Java Object-oriented polymorphism

1. polymorphic package Com.yuanzijian02;public class Polytest {public void run (car car) {Car.run ();} public static void Main (string[] args) {//TODO auto-generated method stub polytest test = new Polytest (); Car car = new BWM (); Test.run (car);//downward type conversion QQ QQ = new QQ (); Test.run (QQ);}} Class Car {public void run () {System.out.println ("Car is runing");}} Class BWM extends Car{public void run () {System.out.println ("BWM is runing");}} Class QQ extends car{public void run () {System.out.println ("QQ is Running");}}

Java Object-oriented polymorphism