enum枚舉實現策略模式

// 策略模式是為了簡化if else判斷
String type = "dog";
if(type.eques("dog")){
    System.out.print("汪汪汪");
}else if(type.eques("cat")){
    System.out.print("M喵喵喵");
}

 

if else顯得代碼很不簡介

下面使用策略模式處理:

public interface Animal {

    void bark();
}
----
public class Cat implements Animal {
    @Override
    public void bark() {
        System.out.println("喵喵喵");
    }
}
---
public class Dog implements Animal, ApplicationContextAware {
    private ApplicationContext applicationContext;
    @Override
    public void bark() {
        System.out.println("汪汪汪");
        Object nanhxgoodMapper = applicationContext.getBean("nanhxgoodMapper");
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

}
---
public enum  StrageEnum {
    DOG(new Dog()),
    CAT(new Cat());

    private Animal animal;

    StrageEnum(Animal animal) {

        this.animal = animal;
    }

    public Animal getAnimal() {
        return animal;
    }


}

----
public static void main(String[] args) {
        StrageEnum.valueOf("CAT").getAnimal().bark();
    }