programming

Question 1 1 pts Skip to question text.

As part of a bank account implementation, there is an account class and a checking account class. These two classes should be related by:

	polymorphism
	abstract classes

	both composition and inheritance
	inheritance

composition

 

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Question 2 1 pts

When using OOP, which of the following terms refers to a mechanism for a behavior, basically how it’s implemented?

	composition
	inheritance

	polymorphism
	dynamic binding

 

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Question 3 1 pts

To access an element in an Array object,

	Use the ArrayList's get() method.
	Use the ArrayList's element() method.

	Individual elements in an ArrayList can’t be accessed without doing a sequential query getSequential(), returning every element up to and including the element requested.
	Use square brackets around an index value.

 

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Question 4 1 pts

To access an element in an ArrayList object,

	Use square brackets around an index value.
	Use the ArrayList element() method.

	Use the ArrayList get() method.
	Individual elements in an ArrayList can’t be accessed without doing a sequential query getSequential(), returning every element up to and including the element requested.

 

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Question 5 1 pts

What term below is defined as a message that tells the program that something has happened?

	an interaction
	a listener

	an action
	an event

 

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Question 6 1 pts

Which item below is defined as an object?

	A String
	An Array

	All of the above
	An ArrayList

 

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Question 7 1 pts

When a text-box-enter event occurs, which method and parameter are required to handle this type of action? (1 point)

	actionEvent with an actionperformed parameter
	actionListener with an interfaceID parameter

	windowListener with an eventID parameter
	actionPerformed with an actionEvent parameter

 

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Question 8 1 pts

Which class includes the setTitle and setSize methods?

	JFrame
	JWindow

	JBox
	JOptionpane

 

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Question 9 1 pts

Before utilizing the binary search method, __________ must be done to the array?

	indexing
	splitting

	sorting
	importing

 

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Question 10 1 pts

Which layout manager implements a one-compartment layout scheme?

	GridlessLayout
	GridBagLayout

	GridLayout
	FlowLayout

BorderLayout

 

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Question 11 1 pts

What is the default layout manager for a JFrame window?

	GridBagLayout
	GridLayout

	FlowLayout
	GridlessLayout

BorderLayout

 

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Question 12 1 pts

To call the superclass constructor, super() must be the first line in a constructor.

	True
	False

 

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Question 13 1 pts

Method overriding is when a method has the same name, same sequence of parameter types, and the same return type as a method in a superclass.

	True
	False

 

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Question 14 1 pts

Type casting, also known as promotion is considered an implicit conversion.

	True
	False

 

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Question 15 1 pts

An abstract method declaration should always be defined as public as it is meant to be inherited into a subclass to be correctly used.

	True
	False

 

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Question 16 1 pts

When using parseInt() to convert a string to a number, NumberFormatException is thrown if a non-integer argument is found.

	True
	False

 

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Question 17 1 pts

enableEdit() is used to allow a user to edit the contents of a JTextField.

	True
	False

 

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Question 18 1 pts

Write the statement to print to the screen the 6th element of the array defined below?

Integer [ ] priceList = new Integer [10];

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Question 19 1 pts

Declare and initialize an ArrayList of type Double and call this ArrayList stocks.

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Question 20 1 pts

Write the code on a single line to display the dialog box below. Error! Filename not specified.

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Question 21 1 pts Skip to question text.

Write the code on a single line to display the input box below. Save the results into a variable called “input". Error! Filename not specified.

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Question 22 4 pts Skip to question text.

Declare (do not initialize) two arrays:

1. One array called “myNumbers” will hold the values: 1.23, 3.14, 5.18, 82, 2.56. The array should not have any additional empty elements.

2. One array called “myNames” will hold the values: Tom, Bob, John, Steve. The array should not have any additional empty elements.

Proper syntax is required

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Question 23 2 pts Skip to question text.

Assume that this code fragment compiles and runs. What is its output? As always, be precise when showing your output.

 public static void main(String [] args)

   {

          int x = 3;

          int xf = 0;

 

          if (x == 0 || x == 1)

          {

                 xf = 1;

          }

          else

          {

                 xf = 1;

                 for (int i=2; i<=x; i++)

              {

                     xf *= i;

              }

          }

          System.out.println("Results are: " + xf);

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Question 24 2 pts Skip to question text.

