Generic OR instead of AND

Question

Is it possible to generically parameterize a method accepting EITHER ClassA OR InterfaceB ?

Does Not Compile Due to | Pseudocode

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Answer 1

Is using an anonymous abstract class an option for you? When I need type safe parameters or return types, I use some variant of the code below. That being said, I agree with the other comments here, and am curious what benefit you really derive when you're enforcing a type safety for a group of objects that don't have all that much in common.

public abstract class Doer {

  public void do(T obj) {
    // do some stuff. 
  }

}

// calling method

new Doer(){}.do(new Integer(5));