public static void main(String args\[\]) throws IOException{  
  List<String\> lines \= Files.readAllLines(Paths.get("test.txt"));  
  Random r \= new Random();  
  while(!lines.isEmpty()){       
   String nextLine \= lines.get(r.nextInt(lines.size()));  
   System.out.println(nextLine);  
   lines.remove(nextLine);     
  }    
 }