java遍历树状结构对象，父类和所有子节点，拼装成一个整体List集合

@Data
public class ResponseAreaItem {
 private int id;
        private int key;
        private String area_name;
        private String area_code;
        private int level_id;
        private String description;
        private int p_id;
        private String create_time;
        private String update_time;
        private List<ZeusResponseAreaItem> children;
}
/**
 * 区域数对象遍历
 */
public class AreaTreeTraversal {

    /**
     * 遍历树状结构并返回包含顶级节点及其所有子节点的整体集合。
     *
     * @param root 树的顶级节点
     * @return 包含顶级节点及其所有子节点的整体集合
     */
    public static List<ZeusResponseAreaItem> traverseTree(ResponseAreaItem root) {
        List<ZeusResponseAreaItem> allNodes = new ArrayList<>();
        // 递归遍历树状结构
        traverseNode(root, allNodes);
        return allNodes;
    }

    private static void traverseNode(ResponseAreaItem node, List<ZeusResponseAreaItem> allNodes) {
        if (node != null) {
            allNodes.add(node); // 添加当前节点
            List<ZeusResponseAreaItem> children = node.getChildren();
            if(!CollectionUtils.isEmpty(children)){
                for (ResponseAreaItem child : children) {
                    traverseNode(child, allNodes); // 递归遍历子节点
                }
            }

        }
    }
}