MyCloneable<T>

interface MyCloneable<T extends MyCloneable<T>> extends Cloneable {
  T clone();
}

class Base<T extends Base<T>> implements MyCloneable<T> {
  @Override
  public T clone() {
    return (T) this;
  }
}

class A extends Base<A> implements MyCloneable<A> {
  @Override
  public A clone() {
    return this;
  }
}

class B extends A implements MyCloneable<A> {
  @Override
  public A clone() {
    return this;
  }
}

public static void main(final String[] args) {
  final B b = new B();
  final A a = b.clone();
}