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Unit- 3: The Web Container Model
Q21. Servlet A forwarded a request to servlet B using the forward method of RequestDispatcher. What attribute in B's request object contains the URI of the original request received by servlet A?
A. REQUEST_URI
B. javax.servlet.forward.request_uri
C. javax.servlet.forward.REQUEST_URI
D. javax.servlet.request_dispatcher.request_uri
E. javax.servlet.request_dispatcher.REQUEST_URI
Answer: B
Q22.One of the use cases in your web application uses many session-scoped attributes. At the end of the use case, you want to clear out this set of attributes from the session object. Assume that this static variable holds this set of attribute names:
201. private static final Set<String> USE_CASE_ATTRS;
202. static {
203. USE_CASE_ATTRS.add("customerOID");
204. USE_CASE_ATTRS.add("custMgrBean");
205. USE_CASE_ATTRS.add("orderOID");
206. USE_CASE_ATTRS.add("orderMgrBean");
207. }
Which code snippet deletes these attributes from the session object?
A. session.removeAll(USE_CASE_ATTRS);
B. for ( String attr : USE_CASE_ATTRS ) {
session.remove(attr);
}
C. for ( String attr : USE_CASE_ATTRS ) {
session.removeAttribute(attr);
}
D. for ( String attr : USE_CASE_ATTRS ) {
session.deleteAttribute(attr); }
E. session.deleteAllAttributes(USE_CASE_ATTRS);
Answer: C
Q23. You need to store a floating point number, called Tsquare, in the session scope. Which two code snippets allow you to retrieve this value? (Choose two.)
A. float Tsquare = session.getFloatAttribute("Tsquare");
B. float Tsquare = (Float) session.getAttribute("Tsquare");
C. float Tsquare = (float) session.getNumericAttribute("Tsquare");
D. float Tsquare = ((Float) session.getAttribute.("Tsquare")).floatValue();
E. float Tsquare = ((Float) session.getFloatAttribute.("Tsquare")).floatValue;
F. float Tsquare = ((Float) session.getNumericAttribute.("Tsquare")).floatValue;
Answer: B, D
Q24. You need to store a floating point number, called Tsquare, in the session scope. Which two code snippets allow you to retrieve this value? (Choose two.)
A. float Tsquare = session.getFloatAttribute("Tsquare");
B. float Tsquare = (Float) session.getAttribute("Tsquare");
C. float Tsquare = (float) session.getNumericAttribute("Tsquare");
D. float Tsquare = ((Float) session.getAttribute.("Tsquare")).floatValue();
E. float Tsquare = ((Float) session.getFloatAttribute.("Tsquare")).floatValue;
F. float Tsquare = ((Float) session.getNumericAttribute.("Tsquare")).floatValue;
Answer: B, D
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