java中HashTable,Vector,TreeSet,LinkedList哪些线程是安全的()。
有关hashMap跟hashTable的区别,说法正确的是()。
HashMap和HashTable的描述,错误的是()。
HashMap和Hashtable正确的说法有()
HashMap和Hashtable区别?
you have recently written the code shown below: Hashtable emailAddresses = new Hashtable ( ); emailAddresses.Add ("Mia", "mia@ Certkiller .com"); emailAddresses.Add ("Andy", "andy@ Certkiller .com"); emailAddresses.Add ("Kara", "kara@ Certkiller .com"); You need to ensure that these e-mail addresses are stored in the Email.dat file so that you can load them again when the user restarts the application. What should you do?()
You have recently written the code shown below: Hashtable emailAddresses = new Hashtable ( ); emailAddresses.Add ("Mia", "mia@ Certkiller .com"); emailAddresses.Add ("Andy", "andy@ Certkiller .com"); emailAddresses.Add ("Kara", "kara@ Certkiller .com"); FileStream stream = new FileStream ("Email.dat", FileMode.Create); BinaryFormatter formatter = new BinaryFormatter ( ); formatter.Serialize (stream, emailAddresses); You need to ensure that you are able to load the emailAddresses object from the Email.dat file into your application. What should you do?()
程序员已经创建了一个类,该类的实例可以用做Hashtable 的键(key)。哪两项是对的?()
简述HashMap和Hashtable的区别。
哈希表(HashTable)