getting file extension and allocating it to a new folder using java -

i want make program scan files in 1 directory extension , move new folder in same directory base on extension using java.

ex: folder main have file :

• 1.txt
• 2.mp3
• 3.mkv
• 4.jpeg

this program make folder become :

folder main :

• doc\1.txt
• music\2.mp3
• video\3.mkv
• image\4.jpeg

edit

i want user input name of folders spesific extension can move folder.

ex: files ".docx, .pdf, .txt" move folder "document"

this source code

public static void main(string[] args) {     new file("d://new data/text").mkdirs();     new getallfilesindirectorybasedonextensions().copy("txt", "d://new data//", "d://new data/text"); }  private filetypeorfolderfilter filter = null;  private void copy(final string filetype, string frompath, string outputpath) {     filter = new filetypeorfolderfilter(filetype);     file currentfolder = new file(frompath);     file outputfolder = new file(outputpath);     scanfolder(filetype, currentfolder, outputfolder); }  private void scanfolder(final string filetype, file currentfolder, file outputfolder) {     system.out.println("scanning folder [" + currentfolder + "]...");     file[] files = currentfolder.listfiles(filter);     (file file : files) {         if (file.isfile()) {             copy(file, outputfolder);             file.delete();          }     } }  private void copy(file file, file outputfolder) {     try {         system.out.println("\tcopying [" + file + "] folder [" + outputfolder + "]...");         inputstream input = new fileinputstream(file);         outputstream out = new fileoutputstream(new file(outputfolder + file.separator + file.getname()));         byte data[] = new byte[input.available()];         input.read(data);         out.write(data);         out.flush();         out.close();         input.close();     } catch (exception e) {         throw new runtimeexception(e);     } }  private final class filetypeorfolderfilter implements filefilter {     private final string filetype;      private filetypeorfolderfilter(string filetype)     {         this.filetype = filetype;     }      public boolean accept(file pathname)     {         return pathname.getname().endswith("." + filetype) || pathname.isdirectory();     } }