java获得文件夹目录

public  class  GetFileName
{
    public  static  String [] getFileName(String path)
    {
        File file =  new  File(path);
        String [] fileName = file.list();
        return  fileName;
    }
    public  static  void  getAllFileName(String path,ArrayList fileName)
    {
        File file =  new  File(path);
        File [] files = file.listFiles();
        String [] names = file.list();
        if (names !=  null )
        fileName.addAll(Arrays.asList(names));
        for (File a:files)
        {
            if (a.isDirectory())
            {
                getAllFileName(a.getAbsolutePath(),fileName);
            }
        }
    }
    public  static  void  main(String[] args)
    {
        String [] fileName = getFileName( "F:\\xiaoshuo" );
        for (String name:fileName)
        {
            System.out.println(name);
        }
        System.out.println( "--------------------------------" );
        ArrayList listFileName =  new  ArrayList();
        getAllFileName( "F:\\xiaoshuo" ,listFileName);
        for (String name:listFileName)
        {
            System.out.println(name);
        }

    }
}