java 面向接口编程

public interface Advertisement { //接口
      public void showAdvertisement();
      public String getCorpName();
}

public class AdvertisementBoard { //负责创建广告牌
   public void show(Advertisement adver) {
       System.out.println(adver.getCorpName()+"的广告词如下:");
       adver.showAdvertisement(); //接口回调
   }
}

public class WhiteCloudCorp implements Advertisement { //PhilipsCorp实现Avertisement接口
   public void showAdvertisement(){
      System.out.println("@@@@@@@@@@@@@@@@@@@@@@");
      System.out.printf("飞机中的战斗机，哎yes!\n");
      System.out.println("@@@@@@@@@@@@@@@@@@@@@@");
   }
   public String getCorpName() {
      return "白云有限公司" ; 
   }
}

public class BlackLandCorp implements Advertisement { 
   public void showAdvertisement(){
      System.out.println("**************");
      System.out.printf("劳动是爹\n土地是妈\n");
      System.out.println("**************");
   }
   public String getCorpName() {
      return "黑土集团" ; 
   }
}

public class Example6_6 {
   public static void main(String args[]) {
      AdvertisementBoard board = new AdvertisementBoard();
      board.show(new BlackLandCorp());
      board.show(new WhiteCloudCorp());
   }
}