Assume that this program compiles and runs. Assume that the user enters 5 6 (separated by a space) for input. What is the output? As always, be precise when showing your output.

import java.util.Scanner;

public class TryCatchQuestion

{

   public static void main(String [] args)

   {

       Scanner stdIn = new Scanner(System.in);

       System.out.println("Please enter 2 numbers seperated by a space");

       try

       {

          System.out.println("Output: " + stdIn.nextInt() / stdIn.nextInt());

       }

       catch (NumberFormatException e)

       {

          System.out.println("Number Format Exception");

       }

       catch (ArithmeticException e)

       {

          System.out.println("Division by zero");

       }

       catch (Exception e)

       {

          System.out.println("Other Exception");

       }

   }//end main

}//end TryCatchQuestion

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Question 25 2 pts Skip to question text.

Assume that this program compiles and runs. Assume that the user enters 5 0 (separated by a space) for input. What is the output? As always, be precise when showing your output.

import java.util.Scanner; public class TryCatchQuestion

{

   public static void main(String [] args)

   {

       Scanner stdIn = new Scanner(System.in);

       System.out.println("Please enter 2 numbers seperated by a space");

       try

       {

          System.out.println("Output: " + stdIn.nextInt() / stdIn.nextInt());

       }

       catch (NumberFormatException e)

       {

          System.out.println("Number Format Exception");

       }

       catch (ArithmeticException e)

       {

          System.out.println("Division by zero");

       }

       catch (Exception e)

       {

          System.out.println("Other Exception");

       }

   }//end main

}//end TryCatchQuestion

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Question 26 2 pts Skip to question text.

Assume that this program compiles and runs. Assume that the user enters 5 six (separated by a space) for input. What is the output? As always, be precise when showing your output.

import java.util.Scanner;

public class TryCatchQuestion

{

   public static void main(String [] args)

   {

       Scanner stdIn = new Scanner(System.in);

       System.out.println("Please enter 2 numbers seperated by a space");

       try

       {

          System.out.println("Output: " + stdIn.nextInt() / stdIn.nextInt());

       }

       catch (NumberFormatException e)

       {

          System.out.println("Number Format Exception");

       }

       catch (ArithmeticException e)

       {

          System.out.println("Division by zero");

       }

       catch (Exception e)

       {

          System.out.println("Other Exception");

       }

   }//end main

}//end TryCatchQuestion

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Question 27 3 pts Skip to question text.

Provide code that adds "Hello!" and "Goodbye." messages to the JFrame window so that the resulting window looks like this: Error! Filename not specified.

You may assume that the JFrame window has been created using its default layout manager. Provide only two statements – one statement creates "Hello!" and adds it to the window and one statement creates "Goodbye." and adds it to the window. Do not provide extra code. In particular, you should not provide code for window settings (size, title, etc.), and you should not provide code for a listener. (3 points)

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Question 28 14 pts Skip to question text.

Provide the code for a class called Coin.java that implements the main method provided below.

       public static void main(String [] args)

       {

             Coin toss = new Coin();

             for (int x = 0; x < 1000; x++)

                    toss.flip();

             Coin.results();

       }//end main

When the program runs, the following random output should be produced: (numbers will vary as are random)

Heads: 494 Tails: 506

Program specific requirements:

· Style is require but comments are NOT required. 1 pt

· Include appropriate import statements for your file. 1 pt

· Utilize a constant class array to hold “Heads” and “Tails” 1 pt

· Declare a class ArrayList called flips that will hold integer values, 0 for heads and 1 for tails 1 pt

· Create a flips method that performs the following: 4 pts

· Initializes an instance of the Random class and a random variable

· Stores a random variable either 0 or 1

· Store the random number in the flips ArrayList

· Create a results method that performs the following: 6 pts

· Declare variable to hold number of heads flipped

· Utilize a for loop to iterate through the ArrayList (do NOT hard code the size here)

· For each iteration, increment the result from the ArrayList into a variable called heads

· Output the number of Heads using the constant array for the “Heads” heading along with the number of heads flipped

· Output the number of Tails using the constant array for the “Tails” heading along with the number of tails calculated from the size of the array minus the number of heads