java - 为什么这张地图中的旧数据被删除了？

Question

我有这个代码。所以，我不明白为什么要删除哈希图中的旧数据 - 在 result.put(name, localMap)

class FilterServers  {

     // In this class, we filter our servers on our key word

    static Map <String, Map <String, String>>
    getValues(String keyWord, List <Map <String, Map <String, Monitor.Status>>> servers) {
        Map <String, Map <String, String>> result = new ConcurrentHashMap<>();
        Pattern pattern = Pattern.compile(keyWord, Pattern.CASE_INSENSITIVE);
        Matcher keyMatcher;
        Matcher valueMatcher;
        for (Map <String, Map<String, Monitor.Status>> server : servers) {
            Map <String, String> localMap = new ConcurrentHashMap<>();
            boolean haveResult = false;
            Set <String> serverName = server.keySet();
            Optional <String> optional = serverName.stream().findAny();
            String name = optional.get();
            for (Map <String, Monitor.Status> subServer : server.values()) {
                for (Map.Entry<String, Monitor.Status> entry: subServer.entrySet()) {
                    Monitor.Status targetValue = entry.getValue();
                    String targetKey = entry.getKey();
                    keyMatcher = pattern.matcher(targetKey);
                    valueMatcher = pattern.matcher(targetValue.getProblem());
                    if (keyMatcher.find() || valueMatcher.find()) {
                        localMap.put(targetKey, targetValue.getProblem());
                        haveResult = true;
                    }
                }
            }
            if(haveResult){
                result.put(name, localMap);
            }
        }
        return result;
    }
}

标签： javahashmap

Answer 1

我发现键（名称）中出现了相同的字符串。而且由于哈希映射会摩擦已经具有相同键的旧值，因此它们被我删除了。我只是交换了键和值