The getProperty method returns an instance of the class Object, so you must cast the result into the appropriate type, which, in this case, is a string.
getProperty方法返回Object类的一个实例，因此您必须把结果转换成合适的类型，在本例中是 string 型。
GetException : This method returns an exception which allows you to nest exceptions for later retrieval. You can stuff your own custom exception in here and pass on information to calling programs.
getException：该方法返回一个Exception，允许在其中嵌套用于后期恢复的异常，可以将自定义的异常填充在这里，为调用程序传递信息。
This method returns a Response object, from which you can retrieve a Document.
这个方法会返回一个Response对象，我们可以从中检索Document。
This method returns the DiscoveryInformation object that describes the results of the discovery (you may treat this object as opaque).
这种方法返回DiscoveryInformation对象，它用来描述发现的结果(您可将该对象看作不透明对象)。
For example, if you attempt to pick an image from the user's library and the library is empty, this method returns NO.
举个例子，如果你想要从用户的库中去取得一个图片，但是这个库是空的，那么这个方法将会返回NO。
This method returns a byte array which you can then save to an output file, such as an image file or an Excel spreadsheet, depending on the requested format.
该方法返回一个可以在以后保存到输出文件的字节数组；取决于请求的格式，输出文件可以是图形文件或Excel电子表格。
You can use this deferred object for defining a callback method when the asynchronous call returns a response.
我们可以使用这个deferred对象来定义一个在异步调用返回响应时执行的回调函数。
You can use this method to write a method that returns a collection of nodes, yielding each node as the node is read from the reader.
您可以使用这个方法来撰写传回节点集合的方法，同时产生的每个节点都会做为从读取器读取的节点。
This method returns a result set based on the restrictions that you specify.
这个方法会根据您指定的限制传回结果集。
This method returns a result set based on the restrictions that you specify.
这个方法会根据您指定的限制传回结果集。
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