设计模式 工厂方法模式（笔记）

优点:实现了开闭原则,多出一个种类的coffee,直接多出一个子类实现interface FactoryCoffee，不需要做出更改
缺点:种类过多，就会很繁琐
public abstract class Coffee{
    public abstract String getName();

}

public class AmericanCoffee extends Coffee {
    @Override
    public String getName() {
        return "让美国再次伟大";
    }
}

public class ChinaCoffee extends Coffee {

    @Override
    public String getName() {
        return "中国coffee";
    }
}

public interface FactoryCoffee {
    Coffee createCoffee();
}

public class FactoryCoffeeAmerican implements FactoryCoffee {
    @Override
    public Coffee createCoffee() {
        return new AmericanCoffee();
    }
}

public class FactoryCoffeeChina implements FactoryCoffee {
    @Override
    public Coffee createCoffee() {
        return new ChinaCoffee();
    }
}

public class CoffeeStore {
    private FactoryCoffee factoryCoffee;

    public FactoryCoffee getFactoryCoffee() {
        return factoryCoffee;
    }

    public void setFactoryCoffee(FactoryCoffee factoryCoffee) {
        this.factoryCoffee = factoryCoffee;
    }

    public Coffee createCoffee(){
        Coffee coffee = factoryCoffee.createCoffee();
        return coffee;
    }
}

public class Client{
    public static void main(String[] args) {
        //创建store对象
        CoffeeStore coffeeStore = new CoffeeStore();
        //创建具体工厂对象
        FactoryCoffeeAmerican factory = new FactoryCoffeeAmerican();
        //传入工厂对象
        coffeeStore.setFactoryCoffee(factory);
        //获得coffee对象
        Coffee coffee = coffeeStore.createCoffee();
        //打印coffee名字
        System.out.println(coffee.getName());
    }
}