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Groups > comp.lang.java.programmer > #8558

generic constructor call with concret type

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Hello,
I have th following proble:

abstract baseclass<T extends Number> {

	abstract T dosomething();
}

class runclass<T extends Number> implements baseclass<T>{}

Now I would only implementate the runclass<T> for the datatype Double 
and Float on other Number-types the compiler
should create an error.

At next I use a inner interface and class like

class runclass<T extends Number> implements baseclass<T>{

    private interface innerintface<L extends Number>
    {
          public L doanother();
    }

    // and implement the interface with inner classes
    private class floatrun implements innerintface<Float>
    {
    }

    private class doublerun implements innerintface<Double>
    {
    }



   // use a private member to store the object
   private innerintface<T> obj = null

   public runclass() {
       // here is my problem to decide if I need create the obj = new 
floatrun() or obj = new doublerun();
  }

}

My runclass<T> should be only work with Double or Float datatypes at 
the moment. In C++ template
I would create the conrect implement types and a genereal type that 
creates an assert. Can I do anything
like
class runclass<T only Double>?

Thanks

Phil

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generic constructor call with concret type Philipp Kraus <philipp.kraus@flashpixx.de> - 2011-10-05 09:48 +0200
  Re: generic constructor call with concret type Robert Klemme <shortcutter@googlemail.com> - 2011-10-05 02:22 -0700
    Re: generic constructor call with concret type Philipp Kraus <philipp.kraus@flashpixx.de> - 2011-10-05 11:58 +0200
      Re: generic constructor call with concret type Robert Klemme <shortcutter@googlemail.com> - 2011-10-05 22:14 +0200

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