都是可存储数据 对象的容器
Hashtable: maps keys to values. Any non-null object can be used as a key or as a value
同步，不允许为空Vector: implements a growable array of objects. Like an array, it contains components that can be accessed using an integer index. However, the size of a Vector can grow or shrink as needed to accommodate adding and removing items after the Vector has been created.
是可变长度的动态数组具体方法可参照API
Hashtable: maps keys to values. Any non-null object can be used as a key or as a value
同步，不允许为空Vector: implements a growable array of objects. Like an array, it contains components that can be accessed using an integer index. However, the size of a Vector can grow or shrink as needed to accommodate adding and removing items after the Vector has been created.
是可变长度的动态数组具体方法可参照API
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