[jboss-dev-forums] [Design of POJO Server] - Re: Annotation to metadata status

[wolfc]

Just try the following:
Collection<Class<? extends Collection>> c1 = new ArrayList<Class<? extends Collection>>();
  | c1.add(ArrayList.class);
  | c1.add(Collection.class);
  | c1.add(String.class);
add(java.lang.Class<? extends java.util.Collection>) in java.util.Collection<java.lang.Class<? extends java.util.Collection>> cannot be applied to (java.lang.Class<java.lang.String>)
  |                 c1.add(String.class);
  |                   ^
  | 1 error
As expected.

And then:
Collection<Class<?>> c1 = new ArrayList<Class<?>>();
  | c1.add(ArrayList.class);
  | c1.add(Collection.class);
  | c1.add(String.class);
The collection of classes of many types.

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