设计模式之桥接模式(未使用桥接模式、使用桥接模式、源码体现)

/**
 * 咖啡接口：可以加奶加糖
 */
public interface Coffee {
    void add();
}

public class MCoffeeSugar implements Coffee {
    @Override
    public void add() {
        System.out.println("美式加糖");
    }
}
class MCoffeeMilk implements Coffee {
    @Override
    public void add() {
        System.out.println("美式加奶");
    }
}
class latteCoffeeSugar implements Coffee {
    @Override
    public void add() {
        System.out.println("拿铁加糖");
    }
}
class latteCoffeeMilk implements Coffee {
    @Override
    public void add() {
        System.out.println("拿铁加奶");
    }
}

public static void main(String[] args) {
    /**
     * 结果为：
     * 美式加奶
     * 美式加糖
     * 拿铁加糖
     * 拿铁加奶
     */
    MCoffeeMilk mCoffeeMilk = new MCoffeeMilk();
    mCoffeeMilk.add();
    MCoffeeSugar mCoffeeSugar = new MCoffeeSugar();
    mCoffeeSugar.add();
    latteCoffeeSugar latteCoffeeSugar = new latteCoffeeSugar();
    latteCoffeeSugar.add();
    latteCoffeeMilk latteCoffeeMilk = new latteCoffeeMilk();
    latteCoffeeMilk.add();
}

public class Milk implements CoffeeAdd{
    @Override
    public String add() {
        return "加奶";
    }
}

public class Sugar implements CoffeeAdd{
    @Override
    public String add() {
        return "加糖";
    }
}

public interface CoffeeAdd {
    String add();
}

public abstract class Coffee {
    private CoffeeAdd coffeeAdd;
    Coffee(CoffeeAdd coffeeAdd) {
        this.coffeeAdd = coffeeAdd;
    }
    public abstract void show();
    public CoffeeAdd getCoffeeAdd() {
        return coffeeAdd;
    }
    public void setCoffeeAdd(CoffeeAdd coffeeAdd) {
        this.coffeeAdd = coffeeAdd;
    }
}

public class latteCoffee extends Coffee{
    latteCoffee(CoffeeAdd coffeeAdd) {
        super(coffeeAdd);
    }
    @Override
    public void show() {
        System.out.println("拿铁咖啡"+super.getCoffeeAdd().add());
    }
}

public class MCoffee extends Coffee{
    MCoffee(CoffeeAdd coffeeAdd) {
        super(coffeeAdd);
    }
    @Override
    public void show() {
        System.out.println("美式咖啡"+super.getCoffeeAdd().add());
    }
}

public class Client {
    public static void main(String[] args) {
        Milk milk = new Milk();
        Sugar sugar = new Sugar();
        /**
         * 结果为：
         * 美式咖啡加奶
         * 美式咖啡加糖
         * 拿铁咖啡加奶
         * 拿铁咖啡加糖
         */
        new MCoffee(milk).show();
        new MCoffee(sugar).show();
        new latteCoffee(milk).show();
        new latteCoffee(sugar).show();
    }
}