JAVA代码实现多级树结构封装对象

-- ----------------------------
-- Table structure for dept
-- ----------------------------
DROP TABLE IF EXISTS `dept`;
CREATE TABLE `dept` (
  `id` varchar(36) NOT NULL,
  `name` varchar(255) DEFAULT NULL,
  `parent_id` varchar(36) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

public class Dept implements Serializable {
    private static final long serialVersionUID = -2809004220612317111L;
    //ID
    private String id;
    //部门名称
    private String name;
    //父ID
    private String parentId;
    
     //get/set方法省略
}