检查arraylist java中存在的映射键

Question

Wanted to check if the keys of the hashmap is present in the arrayList.

Tried the below and it working, but wanted to know if there are any other better solution.

public boolean check(Map<String, String> map) {
        Collection<String> list = new ArrayList<String>();
        list.add("One");
        list.add("Two");
        list.add("Three");
    
        for(String key: map.keySet()) {
            if(!list.contains(key)) {
                return false;
            }
        }
        return true;
    }

Answer 1

您可以使用Collection.containsAll() （也归功于@OH GOD SPIDERS ，因为他们几乎在同一秒的评论中提到了它）：

return list.containsAll(map.keySet());