A way to implement partial classes in java

Question

I have an interface that I want to implement in separate classes after doing a quick google search apparently, Java doesn't have partial classes. Is there a way that I can do this or am I stuck throwing all of my code into one class?

Basically, I am trying to write a service. Some of the service methods really belong in their own class and seem kind of illogical in the same class. Here is an example of what I am trying to do.

package com.upmc.esdm.messaging.epcd.service; import java.util.List;  import javax.ejb.Remote;  import com.upmc.esdm.messaging.epcd13jpa.entities.EmailDomainTrust;   @Remote public interface MessagingInterfaceRemote { public List<EmailDomainTrust> getEmailDomains();      public int upDateQualityTable();      public string isLogial();      public byte[] ToWritePartialClassesInJava(); } 

I would normally have partial classes in C# and I would put similar methods that return similar values into one partial class (or maybe classes that update a record in one class). How would I implement this? Or should I just put all the method implementations into one class?

Thanks.

Answer 1

There is nothing like partial classes in Java. You can achieve many of the same benefits using aggregation, delegation, and abstract base classes.

_{(I have caved to peer pressure and eliminated the “thankfully” remark that has generated so much heat in the comments. Evidently that little aside seems to have earned me four downvotes, despite being irrelevant to the answer.)}

Answer 2

Aspectj can be the answer to C#/.net partial class feature! Spring Roo is one of the typical development framework using aspectj to divide a class functionalities into several different files.