OnJava8-Examples/innerclasses/MultiImplementation.java

// innerclasses/MultiImplementation.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
// With concrete or abstract classes, inner
// classes are the only way to produce the effect
// of "multiple implementation inheritance."
package innerclasses;

class D {}
abstract class E {}

class Z extends D {
  E makeE() { return new E() {}; }
}

public class MultiImplementation {
  static void takesD(D d) {}
  static void takesE(E e) {}
  public static void main(String[] args) {
    Z z = new Z();
    takesD(z);
    takesE(z.makeE());
  }
}