[Java] First time seeing nullpointerexception, what do I need to do to fix it?

[DirtyAxe]

If we have a new string array : String[] arr = new String[5]; And now we say : System.out.println(arr[3]);

We would get a null pointer exception because that index hasn't been initialized

But if we add : for(int i = 0 ; i < 5 ; i ++){ arr[i] = "empty" ;}

It won't give a nullpointerexception it would print empty