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最新的 Java Technology 1Z0-858 免費考試真題:

1. Which two are true regarding a web application class loader? (Choose two.)

A) Resources in the WAR class directory or in any of the JAR files within the library directory may be accessed using the J2SE semantics of getResource.
B) A web application running in a J2EE product may override classes in the javax.* namespace.
C) A web application class loader may NOT override any classes in the java.* and javax.* namespaces.
D) Resources in the WAR class directory or in any of the JAR files within the library directory CANNOT be accessed using the J2SE semantics of getResource.
E) A web application may override the web container's implementation classes.

2. Given:
6.<% int[] nums = {42, 420, 4200};
7.request.setAttribute("foo", nums); %>
Which two successfully translate and result in a value of true? (Choose two.)

A) ${requestScope[foo][0] > 500}
B) ${(requestScope['foo'][0] lt 50) && (3 gt 2)}
C) ${true or false}
D) ${requestScope['foo'][1] = 420}

3. Given a JSP page:
11.
<n:recurse>
12.
<n:recurse>
13.
<n:recurse>
14.
<n:recurse />
15.
</n:recurse>
16.
</n:recurse>
17.
</n:recurse>
The tag handler for n:recurse extends SimpleTagSupport.
Assuming an n:recurse tag can either contain an empty body or another n:recurse tag, which strategy allows the tag handler for n:recurse to output the nesting depth of the deepest n:recurse tag?

A) It is impossible to determine the deepest nesting depth because it is impossible for tag handlers that extend SimpleTagSupport to communicate with their parent and child tags.
B) If the tag has a body, invoke the fragment for that body.Otherwise, start a counter at 1. Call getParent(). If it returns null, output the value of the counter Otherwise, increment the counter and continue from where getParent() is called.
C) Start a counter at 1. Call getChildTags(). If it returns null, output the value of the counter. Otherwise, increment counter and continue from where getChildTags() is called. Skip processing of the body.
D) Create a private non-static attribute in the tag handler class called count of type int initialized to 0. Increment count in the doTag method. If the tag has a body, invoke the fragment for that body. Otherwise, output the value of count.

4. A web application uses the HttpSession mechanism to determine if a user is "logged in." When a user supplies a valid user name and password, an HttpSession is created for that user.
The user has access to the application for only 15 minutes after logging in. The code must determine how long the user has been logged in, and if this time is greater than 15 minutes, must destroy the HttpSession.
Which method in HttpSession is used to accomplish this?

A) invalidateAfter
B) getCreationTime
C) getLastAccessedTime
D) getMaxInactiveInterval

5. Given the security constraint in a DD:
101.
<security-constraint>
102.
<web-resource-collection>
103.
<web-resource-name>Foo</web-resource-name>
104.
<url-pattern>/Bar/Baz/*</url-pattern>
105.
<http-method>POST</http-method>
106.
</web-resource-collection>
107.
<auth-constraint>
108.
<role-name>DEVELOPER</role-name>
109.
</auth-constraint>
110.
</security-constraint>
And given that "MANAGER" is a valid role-name, which four are true for this security constraint? (Choose four.)

A) DEVELOPER can do a TRACE on any resource in the /Bar/Baz directory.
B) DEVELOPER can do only a POST on resources in the /Bar/Baz directory.
C) MANAGER can do a TRACE on any resource in the /Bar/Baz directory.
D) MANAGER can do a POST on any resource in the /Bar/Baz directory.
E) MANAGER can do a GET on resources in the /Bar/Baz directory.
F) DEVELOPER can do a GET on resources in the /Bar/Baz directory.

問題與答案：