####################################做个笔记##################################
一、java8的新特性，利用流的distinct来去重

public static List<String> deleteRepeat(List<String> list) {
     List<String> myList = list.stream().distinct().collect(Collectors.toList());
	 return myList ;
}

二、Set集合的特性去重且保持循序TreeSet、LinkedHashSet

public static void deleteRepeat(List<String> list) {
   	   //方法一
       List<String> listNew = new ArrayList<String>(new TreeSet<String>(list));
       //方法二
       List<String> listNew2 = new ArrayList<String>(new LinkedHashSet<String>(list));
}

三、遍历集合，将元素加入另一个集合中

public static List<String> deleteRepeat(List<String> list) {
	  List<String> listNew = new ArrayList<String>();
	  for (String str : list) {
	       if (!listNew.contains(str)) {
	           listNew.add(str);
	       }
	   }
	  return listNew ;
}