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Random rnd = new Random();

// Zufallszahl zwischen 1 und 100
int rndNmbr = rnd.nextInt(100) + 1;

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BufferedReader einlesen = new BufferedReader(new FileReader("Zufallszahlen.txt"));

LinkedList<Integer> linkedList = new LinkedList<Integer>();

while ((s = einlesen.readLine()) != null){

   try {
      int val = Integer.parseInt(s);
   } catch (NumberFormatException e) {
      System.out.println("Fehler: " + e);
      return;
   }

   linkedList.put(new Integer(val));
}

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BufferedReader einlesen = new BufferedReader(new FileReader("Zufallszahlen.txt"));

int sum = 0;
int count = 0;

while ((s = einlesen.readLine()) != null){
   sum += Integer.parseInt(s);
   count++;
}

System.out.println("Durchschnitt: " + ((double)sum /count ) )