20.353: I/Tab position(2737): 0 09-16 15:28:20.372: I/Tab position(2737): 1

   
   


2. 
   

   Now when i select second Tab or swipe to second page i get following Logcat with TabPosition 2:

   
   

   09-16 15:28:29.072: I/Tab position(2737): 2

   
   


3. 
   

   when i select third Tab or swipe to third page then there is no Logcat and TabPosition not printed :

   
   

My confusion is I know that index returned by getItem() is not a position of current selected Page or Tab but it is a position of pages that need to be rendered.

But if this is a case then how switch statement returns correct Fragment although index is not correct one.

For example :

Initially there are two indexes returned by getItem() 0 and 1, now how switch statement decides to select 0 or 1.

I hope you understand question.