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In Java,the method HttpRequest.getParameter returns an objec

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In Java,the method HttpRequest.getParameter returns an object of which of the following classes?(
In Java,the method HttpRequest.getParameter returns an object of which of the following classes?
(a) Parameter
(b) String
(c) HttpRequest
(d) PrintWriter
说明下为什么
(b) String HttpRequest.getParameter 返回的类型是String.这个方法就是这么写的,用来接收参数的.