//创建一个测试方法 Set<String> set:他们可以是实现了该接口的LinkedListSet和BSTSet对象
 private static double testSet(Set<String> set, String filename) {
  //计算开始时间
  long startTime = System.nanoTime();
  System.out.println("Pride and Prejudice");
  //新建一个ArrayList存放单词
  ArrayList<String> words1 = new ArrayList<>();
  //通过这个方法将书中所以单词存入word1中
  FileOperation.readFile(filename, words1);
  System.out.println("Total words : " + words1.size());

  //增强for循环，定一个字符串word去遍历words
  //底层的话会把ArrayList words1中的值一个一个的赋值给word
  for (String word : words1)
   set.add(word);//不添加重复元素
  System.out.println("Total different words : " + set.getSize());

  //计算结束时间
  long endTime = System.nanoTime();
  return (endTime - startTime) / 1000000000.0;//纳秒为单位
 }

 public static void main(String[] args) {
  //基于二分搜索的集合
  BSTSet<String> bstSet = new BSTSet<>();
  double time1 = testSet(bstSet, "pride-and-prejudice.txt");
  System.out.println("BSTSet:" + time1 + "s");
  System.out.println("————————————————————");
  //基于链表实现的集合
  LinkedListSet<String> linkedListSet = new LinkedListSet<>();
  double time2 = testSet(linkedListSet, "pride-and-prejudice.txt");
  System.out.println("linkedListSet:" + time2 + "s");

 }