怎么确定引用的类型？（确定一个Object引用具体是什么）
我从别人那里得到了一个引用，是object类型的，想通过某种方法查看这个引用具体是哪种类型的，请问使用什么方法？

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getClass()
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Class<? extends String> java.lang.Object.getClass()
Returns the runtime class of an object. That Class object is the object that is locked by static synchronized methods of the represented class. 

Returns:
The java.lang.Class object that represents the runtime class of the object. The result is of type Class where X is the erasure of the static type of the expression on which getClass is called.