Question

I have a class named “toto” which I send to a function that does the following:

getData(toto);

public String getData(Class myClass) {
 javax.jdo.Query query = p.newQuery(myClass);
  List<myClass> list = (List<myClass>) pm.newQuery(query).execute();
 for (myClass element : list) {
   Do something here
 }
}

The problem is that I get type compilation error.
What am I doing wrong?

Joel

Answer 1

You can’t use a runtime variable as an “argument” to a generics construct (like List<X>). If you know something about the classes you’ll pass in, then you can constrain that:

public String getData(Class<? extends Something> myClass) {
  // ...
  List<Something> list = (List<Something>) // ...