Declaring Argument as Class of Enum That Implements Interface

Question

I'm trying to declare a method parameter that is the class of an enum which implements a specified interface. I can't figure out the required syntax, or if this is even possible.
Here is the interface:
public interface Describer { String describe(); }_________________________________________________
Here' s an enum that implements the interface:
public enum DeviceProperty implements Describer {
TYPE("Device Type"),
USE("Device Use");
private String description;
private DeviceProperty(final String description) { this.description = description; }
@Override public String describe() { return description; }
Here's my unsuccessful attempt to declare the method parameter:
public <E extends Enum<E extends Describer>> void addChanges(final Class<E> properties) {
     final EnumSet<E> set = EnumSet.allOf(properties);
     for (final Enum<E> property : set) {
          // Do something with the property
The problem, of course, is that addChanges() doesn't compile. If I remove "extends Describer" it compiles, but then I can't detect compile time errors (i.e., an enum which doesn't implement Describer).
Is what I'm attempting even possible in Java? If so, I'd be very grateful if someone could explain the correct syntax.

Answer 1

doremifasollatido wrote:
TPD Opitz-Consulting com wrote:
aksarben wrote:
[...]Here's my unsuccessful attempt to declare the method parameter:
public <E extends Enum<E extends Describer>> void addChanges(final Class<E> properties)
Nothing is being returned at all. The method return type is "void".OK.
Then I understand that <tt>&lt;E extends Enum&lt;E extends&gt; &amp; Describer&gt;</tt> is a more detailed definition for the parameter type <tt>Class&lt;E&gt;</tt>, right?
And your method iterates over all the constants defined in the passes enum type.
Meight be usefull sometiems.. thanks!
bye
TPD