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Re: Instantiate an abstract class

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On 04/06/2011 12:26 PM, Lothar Kimmeringer wrote:
> Rob McDonald wrote:
>> When I try it, I get a variety of errors depending on different
>> attempts...
>>
>> AFoo a = new this.getClass();

A very brief study of the Java tutorials will reveal that this is not valid 
syntax.

>> Syntax error on token "this", invalid Name
>>
>> AFoo a = new (this.getClass());

Likewise.

>> AFoo a = new (this).getClass();

And again.

>> Syntax error on token "new", ClassType expected after this token

As explained in the tutorials:
<http://download.oracle.com/javase/tutorial/index.html>

> getClass().newInstance();

You left out the object on which to call 'getClass()'.  How do you get an 
instance on which to call the method?

What if the constructor is not parameterless?

Rob, post a complete class source - not just one-liners.  Make a compilable 
example.  It's ok to be compilable with errors for this purpose - we want to 
analyze the errors.  But we cannot reproduce your work or put our answers in 
context without what's called an "SSCCE"
http://sscce.org/

Remember, "compilable" doesn't necessarily have to be "correct" as in "no 
errors".  If the purpose is to discuss the errors, we want an example that has 
those errors so that we can discuss how to repair them.

But do read the tutorials first.

-- 
Lew
Honi soit qui mal y pense.
http://upload.wikimedia.org/wikipedia/commons/c/cf/Friz.jpg

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Instantiate an abstract class Rob McDonald <rob.a.mcdonald@gmail.com> - 2011-04-05 14:14 -0700
  Re: Instantiate an abstract class Patricia Shanahan <pats@acm.org> - 2011-04-05 14:37 -0700
    Re: Instantiate an abstract class Rob McDonald <rob.a.mcdonald@gmail.com> - 2011-04-05 14:49 -0700
  Re: Instantiate an abstract class Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-04-05 17:48 -0400
    Re: Instantiate an abstract class Rob McDonald <rob.a.mcdonald@gmail.com> - 2011-04-05 14:54 -0700
      Re: Instantiate an abstract class Patricia Shanahan <pats@acm.org> - 2011-04-05 15:09 -0700
      Re: Instantiate an abstract class Lew <noone@lewscanon.com> - 2011-04-06 12:43 -0400
        Re: Instantiate an abstract class "John B. Matthews" <nospam@nospam.invalid> - 2011-04-06 22:07 -0400
  Re: Instantiate an abstract class Roedy Green <see_website@mindprod.com.invalid> - 2011-04-05 19:02 -0700
  Re: Instantiate an abstract class Roedy Green <see_website@mindprod.com.invalid> - 2011-04-05 19:42 -0700
  Re: Instantiate an abstract class Lothar Kimmeringer <news200709@kimmeringer.de> - 2011-04-06 18:26 +0200
    Re: Instantiate an abstract class Lew <noone@lewscanon.com> - 2011-04-06 12:49 -0400
      Re: Instantiate an abstract class Patricia Shanahan <pats@acm.org> - 2011-04-06 10:09 -0700
      Re: Instantiate an abstract class Lothar Kimmeringer <news200709@kimmeringer.de> - 2011-04-07 01:01 +0200
  Re: Instantiate an abstract class Wojtek <nowhere@a.com> - 2011-04-06 12:41 -0700

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