[英]How to get all classes used in decorator design pattern?
So I'm implementing decorator design patter in java.所以我在 java 中实现装饰器设计模式。
Overall I have this call which works correctly.总的来说,我有这个正常工作的电话。
CrewMember crewMember = new Captain(new ChiefEngineer(new CrewMemberImpl()));
Now I have a question, how could I call a method as a crewMember
from ChiefEngineer
for example(which is not in the base interface).现在我有一个问题,例如,我如何从
ChiefEngineer
调用一个方法作为一个crewMember
(它不在基本接口中)。
What I would want ideally:理想情况下我想要什么:
crewMember.methodFromChiefEngineerClass();
Maybe there is a way to get all related classed from crewMember?也许有一种方法可以从crewMember 获得所有相关的分类? Using instanceof somehow?
以某种方式使用instanceof? Or am I getting it wrong
还是我弄错了
Create a method in the Captain
class to get the ChiefEngineer
object and use that to call methods inside the ChiefEngineer
class.在
Captain
class 中创建一个方法来获取ChiefEngineer
object 并使用它来调用ChiefEngineer
class 中的方法。
public class Captain {
private final ChiefEngineer engineer;
public Captain(final ChiefEngineer engineer) {
this.engineer = engineer;
}
public ChiefEngineer getChiefEngineer() {
return this.engineer;
}
}
Then do然后做
crewMember.getChiefEngineer().methodFromChiefEngineerClass();
Create a proxy-method in Captain
which calls the corresponding method of the contained ChiefEngineer
object.在
Captain
中创建一个代理方法,调用包含的ChiefEngineer
object 的相应方法。
public class Captain {
private final ChiefEngineer chiefEngineer;
public Captain(final ChiefEngineer chiefEngineer) {
this.chiefEngineer = chiefEngineer;
}
public void methodFromChiefEngineerClass() {
chiefEngineer.methodFromChiefEngineerClass();
}
}
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