Visitor pattern, recursively traverse the tree node

interface TreeVisitor {
    /**
     * 访问函数
     *
     * @param t 访问对象（树节点）
     */
    void visit(ItemVO t);
}

    /**
     * 访问者模式，递归遍历树节点
     *
     * @param t       树节点
     * @param visitor 访问者
     */
    private static void visitTree(ItemVO t, TreeVisitor visitor) {
        visitor.visit(t);
        if (null != t.children) {
            for (ItemVO child : t.children) {
                visitTree(child, visitor);
            }
        }
    }

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