日期:2014-05-20 浏览次数:20964 次
class Meal {
  Meal() { print("Meal()"); }
}
class Bread {
  Bread() { print("Bread()"); }
}
class Cheese {
  Cheese() { print("Cheese()"); }
}
class Lettuce {
  Lettuce() { print("Lettuce()"); }
}
class Lunch extends Meal {
  Lunch() { print("Lunch()"); }
}
class PortableLunch extends Lunch {
  PortableLunch() { print("PortableLunch()");}
}
public class Sandwich extends PortableLunch {
  private Bread b = new Bread();
  private Cheese c = new Cheese();
  private Lettuce l = new Lettuce();
  public Sandwich() { print("Sandwich()"); }
  public static void main(String[] args) {
    new Sandwich();
  }
}