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  public void deepCopy(int[] ints, HttpCookie[] cookies) {
    if (ints == null || cookies == null) {
      throw new NullPointerException();
    }

    // Shallow copy
    int[] intsCopy = ints.clone();

    // Deep copy
    HttpCookie[] cookiesCopy = new HttpCookie[cookies.length];
    for (int i = 0; i &lt;< cookies.length; i++) {
      // Manually create copy of each element in array
      cookiesCopy[i] = (HttpCookie)cookies[i].clone();
    }
 
    doLogic(intsCopy, cookiesCopy);
}

// java.util.Collection is an interface
public void copyInterfaceInput(Collection&lt;String&gt;Collection<String> collection) {
  doLogic(collection);
}

public void copyInterfaceInput(Collection&lt;String&gt;Collection<String> collection) {
  // Convert input to trusted implementation
  collection = new ArrayList(collection);
  doLogic(collection);
}