父类和子类重复实现公共接口
今天，我在代码中发现似乎是一个子类实现了父类已经继承的接口。
我可以知道这是否有任何不利的副作用或意图，因为我正在努力将其从儿童班级中删除，因为我相信这可能是一个意外错误，或者也许我错过了一些东西？
在子类中：
public class ProductServiceBean
extends GenericSessionBean
implements javax.ejb.SessionBean
在父类中：
// Compiled from GenericSessionBean.java (version 1.2 : 46.0, super bit)
public abstract class weblogic.ejb.GenericSessionBean
extends weblogic.ejb.GenericEnterpriseBean
implements javax.ejb.SessionBean
请注意，在子类和父类中，这些类都实现了 javax.ejb.SessionBean。
Today i found in my codes what appears to be a child class implementing an interface that the parent class is already inheriting.
May i know if this has any adverse side effects or intentions, as i am working on to remove it from the child class as i believe this could have been an accidental mistake, or perhaps am i missing something?
In the child class:
public class ProductServiceBean
extends GenericSessionBean
implements javax.ejb.SessionBean
In the parent class:
// Compiled from GenericSessionBean.java (version 1.2 : 46.0, super bit)
public abstract class weblogic.ejb.GenericSessionBean
extends weblogic.ejb.GenericEnterpriseBean
implements javax.ejb.SessionBean
Note that in both child and parent, the classes do implement the javax.ejb.SessionBean.
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仅从
ProductServiceBean类中删除implements javax.ejb.SessionBean不会有任何效果，因为该类实现接口的事实是继承自父GenericSessionBean类。将其包含在子类中也没有什么坏处，它只是一个多余的声明。
Removing
implements javax.ejb.SessionBeanfrom only theProductServiceBeanclass will have no effect, since the fact that the class implements the interface is inherited from the parentGenericSessionBeanclass.There is also no harm in including it in the child class, it's just a redundant declaration.
让子级和父级都实现相同的接口没有额外的效果。它相当于让父级仅实现该接口。
Having both the child and the parent implement the same Interface has no additional effect. It is equivalent to having the parent only implement that interface.