Java Final

Attempt 1

Written: Mar 4, 2014 3:37 PM - Mar 4, 2014 4:34 PM

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Question 1

4 / 4 points

Which of the following are Java IDE development tools?

				google
				Eclipse
				yahoo
				DrJava
Question 2					5 / 5 points

Write java code to define an interface called ValuableAsset.

The interface should have one method called getMarketValue.

The method getMarketValue takes no parameters and returns the value, in dollars, of the asset that implements this interface.

Public class getMarketValue extends ValuableAsset {
getMarketValue = ValuableAsset
Public double getMarketValue();
}

The correct answer is not displayed for Long Answer type questions.

Question 3

2 / 2 points

Consider the following java classes ( GreenBuilding and GGCbuilding):

public class GreenBuilding implements EnergyEfficiency, ValuableAsset


public class GGCbuilding extends GreenBuilding

Is the following statement correct in java?

      ValuableAsset  xBuilding = new GGCbuilding();

			True
			False
Question 4				1 / 1 point

Consider the following java classes ( GreenBuilding and GGCbuilding):

public class GreenBuilding implements EnergyEfficiency, ValuableAsset


public class GGCbuilding extends GreenBuilding

Is the following statement correct in java?

      EnergyEfficiency  yBuilding = new GGCbuilding();

			True
			False
Question 5				2 / 2 points

Consider the following java classes ( GreenBuilding and GGCbuilding):

public class GreenBuilding implements EnergyEfficiency, ValuableAsset


public class GGCbuilding extends GreenBuilding

Is the following statement correct in java?

       ValuableAsset  zBuilding = new EnergyEfficiency();

			True
			False
Question 6				2 / 2 points

Which of the following statements is correct?

			A class can implement only one interface type.
			All fields in an interface are private.
			A class can NOT implement an interface type.
			A class can implement more than one interface type.
Question 7			2 / 2 points

Which of the following is true regarding subclasses?

			A subclass inherits methods from its superclass but not instance variables.
			A subclass does not inherit methods or instance variables from its superclass.
			A subclass inherits methods and instance variables from its superclass.
			A subclass inherits instance variables from its superclass but not methods.
Question 8			2 / 2 points

Use the

___super___

keyword to call a constructor in the superclass.

Question 9

2 / 2 points

Interface and Class are interchangeable terms.

			True
			False
Question 10				2 / 2 points

A java class can have more than one super class by using

public class MyClass extends ClassA, ClassB, ClassC

{

}

			True
			False
Question 11				4 / 4 points

The following question refers to the following code:

Treat.java	HairballRemedy.java	ScoobyTreat.java
public interface Treat {         String getColor();         String getSize(); }	public class HairballRemedy implements Treat {         public String getColor()         {                return "blue";         }         public String getSize()         {                return "0.5 oz";         } }	public class ScoobyTreat implements Treat {         public String getColor()         {                return "green";         }         public String getSize()         {                return "2 oz";         } }

Munchies.java

public class Munchies {         public static void main(String[] args)         {                HairballRemedy a=new HairballRemedy();                ScoobyTreat b=new ScoobyTreat();                Treat c=a;                Treat d=b;                System.out.println(a.getColor());                System.out.println(b.getColor());                System.out.println(c.getColor());                System.out.println(d.getColor());                     } }

When running Munchies, the output is four lines. In each of the four lines blanks below, provide the output.

___blue___(25 %)

___green___(25 %)

___blue___(25 %)

___green___(25 %)

Question 12

4 / 4 points

7. To use an interface, a class header should include which of the following?

			The keyword implements and the name of the interface
			The keyword extends and the name of the interface
			The keyword implements and the name of an abstract method in the interface
			The keyword extends and the name of an abstract method in the interface
Question 13			2 / 2 points

_____________is defined as the behavior can vary depending on the actual type of an object .

			Packaging
			Polymorphism
			Casting
			Instantiation
Question 14				2 / 2 points

____ occurs when a single class has several methods with the same name but different parameter types.

			Overloading
			Inheritance
			Instantiation
			Casting
Question 15				2 / 2 points

Inheritance is the ability to define a new class using an existing class as the basis.

