DriveItemCollectionPage driveItems = graphClient.drives(siteId).items(driveItemId).children().buildRequest()
                .get();
        String fileId = "";
        
            for (DriveItem driveItem : driveItems.getCurrentPage()) {
            
            if (driveItem.folder != null && driveItem.name.equalsIgnoreCase(folderName.get(index))) {
                fileId = driveItem.id;
                break; 
            } else if (driveItem.file != null
                    && driveItem.name.equalsIgnoreCase(folderName.get(folderName.size() - 1))) {
                fileId = driveItem.id;
            }
         }
<dependency>
    <groupId>com.microsoft.graph</groupId>
    <artifactId>microsoft-graph</artifactId>
    <version>5.74.0</version>
 </dependency>

I have more so many files and it contains few subfolders also. I want to fetch only the folders so i don’t need to iterate over files. Is there any way to sort or orderby or filter just folders ‘Document Library’ from sharepoint using graphclient in java sdk.
I am iterating over driveItems.getNextPage() also with same code. There are around 15lakh files.