[设计模式Java实现附plantuml源码~创建型] 集中式工厂的实现～简单工厂模式

@startuml


class Factory {
  + {static} factoryMethod(): Product
}
abstract class Product {
  + {abstract} operation(): void
}
class ConcreteProductA extends Product {
  + operation(): void
}
class ConcreteProductB extends Product {
  + operation(): void
}

Factory -up-> ConcreteProductA : creates >
Factory -up-> ConcreteProductB : creates >
@enduml

package create;


// 抽象产品角色
abstract class Product {
    abstract void  operation();
}

// 具体产品角色A
class ConcreteProductA extends Product {
    @Override
    public void operation() {
        System.out.println("ConcreteProductA operation");
    }
}

// 具体产品角色B
class ConcreteProductB extends Product {
    @Override
    public void operation() {
        System.out.println("ConcreteProductB operation");
    }
}

// 工厂类
class Factory {
    public static Product factoryMethod(String productType) {
        Product product = null;
        if (productType.equals("A")) {
            product = new ConcreteProductA();
        } else if (productType.equals("B")) {
            product = new ConcreteProductB();
        }
        return product;
    }
}

// 客户端代码

public class SimpleFactory {
    public static void main(String[] args) {
        // 创建具体产品A
        Product productA = Factory.factoryMethod("A");
        productA.operation();

        // 创建具体产品B
        Product productB = Factory.factoryMethod("B");
        productB.operation();
    }
}