Define a Change Listener for a Query

Main.java

// Define Change listener for query
hallOfFameQuarterBackQuery.setChangeListener(new QueryListener<Player>() {
    @Override
    public void onItemUpdated(Player item) {
        System.out.println("Player " + item.getFirstName() + " " + item.getLastName() + " has been updated!");
    }

    @Override
    public void onItemAdded(Player item) {
        System.out.println("Player " + item.getFirstName() + " " + item.getLastName() + " has been added!");
    }

    @Override
    public void onItemRemoved(Player item) {
        System.out.println("Player " + item.getFirstName() + " " + item.getLastName() + " has been removed!");
    }
});