In the sample Web Component Developer
test that Sun sells for $50, the answer to a similar question to the one below is given as [A]. (I�ve modified the question superficially to hopefully avoid any copyright infringements).
Shouldn�t the answer be D? The
Servlet 2.2 API documentation for the SingleThreadModel interface states, "this interface does not prevent synchronization problems that result from servlets accessing shared resources such as static class variables or classes outside the scope of the servlet".
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Question:
Given:
1. public class TestServlet extends HttpServlet implements SingleThreadModel {
2. private static int num = 5;
3. public void doGet(HttpServletRequest req, HttpServletResponse resp) {
4. // do nothing;
5. }
6. }
Which statement is true?
A) Variables num and req are both
thread safe
B) Variables num and req are both not thread safe
C) Variable num is thread safe, while variable req is not thread safe
D) Variable num is not thread safe, while variable req is thread safe
