codice:
JFileChooser chooser = new  JFileChooser();
					        int returnVal = chooser.showOpenDialog(null);
					        if(returnVal == JFileChooser.APPROVE_OPTION) {
					        	File f = chooser.getSelectedFile(); 				        	
					        	try{ 	
					        		FileInputStream fi = new FileInputStream(f);
					        		int available = fi.available();
					        		link_nome_base.setText("C://DataSong/" +  available);
					        	}
					        	catch(Exception e){
					        		System.out.println(e);
					        	}
l'ho modificato in questo modo....
ma mi esce un numero intero!!!!!!!