public static <K, V> V getValue(Map<K, V> map, K key) {
        if (map == null) {
            return null;
        }
        return map.get(key);
    }
@author Robert HG (254963746@qq.com) on 6/23/14.
lts-core/src/main/java/com/github/ltsopensource/core/commons/utils/CollectionUtils.java