Java elance Upwork (oDesk) TEST ANSWER (2015-2016)

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Question:

SQLException has a feature of chaining - identify the right code to execute the same from the following options:

Answers:

catch(SQLException e) { out.println(e.getMessage()); while((e=e.getNextException())!=null) { out.println(e.getMessage()); } }

Question:

Which statements are true regarding ServletContext Init Parameters in the deployment descriptor?

Answers:

They are set at deployment-time and can be updated at run-time.

Question:

JDBC is based on:

Answers:

X/Open CLI (Call Level Interface)

Question:

Which option lists Java access modifiers in the right order from the most permissive to the most restrictive?

Answers:

public, protected, no modifier/default/package, private

Question:

X.509 version 3 specifies which of the following?

Answers:

A format and content for digital certificates.

Question:

Select all true statements:

Answers:

An abstract class can have non-abstract methods.

Question:

Which option could be used to see additional warnings about code that mixes legacy code with code that uses generics?

Answers:

Xlint:unchecked

Question:

The principal finder method that must be implemented by every entity bean class is:

Answers:

findByPrimaryKey()

Question:

Which of the following methods are members of the Vector class and allow you to input a new element?

Answers:

addElement

Question:

There are three classes named A, B, and C. The class B is derived from class A and class C is derived from B. Which of the following relations are correct for the given classes?

Answers:

Any instance of B is an instance of A.

Question:

Choose all valid forms of the argument list for the FileOutputStream constructor shown below:

Answers:

FileOutputStream( File f )

Question:

Which of the following are the methods of the Thread class?

Answers:

yield()

Question:

Which of the following statements regarding abstract classes are true?

Answers:

The abstract class may have method implementation.

Question:

Which of the following methods should be invoked by the container to get a bean back to its working state?

Answers:

EJBActivate()

Question:

The JDK comes with a special program that generates skeleton and stub objects that is known as:

Answers:

rmic

Question:

In which class is the notify method defined?

Answers:

Object

Question:

Which exception must a setter of a constrained JavaBean property throw to prevent the property value from changing?

Answers:

PropertyVetoException

Question:

Which statements are true? Select all true statements.

Answers:

A method can be declared synchronized.

Question:

What is the result of an attempt to compile and run the given program? public class Test107 { public static void main(String[] args) { System.out.println(test()); } private static int test() { return (true ? null : 0); } }

Answers:

It compiles, but throws NullPointerException at run-time.

Question:

Which of these interfaces is the most applicable when creating a class that associates a set of keys with a set of values?

Answers:

Map

Question:

Which design pattern reduces network traffic by acting as a caching proxy of a remote object?

Answers:

value object

Question:

What protocol is used by the DatagramSocket class?

Answers:

UDP

Question:

Which of these is not an event listener adapter defined in the java.awt.event package?

Answers:

ActionAdapter

Question:

Which of the following methods can be used for reporting a warning on a Connection object, Statement object & ResultSet object?

Answers:

getWarnings()

Question:

Which of the following is the correct syntax for creating a Session object?

Answers:

HttpSession ses=request.getSession();

Question:

Which of the following are valid ways to define a thread in Java?

Answers:

Create a subclass of java.lang.Thread class

Question:

Assuming the servlet method for handling HTTPGET requests is doGet(HttpServletRequest req, HTTPServletResponse res), how can the request parameter in that servlet be retrieved?

Answers:

String value=req.getParameter("product");

Question:

Which of the following statements is true?

Answers:

public interface RemoteTrain extends java.rmi.Remote