Free SCWCD Certification Practice Questions (CX-310-081), SCWCD 1.4 Mock Exams, SCWCD Study Aids

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SCWCD Certification Practice Test

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Free SCWCD Certification Practice Questions:

What will be the output of the following JSP page?

 <html><body>
   <% a = 100; %>
   <% int a = 200; %>
   <%! int a = 300; %>
   a = <%= a %>, <%= this.a %>
 </body></html>

A) a = 200, 100
B) a = 300, 100
C) a = 100, 200
D) a = 200, 300
E) The code will not compile as written

[Ans: A]
The JSP page will be translated into servlet code similar to the following:

public class ...._jsp extends HttpJspBase {

int a = 300;
public void _jspService(HttpServletRequest request, HttpServletResponse response)
throws java.io.IOException, ServletException

{

out.write("<html>");
out.write("<body>");

a = 100;
int a = 200;

out.write("a = ");
out.print( a);
out.write(", ");
out.print( this.a);

out.write("</body>");
out.write("</html>");
}

}

The <%! int a = 300; %> declaration will create a class-level instance variable "a", and initialize the variable to 300. The scriplet <% a = 100; %> will change the value of the class-level instance variable from 300 to 100.

The second scriplet, <% int a = 200 %>, will create a local variable "a" in the _jspService () method and set the initial value to be 200. The first expression <%= a %> refers to the local variable "a", which is 200.

The second expression <%= this.a %> uses the keyword this and refers to the class-level instance variable "a". The class-level instance variable "a" was set to 100 by the scriplet <% a = 100; %>. Hence, the correct answer is "a=200, 100"

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