Re: Java Generics - "super" keyword usage

Ah never mind. Too early in the morning I guess. Here is what I wanted to ask. Sorry for the confusion:

public <T extends IColumn> ICompactSerializer<T> serializer()
 {
 // this complains saying cannot convert from MyColumnSerializer to ICompactSerializer<T>
 return new MyColumnSerializer();
 }
 
 class MyColumnSerializer implements ICompactSerializer<MyColumn>
 {
 public void serialize(MyColumn column, DataOutputStream dos) throws IOException
 {
 }
 
 public MyColumn deserialize(DataInputStream dis) throws IOException
 {
 return null;
 }
 }
 
 Now this method is defined in an interface
called IColumn. I want any class that implements this serializer()
method to pass its type to the ICompactSerializer template argument. Is
this doable and if so what am I doing wrong?



> Date: Thu, 20 Sep 2007 10:14:45 -0500
> From: [email protected]
> Subject: [ADVANCED-JAVA] Java Generics - "super" keyword usage
> To: [email protected]
> 
> Hi All 
> 
> This has been driving me insane. I am pretty sure it is very simple and hopefully someone can clear this up for me. What is wrong with the following:
> 
> public <T super IColumn> ICompactSerializer<T> serializer()
>     {
>         return new MyColumnSerializer();
>     }
> 
> class MyColumnSerializer implements ICompactSerializer<MyColumn>
> {
>     public void serialize(MyColumn column, DataOutputStream dos) throws IOException
>     {
>     }
> 
>     public MyColumn deserialize(DataInputStream dis) throws IOException
>     {
>         return null;
>     }
> }
> 
> It complains about the "super" keyword. However the same compiles with the "extends" keyword. Now this method is defined in an interface called IColumn. I want any class that implements this serializer() method to pass its type to the ICompactSerializer template argument. Is this doable and if so what am I doing wrong?
> 
> Thanks
> Avinash
> 
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