list筛选出包含特定字符串的元素，元素再反转，再去重（使用jdk8 stream）

去重可以用set，这里使用jdk8 stream去重。

例如：

 1     public static void main(String[] args) {
 2         String subStr = "a";
 3         List<String> list = new ArrayList<>(Arrays.asList("abc", "test", "ivy", "absent", "total", "jack", "woo", "java", "Jenkins", "docker","test","Docker"));
 4         List<String> tempList = new ArrayList<>();
 5         //筛选包含a的元素
 6         for (String s :list) {
 7             if (!s.contains(subStr)) {
 8                 //元素反转
 9                 String reverse = new StringBuffer(s).reverse().toString();
10                 tempList.add(reverse);
11             }
12         }
13 
14         //去重
15         List<String> result = tempList.stream().distinct().collect(Collectors.toList());
16         System.out.println(result.get(0));
17         System.out.println(result.get(1));
18         System.out.println(result.get(2));
19 
20     }