With concrete or abstract classes, inner classes are the only way to produce the effect

  

// : c08:MultiImplementation.java
// With concrete or abstract classes, inner classes are the only way to produce the effect
// of "multiple implementation inheritance."
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

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());
  }
} ///:~

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With concrete or abstract classes, inner classes are the only way to produce the effect : Inner Class « Class « Java

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