What does the following program output? For each bird’s output, describe how the output is generated (be specific).

public class Bird {} public class Turkey extends Bird { public String toString() { return "gobble, gobble"; } } // end class Turkey public class BirdDriver { public static void main(String[] args) { Bird tweety new Bird(); Turkey tommy = new Turkey(); System.out.println( "tweety = " + tweety + "; tommy = } // end main } // end class BirdDriver " + tommy);