如何比较List of Long并返回匹配数

Question

我有2 List<Long> id = [2316, 2317, 2318]和

List<Long> existingId = [1004, 1762, 1892, 1342, 1942, 2316]

我想在java中以编程方式知道有多少不匹配以及数字是多少，在本例中为2和2317,2318

以编程方式，我尝试了以下内容，但它始终以false为无限循环：

for(int i=0; i<webCrtIdListExisting.size(); i++){
    System.out.println("#########" + webCrtIdListExisting.contains(webCrtIdListNightly));
}

Answer 1

您可以尝试这样的事情：

     Collection<Integer> id = Arrays.asList(2316, 2317, 2318);
     Collection<Integer> existingId = Arrays.asList(1004, 1762, 1892, 1342, 1942, 2316);

    Collection<Integer> similar = new HashSet<Integer>( id );
    similar.removeAll( existingId );
    System.out.println("Different:"+similar);
    System.out.println("#of items that are differnt:"+similar.size());