BridgeTest.java

package JavaPatternDemos;


/**
 * 桥接模式
 *
 * 对于多维的概念，例如咖啡有大杯，小杯， 可以加糖，不加糖
 *
 * 使用桥模式在结构上衔接，实现组合
 *
 * 例如
 * 大杯加糖，价格 = 大杯咖啡 + 2倍糖价格
 * 小杯加糖： 价格 = 小杯咖啡 + 1倍糖价格
 *
 *
 */
public class BridgeTest {

 public static void main(String[] args) {
 Coffee small_sugar = new SmallCoffee(10,new Sugar());
 Coffee large_black_sugar = new LargeCoffee(15, new BlackSugar());

 small_sugar.addAdditions();
 large_black_sugar.addAdditions();

 small_sugar.sellCoffee();
 large_black_sugar.sellCoffee();
 }


}



abstract class Coffee{
 protected int price;
 protected Additions addition;

 public Coffee(int mPrice,Additions mAddition){
 price = mPrice;
 addition = mAddition;
 }
 public void sellCoffee(){
 System.out.println(this.price);
 };

 public abstract void addAdditions();
}

class LargeCoffee extends Coffee{
 public LargeCoffee(int mPrice, Additions mAddition) {
 super(mPrice, mAddition);
 }
 @Override
 public void addAdditions() {
 // 大杯咖啡加 2倍的钱
 addition.adding();
 this.price += (2 * addition.getPrice());
 }
}

class SmallCoffee extends Coffee{

 public SmallCoffee(int mPrice, Additions mAddition) {
 super(mPrice, mAddition);
 }

 @Override
 public void addAdditions() {
 addition.adding();
 this.price += addition.getPrice();
 }
}


interface Additions{
 void adding();
 int getPrice();
}


class Sugar implements Additions{

 @Override
 public void adding() {
 System.out.println("add sugar");
 }

 @Override
 public int getPrice() {
 return 2;
 }
}

class BlackSugar implements Additions{

 @Override
 public void adding() {
 System.out.println("add black Sugar");
 }
 @Override
 public int getPrice() {
 return 5;
 }
}