设计模式-结构型-桥接模式

1、定义

桥接模式：将抽象部分与实现部分分离，使他们都可以独立进行变化

写法

/**
 * 添加物
 */
public abstract class CoffeeAdditives {

    public abstract String addSomething();

}

/**
 * 咖啡制造
 */
public abstract class Coffee {

    protected CoffeeAdditives impl;

    public Coffee(CoffeeAdditives impl) {
        this.impl = impl;
    }

    public abstract void makeCoffee();
}

public class LargeCoffee extends Coffee{

    public LargeCoffee(CoffeeAdditives impl) {
        super( impl );
    }

    @Override
    public void makeCoffee() {
        System.out.println("大杯的" + impl.addSomething() + "咖啡");
    }
}

public class SmallCoffee extends Coffee{

    public SmallCoffee(CoffeeAdditives impl) {
        super( impl );
    }

    @Override
    public void makeCoffee() {
        System.out.println("小杯的" + impl.addSomething() + "咖啡");
    }
}

public class Sugar extends CoffeeAdditives {
    @Override
    public String addSomething() {
        return "加糖";
    }
}

public class Ordinary extends CoffeeAdditives {
    @Override
    public String addSomething() {
        return "原味";
    }
}

public class TestMain {

    /**
     *
     * 桥接模式
     */
    public static void main(String[] args) {

        CoffeeAdditives sugar = new Sugar();
        CoffeeAdditives ordinary = new Ordinary();

        //大杯咖啡  原味
        LargeCoffee largeCoffeeOrdinary = new LargeCoffee(ordinary);
        largeCoffeeOrdinary.makeCoffee();

        //小杯咖啡  原味
        SmallCoffee smallCoffeeOrdinary = new SmallCoffee(ordinary);
        smallCoffeeOrdinary.makeCoffee();

        //大杯咖啡  加糖
        LargeCoffee largeCoffeeSugar = new LargeCoffee(sugar);
        largeCoffeeSugar.makeCoffee();

        //小杯咖啡  加糖
        SmallCoffee smallCoffeeSugar = new SmallCoffee(sugar);
        smallCoffeeSugar.makeCoffee();
    }

}

代码示例

https://github.com/yinlingchaoliu/23-design-pattern