Way to specify multiple interfaces in Java

Question

I have two interfaces, HasClickHandlers and DoesFancyFeedback. Then I have some UI objects that implement both interfaces - for example, a B

Answer 1

You may try to use generics:

public < T extends HashClickHandlers & DoesFancyFeedback > void foo (
        T aThingIPassedIn
    )
{
    aThingIPassedIn.addClickHandler( );
    aThingIPassedIn.doFancyFeedback( );
}