sandwich8.java

java编程思想第四版习题答案

// interfaces/Sandwich8.java
// TIJ4 Chapter Interfaces, Exercise 8, page 320
/* In polymorphism.Sandwich.java, create an interface called FastFood (with
* appropriate methods) and change Sandwich so that it also implements
* FastFood.
*/
package interfaces;
import static net.mindview.util.Print.*;

interface FastFood {
	void cheeseburger();
	void fries();
	void softDrink();
}

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 Sandwich8 extends PortableLunch implements FastFood {
	private Bread b = new Bread();
	private Cheese c = new Cheese();
	private Lunch l = new Lunch();
	public Sandwich8() { print("Sandwich8()"); }
	public void cheeseburger() {
		print("Cheeseburger");
	}
	public void fries() {
		print("Fries");
	}
	public void softDrink(){
		print("Soft Drink");
	}
	public static void main(String[] args) {
		Sandwich8 s = new Sandwich8();
		s.cheeseburger();
		s.fries();
		s.softDrink();

	}
}