设计模式java——桥接模式

桥接模式（Bridge）：将抽象部分与它的实现部分分离，使它们均可以独立地变化。

桥接模式Demo：

/**
 * 2018年4月5日下午9:32:03
 */
package com.Designpattern;

/**
 * @author xinwenfeng
 *
 */
public class TestBridge {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Shop supermarket = new Supermarket();
		Shop smallshop = new SmallShop();
		Fruit apple = new Apple();
		Fruit lemon = new Lemon();
		supermarket.setFruit(apple);
		supermarket.sellFruit();
		supermarket.setFruit(lemon);
		supermarket.sellFruit();
		System.out.println("=======================");
		smallshop.setFruit(apple);
		smallshop.sellFruit();
		smallshop.setFruit(lemon);
		smallshop.sellFruit();
	}

}
interface Fruit{
	String getName();
	float getPrice();
}
class Apple implements Fruit{
	
	public String getName() {
		return "苹果";
	}
	
	@Override
	public float getPrice() {
		return 4.4f;
	}
	
}
class Lemon implements Fruit{

	public String getName() {
		return "柠檬";
	}
	
	@Override
	public float getPrice() {
		return 6.6f;
	}
	
}
abstract class Shop{
	protected Fruit fruit;
	public void setFruit(Fruit f) {
		fruit = f;
	}
	abstract void sellFruit();
}
class Supermarket extends Shop{

	@Override
	void sellFruit() {
		float price = fruit.getPrice() * 1.2f;
		System.out.println("超市的"+fruit.getName()+"单价（元）："+price);
	}
	
}
class SmallShop extends Shop{

	@Override
	void sellFruit() {
		float price = fruit.getPrice() * 1.3f;
		System.out.println("小商店的"+fruit.getName()+"单价（元）："+price);
	}
	
}

结果：