[4983] in java-interest
Re: Creating new objects given a class name
daemon@ATHENA.MIT.EDU (Arthur van Hoff)
Thu Jan 25 01:02:18 1996
Date: Wed, 24 Jan 1996 20:07:51 -0800
From: Arthur.Vanhoff@Eng.Sun.COM (Arthur van Hoff)
To: gregg@fruitfly.berkeley.edu
Cc: java-interest@java.Eng.Sun.COM
Hi Gregg,
> I'm trying to take a String with the name of a class, and instantiate
> objects of that class. I've been trying to do this with Class methods:
>
> Class class_type;
> class_type = Class.forName("class_name");
> ...
> Object obj;
> obj = class_type.newInstance();
>
> This compiles OK, but running it gives a "java.lang.NoSuchMethodError" on
> that last line. And even if it did run, I'm not sure what to do with the
> resulting object -- how do I call a constructor for obj?
>
> Is there another way to do this? Am I not _supposed_ to be able to do this?
Yes. But the class that you are trying to instanciate probably does not
have a public default constructor. If you add that then it will work.
Have fun,
Arthur van Hoff
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