Programming languages | Practice Questions

Multiple choice technology programming languages

The process of writing the state of an object to a byte stream is called as

Deserialization
Serialization
Interface
All of the Above

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Multiple choice technology programming languages

servlet.xml is the file used to define a servlet mapping

True
False

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Multiple choice technology programming languages

Through _________ , you can control what parts of a program can access the members of a class

Encapsulation
Class
Inheritance
Polymorphism

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Multiple choice technology programming languages

In order for a source code file, containing the public class Test, to successfully compile, which of the following must be true?

It must have a package statement
It must be named Test.java
It must import java.lang
It must declare a public class named Test

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Multiple choice technology programming languages

Given the JSP code: <% request.setAttribute("foo", "bar"); %> and the Classic tag handler code: 5. public int doStartTag() throws JspException { 6. // insert code here 7. // return int 8. } Assume there are no other "foo" attributes in the web application. Which invocation on the pageContext object, inserted at line 6, assigns "bar" to the variable x?

String x = (String) pageContext.getAttribute("foo");
String x = (String) pageContext.getRequestScope("foo");
It is NOT possible to access the pageContext object from within doStartTag.
String x = (String)

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Multiple choice technology programming languages

Given: 11. List list = // more code here 12. Collections.sort(list, new MyComparator()); Which code will sort this list in the opposite order of the sort in line 12?

Collections.reverseSort(list, new MyComparator());
Collections.sort(list, new MyComparator());
Collections.sort(list, new InverseComparator(
Collections.sort(list, Collections.reverseOrder(

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Multiple choice technology programming languages

Given: 11. public static void append(List list) { list.add(”0042”); } 12. public static void main(String[] args) { 13. List intList = new ArrayList(); 14. append(intList); 15. System.out.println(intList.get(0)); 16. } ‘What is the result?

42
0042
An exception is thrown at runtime
Compilation fails because of an error in line 13

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Multiple choice technology programming languages

Given: classA {} class B extends A {} class C extends A {} class D extends B {} Which three statements are true? (Choose three.)

The type List is assignable to List<A>.

The type List<Object> is assignable to List<?>.

The type List<D> is assignable to List<? extends B>.

The type List<? extends B> is assignable to List<? extends A>.

The type List<Object> is assignable to any List reference.

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B,C,D Correct answer

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Multiple choice technology programming languages

A programmer has an algorithm that requires a java.util.List that provides an efficient implementation of add(0,object), but does NOT need to support quick random access. What supports these requirements?

java.util.Queue

java.util.ArrayList

java.util.LinearList

java.util.LinkedList

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D Correct answer

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Multiple choice technology programming languages

Servlet A receives a request that it forwards to servlet B within another webapplication in the same web container. Servlet A needs to share data with servlet B and that data mustnot be visible to other servlets in A's web application. In which object can the data that A shares with Bbe stored?

HttpSession

ServletConfig

ServletContext

HttpServletRequest

HttpServletResponse

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D Correct answer

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