Re: abstract generic class?

From:
"Bart Cremers" <bcremers@gmail.com>
Newsgroups:
comp.lang.java.help
Date:
17 Jul 2006 00:05:12 -0700
Message-ID:
<1153119912.420824.194800@m73g2000cwd.googlegroups.com>
Jeff Higgins schreef:

Hi,

Is it possible to do something
like the following. If so how?

Any help will be appreciated.
Jeff Higgins

When I try to compile
java version 1.5.0.06
I get the errors:

The type Format<Integer> must implement the
inherited abstract method Format.set(Object)

Name clash: The method set(Integer) of type Format<Integer>
has the same erasure as set(T) of type Format<T>
but does not override it

The method set(Integer) of type Format<Integer>
must override a superclass method

public abstract class Format<T>{
  public Format(){}
  private T data;
  public abstract T get();
  public abstract void set(T t);
  public T doubleData(){
    return data;
  }
}

public class Format<Integer> extends Format{

  public Format(){}

  private Integer data;

  public Integer get(){
    return data;
  }

  public void set(Integer data){
    this.data = data;
  }
}


The syntax for the subclass is:

public class IntegerFormat extends Format<Integer> {
....

Now, I'm assuming this is just example code you posted, because the
'Format extends Format' would result in cyclic inheritance.

Regards,

Bart

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