			True
			False
Question 16				2 / 2 points

The

___extends___

keyword is used in Java for deriving a subclass from an existing class.

Question 17

2 / 2 points

In Java, a class that is defined without an explicit extends clause

			has no superclass
			is a subclass of Object
			is a syntax error
			is its own superclass
Question 18				2 / 2 points

When declared as protected, data in a class cannot be accessed by all of its subclasses.

			True
			False
Question 19				2 / 2 points

When declared as protected, methods in a class can only be accessed by all of its subclasses.

			True
			False
Question 20				4 / 4 points

Match the following with the best answer:

__2__ A method that is invoked by a class is __1__ A method that is invoked by an object is			1. instance 2. static
Question 21			0 / 4 points

Match the following with the appropriate term using the code below:

public class Son extends Dad
{
}

__2__ (1) Son __1__ (2) Dad			1. subclass 2. superclass
Question 22				2 / 2 points

Consider the following java classes ( Building and Skyscraper):

public class Building
{
      String address = "1234 Main St";
}



public class Skyscraper extends Building
{
      int topFL = 101;
}

Is the following statement correct in java?

      Building  mybuilding = new Skyscraper();

			True
			False
Question 23				2 / 2 points

Consider the following java classes ( Building and Skyscraper):

public class Building
{
      String address = "1234 Main St";
}



public class Skyscraper extends Building
{
      int topFL = 102;
}

Is the following statement correct in java?

      Skyscraper  myFavorite = new Building();

			True
			False
Question 24				2 / 2 points

Consider the following java classes ( Building and Skyscraper):

public class Building
{
      String address = "1234 Main St";
}



public class Skyscraper extends Building
{
      int topFL = 103;
}

Is the following statement correct in java?

      Skyscraper  tinySmallHouse = new Skyscraper();

			True
			False
Question 25				4 / 4 points

Given the following class definition, which of the following are considered part of the class's public interface?

public class CashRegister

{

public static final double DIME_VALUE = 0.1;

private static int objectCounter;

public void updateDimes(int dimes) {…}

private boolean updateCounter(int counter) {…}

}

			DIME_VALUE and objectCounter
			objectCounter and updateCounter
			DIME_VALUE and updateDimes
			updateDimes and updateCounter
Question 26				2 / 2 points

A(n)

___class___

should represent a single concept from the problem domain, such as business, science, or mathematics.

Question 27

2 / 2 points

The CustomerAccount as discussed in our class is an immutable class.

			True
			False
Question 28				2 / 2 points

Math is an immutable class.

			True
			False
Question 29				4 / 4 points

A static method can have which of the following types of parameters?

			Both implicit and explicit parameters.
			Only explicit parameters.
			Only implicit parameters.
			A static method cannot have parameters.
Question 30				2 / 2 points

An input into a parameter of type double can potentially be changed by a Java method.

			True
			False
Question 31				2 / 2 points

A parameter of type LoyalCustomerAccount (as discussed in class) can potentially be changed by a Java method.

			True
			False
Question 32				2 / 2 points

If you do not include a package statement at the top of your class source file, its classes will be placed in which package?

			the default package, which has no name
			java.lang
			java.awt
			java.util
Question 33				4 / 4 points

Choose the valid packages from the Java Platform:

				javax.swing
				java.util (utility)
				java.system
				java.lang.Math
Question 34					4 / 4 points

Take your favorite Product.java class from our lab practices,

sketch an .toSting() method to overide the default print output.

public class Product
{
public String name;
public String serialN;
public double price;

public override String ToString()
{
return price + " " + serailN + " " + " " + name;

}
}

The correct answer is not displayed for Long Answer type questions.

Question 35

2 / 2 points

Related classes in the standard library are organized into

___packages___

.

Question 36

4 / 10 points

Sketch java codes to implement a Comparable<T> interface inside a Product.java class such that the products could be ranked by serial #s.

Then override the .toString() method inside the Product.java class to printout the product object reference, the product serial#, and the product name.

public class Product
{
public String name;
public String serialN;

public override String ToString()
{
return serialN + " " +name;

}
}

The correct answer is not displayed for Long Answer type questions.