Trier un fichier

public class MaskType {

     static int mask_count=0;
    
    public MaskType(File f) throws FileNotFoundException, IOException {

        Map< String,Integer> mp=new HashMap <String, Integer>();
        
        InputStream ips=new FileInputStream(f); 
	InputStreamReader ipsr=new InputStreamReader(ips);
	BufferedReader br=new BufferedReader(ipsr);
        String ligne="";
        
   while ((ligne=br.readLine())!=null)     
    { 
    // adding or set elements in Map by put method key and value pair
       
        if (mp.containsKey(ligne))
        { 
            mask_count=mp.get(ligne);
            mask_count=mask_count+1;
            mp.put(ligne, mask_count);
        }
        else
        { 
            mp.put(ligne, 1);  
        }
    }
       
   //Get Map in Set interface to get key and value
        Set s=mp.entrySet();

   //Move next key and value of Map by iterator
        Iterator it=s.iterator();

        while(it.hasNext())
        {
            // key=value separator this by Map.Entry to get key and value
            Map.Entry m =(Map.Entry)it.next();

            // getKey is used to get key of Map
            String key=(String)m.getKey();

            // getValue is used to get value of key in Map
            int value = (int)m.getValue();
           
            FileWriter fw = new FileWriter ("/root/Desktop/"+key);
	    BufferedWriter bw = new BufferedWriter (fw); 
            PrintWriter pr=new PrintWriter(bw);
            pr.println(value);
            pr.flush();
            System.out.println("Key :"+key+"  Value :"+value);
        }
    
    }
    public static void main(String[] args) throws FileNotFoundException, IOException {
        MaskType m=new MaskType(new File("/root/Desktop/test"));
    }
}