靜態工廠方法與實例工廠方法

三、靜態工廠方法

public class AnimalFactory {

    public static Animal getAnimal(String type) {
        if ("dog".equals(type)) {
            return new Dog();
        } else {
            return new Cat();
        }
    }

}

然後cat和dog

public class Cat extends Animal {
    @Override
    String getName() {
        return "cat";
    }
}

public class Dog extends Animal {
    @Override
    String getName() {
        return "dog";
    }
}

Helloservice裏面

public class HelloService {
    private Student student;

    private Animal animal;

    public Animal getAnimal() {
        return animal;
    }

    public void setAnimal(Animal animal) {
        this.animal = animal;
    }

    public Student getStudent() {
        return student;
    }

    public void setStudent(Student student) {
        this.student = student;
    }
    public String hello() {
        return student.toString();
    }
    public String statitest() {
        return animal.getName();
    }
}

    </bean>
        <bean id="helloService" class="com.tx.ioc.xml.HelloService">
            <property name="student" ref="student"/>
            <property name="animal" ref="dog"/> //靜態方法這裏是重點要配置的
        </bean>

    <bean id="dog" class="com.tx.ioc.xml.AnimalFactory" factory-method="getAnimal">
        <constructor-arg value="dog"/>
    </bean>

    <bean id="cat" class="com.tx.ioc.xml.AnimalFactory" factory-method="getAnimal">
        <constructor-arg value="cat"/>
    </bean>

測試：

    /**
     * 靜態構造方法測試
     */
    @Test
    public void testsaticbean(){
        System.out.println("haha"+helloService.getAnimal());
        System.out.println(helloService.statitest());

    }

 

四、實例工廠方法：

去掉static

public class AnimalFactory {

    public  Animal getAnimal(String type) {
        if ("dog".equals(type)) {
            return new Dog();
        } else {
            return new Cat();
        }
    }

}

 

<bean name="animalFactory" class="com.tx.ioc.xml.AnimalFactory"></bean>
    <bean id="cat" factory-bean="animalFactory" factory-method="getAnimal">
    <constructor-arg value="cat"/>
    </bean>
     <bean id="dog" factory-bean="animalFactory" factory-method="getAnimal">
        <constructor-arg value="dog"/>
    </bean>