How to check if the folder exists in subfolder of same level in java?

I have folder structure as below and I need to check and copy files from AB1 folder to CD1 folder.

Root Folder
|___AB ------------------------>DD
    |__AB1 and AB2(folders)      |_AB1 and AB2
        |_CD1                       |__CD1 |__CD2

But it is checking for CD1 in both AB1 and AB2 folders and
files are not generating.

File file = new File("workspace");
List<File> abFolders = getDir(file); //level 1 folders
abFolders = new ArrayList<File>(abFolders);
List<File> cdFolders = getSubdirs(abFolders); //level 2 folders

//print
for (File file1 : abFolders) {
    for(File file2:cdFolders){
     //Here I need to check if CD folder is present in AB1 then it has to copy to CD1 and not to check for another CD1 folder in AB2 folder.
         System.out.println(file1.getName());
         System.out.println(file2.getName());
    }
    
}

private static List<File> getDir(File file) {
    List<File> subdirs = Arrays.asList(file.listFiles(new FileFilter() {
        public boolean accept(File f) {
            return f.isDirectory();
        }
    }));
    return subdirs;
}
static List<File> getSubdirs(List<File> subdirs) {
    List<File> deepSubdirs = new ArrayList<File>();
    for(File subdir : subdirs) {
        deepSubdirs.addAll(getDir(subdir)); 
    }
    //subdirs.addAll(deepSubdirs);
    return deepSubdirs;
}

Use collections, so that you sort abFolders and cdFolders. First import the library:

import java.util.Collections;

Then do the sort of AB folders, before entering loop.

Collections.sort(abFolders);
for (File file1 : abFolders) {
    for(File file2:cdFolders){
     //Here I need to check if CD folder is present in AB1 then it has to copy to CD1 and not to check for another CD1 folder in AB2 folder.
         System.out.println(file1.getName());
         System.out.println(file2.getName());
    }
    
}