Mix-in style multiple inheritance

OrangeElephant.java

public interface Elephant {
  public int go();
  public int poop();
}

public interface Orange {
  public int pop();
  public int ripe();
}

public class ElephantImpl implements Elephant {
  @Override
  public int go() {
    return 1;
  }

  @Override
  public int poop() {
    return 2;
  }
}

public class OrangeImpl implements Orange {
  @Override
  public int ripe() {
    return 3;
  }

  @Override
  public int pop() {
    return 4;
  }
}

public class ElephantOrange implements Elephant, Orange {
  private final Elephant internalElephant;
  private final Orange internalOrange;

  public ElephantOrange() {
    internalElephant = new ElephantImpl();
    internalOrange = new OrangeImpl();
  }

  @Override
  public int go() {
    return internalElephant.go();
  }

  @Override
  public int poop() {
    return internalElephant.poop();
  }

  @Override
  public int pop() {
    return internalOrange.pop();
  }

  @Override
  public int ripe() {
    return internalOrange.ripe();
  }
}