How to delete files of a directory but not the folders

Question

I have create some code that deletes all the files in a folder, the issue is while this is great, I want to be able to delete all the files in a directory but leave the fold

Answer 1

I think this will do

public void deleteFiles(File folder) throws IOException {
    List files = folder.listFiles()
    foreach(File file: files){
        if(file.isFile()){
            file.delete();
        }else if(file.isDirecotry()) {
            deleteFiles(file)
        }
    }
}

Then you need to call deleteFiles(new File("D:/Documents/NetBeansProjects/printing~subversion/fileupload/web/resources/pdf/"));