Java clone() method

Question

I read Effective Java by J.Bloch and here was wrote:

If you design a class for inheritance, be aware that if you choose not to provide a well-behave

Answer 1

Of course you can implement B.clone().

The problem which J. Bloch refers to is (IIRC), that without a good A.clone() method, the private fields within A can not be cloned properly in B. Simple example:

public class A {
  private String myText;
  public A (String myText) {
    this.myText = myText;
  }
  public String getExtendedText() {
    return "Hello something " + myText;
  }
}

public class B extends A implements Cloneable {
    private int someValue;
    // getter/setter

    public clone() {
        // how can you now provide a good clone with A.myText being cloned?
    }    
}