How to sort a field data with tree structure in java

Monster Group and GPt-based tuning:
depth-first traversal algorithm that recursively traverses each node and sorts as needed. Here is an example of a recursive depth-first traversal:

public class TreeNode {
    private String id;
    private List<TreeNode> children;

    public TreeNode(String id) {
        this.id = id;
        this.children = new ArrayList<>();
    }

    public String getId() {
        return id;
    }

    public List<TreeNode> getChildren() {
        return children;
    }

    public void addChild(TreeNode child) {
        children.add(child);
    }

    public void sortChildren() {
        Collections.sort(children, Comparator.comparing(TreeNode::getId));
        for (TreeNode child : children) {
            child.sortChildren();
        }
    }
}

public class TreeSorter {
    public static void sort(TreeNode root) {
        root.sortChildren();
    }
}