Question $11$ pts

To respond to a button event, a listener must supply instructions for the $\_\_\_\_$ method of the ActionListener interface.

Group of answer choices

eventAction

actionPerformed

actionEvent

eventResponse

Flag question: Question $2$

Question $21$ pts

Which of the following can potentially be changed when implementing an interface?

Group of answer choices

The return type of a method in the interface.

The types of parameters of a method in the interface.

The name of a method in the interface.

You cannot change the name, return type, or types of parameters of a method in the interface.

Flag question: Question $3$

Question $31$ pts

Which of the following is true about a default method in an interface declaration?

Group of answer choices

A default method is a static method that does not have an implicit parameter.

A default method does not provide an implementation.

A class that implements the interface cannot override the default behavior.

A class that implements the interface can inherit the default behavior.

Flag question: Question $4$

Question $41$ pts

Use the $\_\_\_\_$ method to add a mouse listener to a component.

Group of answer choices

addActionListener

addMouseListener

addMouseActionListener

addListener

Flag question: Question $5$

Question $51$ pts

Assume that the TimerListener class implements the ActionListener interface. If the actionPerformed method in TimerListener needs to be executed once per second, what statement should be used to complete the following code segment?

ActionListener listener $=$ new TimerListener$()$;

$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_//$ missing statement

timer.start$()$;

Group of answer choices

Timer timer $=$ new Timer$($listener$)$;

Timer timer $=$ new Timer$(1000,$ listener$)$;

Timer timer $=$ new Timer$(1,$ listener$)$;

Timer timer $=$ new Timer$(100,$ listener$)$;

Flag question: Question $6$

Question $61$ pts

When you use a timer, you need to define a class that implements the $\_\_\_\_$ interface.

Group of answer choices

TimerListener

TimerActionListener

ActionListener

StartTimerListener

Flag question: Question $7$

Question $71$ pts

You wish to implement a callback method for an object created from a library class that you cannot change. What is the preferred way to accomplish this?

Group of answer choices

Extend the library class.

Use an inner class in the interface.

Create a new class that mimics the library class.

Use a helper class that implements the callback method.

Flag question: Question $8$

Question $81$ pts

Using the given definition of the Measurable interface:

public interface Measurable

$\{$

double getMeasure$()$;

$\}$

Consider the following code snippet, assuming that BankAccount has a getBalance method and implements the Measurable interface by providing an implementation for the getMeasure method:

Measurable m $=$ new Measurable$()$;

System.out.println$($m$.$getMeasure$())$;

Which of the following statements is true?

Group of answer choices

The code executes, displaying the measure of the Measurable object.

The code does not compile because interface types cannot be instantiated.

The code compiles but generates an exception at run time because getMeasure does not return a String.

The code compiles but generates an exception at run time because m does not reference a BankAccount object.

Flag question: Question $9$

Question $91$ pts

Which of the following statements about interfaces is NOT true?

Group of answer choices

An interface can supply a default implementation.

Interfaces can make code more reusable.

An interface can describe the state that should be maintained.

An interface describes the behavior that an implementation should supply.

Flag question: Question $10$

Question $101$ pts

Which of the following is an event source?

Group of answer choices

An inner class.

An event listener.

A JButton object.

An event adapter.

Flag question: Question $11$

Question $111$ pts

Consider the following code snippet:

public interface Measurable

$\{$

double getMeasure$()$;

$\_\_\_\_\_\_\_\_\_\_\_\_$ boolean largerThan$($Measurable other$)$

$\{$

return getMeasure$()>$ other.getMeasure$()$;

$\}$

$\}$

Which of the following completes the interface declaration correctly?

Group of answer choices

public

private

final

default

Flag question: Question $12$

Question $121$ pts

Assuming that interface Resizable is declared elsewhere, consider the following class declaration:

public class InnerClassExample

$\{$

public static void main$($String$[]$ args$)$

$\{$

class SizeModifier implements Resizable

$\{$

$//$ class methods

$\}$

$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_//$ missing statement

$\}$

$\}$

Which of the following declarations can be used to complete the main method?

Group of answer choices

SizeModifier something $=$ new Resizable$()$;

Resizable something $=$ new Resizable$()$;

Resizable something $=$ new InnerClassExamp