We don't have the reflection APIs implemented in the prototpe because that requires VM support, which is a much larger thing that what's included in the 2.0 prototype We will ship a prototype that includes the new VM (and javadoc, and everything else), but unfortunately it won't be for a while. I'm guessing November. We'll be calling it "J2SE 1.5 Beta 1".

 

 

Hey, mlorton! I guess you want to do something similar to what I want. Look at this code:

class Foo {
    static Map <String, Integer> bar() {
        return null;
    }
 
    public static void main(String[] args) throws Exception {
        Method m = Foo.class.getDeclaredMethod("bar");
        
        ParameterizedType ptype = (ParameterizedType) m.getGenericReturnType();
        for (Type targ: ptype.getActualTypeArguments()) {
            Class tcls = (Class) targ;
            System.out.println(tcls.getName());
        }
    }
}

This snippet will work on any 1.5 JVM and will print: String Integer. I got this information from an IBM site: http://www-128.ibm.com/developerworks/java/library/j-cwt11085.html

It works also if you have an "bar" field instead of a method, but, I couldn't get information about the content of the field (i.e. the instance stored in the field).

Best regards,
Eduardo

 

 

Hello,

there is yet another workarround:

public class MyGenericClass<T> {
 
  public void getTypeClassName() {
    String genericSuperclass = findGenericSuperclass(getClass()).getGenericSuperclass().toString();
    return genericSuperclass.substring(MyGenericClass.class.getName().length() + 1, genericSuperclass.length() - 1));
  }
  
  private Class findGenericSuperclass(Class clazz) {
    if (clazz.getGenericSuperclass().toString().startsWith(MyGenericClass.class.getName())) {
      return clazz;
    } else {
      return findGenericSuperclass(clazz.getSuperclass());
    }
  }
  
  public static void main(String[] args) throws Exception {
   MyGenericClass test = new Test();
    System.out.println(test.getTypeClassName());
  }
}
 
class Test extends MyGenericClass<Integer> {
}

Regards,

Tomas Klima
www.aiteq.cz