Spring - A normal Spring appliation

You will have a interface like
public interface Vehicle{
   public void noOfWheels();
}

You will have classes implementing the interfaces
public class Car implement Vehicle{
 public void noOfWheels(){

}
}
public class Truck implement Vehicle{

public void noOfWheels(){


}

}

A Helper  Class

public class transport {
1)Vehicle vehicle;
2)setter for vehcile
public wheel(){
vehicle.noOfWheels();
}

}
A Calling Class
public class SpringDemo{

ApplicationContext app = new ClassPathApplicationContext ("spring.xml");
Transport transport= (Transport )app.getBean("transport");
transport.wheel();
}

Spring configuration file