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我需要一个线程安全的地图,我有这样的东西:(我对java很新)

 public static class Manager
        {
        static 
        {
//something wrong here, doesn't compile
           list = new java.util.Collections
          .synchronizedMap(new Map<String, Client>());
        }

       static Map<String,Client> list;

        public static void AddClient(Client client)
        {
        // thread safe add client to the list
        }

        public static void RemoveClient(Client client)
        {
        // thread safe remove client to the list
        }

        }