我目前有幾個(gè)實(shí)體作為樹(shù)，需要將它們保存到數(shù)據(jù)庫(kù)。因此，為了不重復(fù)代碼，我構(gòu)建了此類(lèi)：@MappedSuperclasspublic abstract class TreeStructure<T extends TreeStructure>{    @ManyToOne(cascade = CascadeType.PERSIST)    private T  parent;    @OneToMany(mappedBy = "parent", fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)    protected Set<T> children = new HashSet<>();    /**     * Function that is used before deleting this entity. It joins this.children to this.parent and viceversa.     */    @Transactional    @PreRemove    public void preDelete()    {        unregisterInParentsChildren();        while (!children.isEmpty())        {            children.iterator().next().setParent(parent);        }    }    public abstract long getId();    protected void setParent(T pParent)    {        unregisterInParentsChildren();        parent = pParent;        registerInParentsChildren();    }    /**     * Register this TreeStructure in the child list of its parent if it's not null.     */    private void registerInParentsChildren()    {        getParent().ifPresent((pParent) -> pParent.children.add(this));    }    /**     * Unregister this TreeStructure in the child list of its parent if it's not null.     */    private void unregisterInParentsChildren()    {        getParent().ifPresent((pParent) -> pParent.children.remove(this));    }    /**     * Move this TreeStructure to an new parent TreeStructure.     *     * @param pNewParent the new parent     */    public void move(final T pNewParent)    {        if (pNewParent == null)        {            throw new IllegalArgumentException("New Parent required");        }        if (!isProperMoveTarget(pNewParent) /* detect circles... */)        {            throw new IllegalArgumentException(String.format("Unable to move Object %1$s to new Object Parent %2$s", getId(), pNewParent.getId()));        }        setParent(pNewParent);    }  所以，最后要說(shuō)的是：有沒(méi)有以更好/更干凈的方式實(shí)現(xiàn)這一點(diǎn)？這個(gè)警告有意義，還是只是Intellij不夠聰明？