Class cast exception

[Jefhandle]

Hi
I have two Java Projects ProjectA, ProjectB
ProjectA has a refrence to ProjectB and can call the Java classes from ProjectB.
Now , I hava created in A, a Dupplicate of a Java class which exists in B and try to
Cast the originally Object(exist in B) as follow but I get a class cast exception:
com.projectA.MyDupplicateA myAObject = (MyDupplicateA)
com.projectB.getBObjects()[0];
??
Thanks for your help

 

[Diancecht]

You have to choose wether to use the package name or not, but is has to be consistent

com.projectA.MyDupplicateA myAObject = (com.projectA.MyDupplicateA) com.projectB.getBObjects()[0];

or

import com.projectA.MyDupplicateA;

MyDupplicateA myAObject = (MyDupplicateA) com.projectB.getBObjects()[0];

Cheers,
Dian

 

[Jefhandle]

Thanks, but doe not work! ??
here are my class hirarchy:
MyDupplicateA extends probjectB.Objectx implments projectB.xxInterface
projectB.MyObjectB extends probjectB.Objectx implments projectB.xxInterface

Anay Idea??

 

[Diancecht]

What does com.projectB.getBObjects() return?

Cheers,
Dian

 

[stefanwagner]

That's not how casting works, see JLS:

http://java.sun.com/docs/books/jls/third_edition/html/conversions.html

.

You can write a convert method on your own, taking an a.X and producing a b.X out of it, and call that converison method.



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