cookout.java

程序练习中包括书中实例程序代码和练习中要用到的代码,是压缩文件

abstract class Barbeque {
   public abstract void ignite();
   public void cook() {
      System.out.println( "put food on the "
                         +"grill and wait" );
   }
}
class GasBarbeque extends Barbeque {
   public void ignite() {
      System.out.println( "turn on gas and "
                          + "light match" );
   }
}
class CharcoalBarbeque extends Barbeque {
   public void ignite() {
      System.out.println( "pour on lighter "
                        + "fluid and light match" );
   }
}
public class Cookout {
   public static void makeDinner( Barbeque b ) {
      b.ignite();
      b.cook();
   }
   public static void main( String[] args ) {
      GasBarbeque gb = new GasBarbeque();
      CharcoalBarbeque cb = new CharcoalBarbeque();
      makeDinner( gb );
      makeDinner( cb );
   }
}