Java - Thinking in Java 第8章 習題

標籤：mystra   java編程思想   第8章   習題   

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/** * 向上轉型 * <p/> * Created by wang on 15/8/7. */class Cycle {    public void play() {        System.out.println("Cycle play");    }}class Unicycle extends Cycle{    @Override    public void play() {        System.out.println("Unicycle play");    }}class Bicycle extends Cycle {    @Override    public void play() {        System.out.println("Bicycle play");    }}class Tricycle extends Cycle {    @Override    public void play() {        System.out.println("Tricycle play");    }}public class UpCast {    public static void ride(Cycle c) {        c.play();    }    public static void main(String[] args) {        Unicycle u = new Unicycle();        Bicycle b = new Bicycle();        Tricycle t = new Tricycle();        ride(u);        ride(b);        ride(t);    }}

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Java - Thinking in Java 第8章 習題