静态工厂方法与实例工厂方法

三、静态工厂方法

public class AnimalFactory {

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

}

然后cat和dog

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

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

Helloservice里面

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();
    }
}

    
        
            
             //静态方法这里是重点要配置的
        

    
        
    

    
        
    

测试：

    /**
     * 静态构造方法测试
     */
    @Test
    public void testsaticbean(){
        System.out.println("haha"+helloService.getAnimal());
        System.out.println(helloService.statitest());

    }

 

四、实例工厂方法：

去掉static

public class AnimalFactory {

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

}