Deck 12: Overview of UML

Question 1

When a button is clicked, the processor executes the instructions in method actionPerformed for that button's listener object.

Answer 1

True

Question 2

JPanel cannot be used as a painting surface.

Answer 2

False

Question 3

A toolbar contains icons that can be selected by a mouse click.

Answer 3

True

Question 4

The layout manager can be specified as an argument of the JPanel constructor, or it can be set in any Container by calling the method flowLayoutManager.

Question 5

A button is a type of component.

Question 6

The Java API documentation uses the term ____________________ to represent the objects that are displayed on the screen and can interact with the user.

Question 7

Class ActionEvent is a subclass of the abstract class ____________________.

Question 8

A button is an object of the class ____________________.

Question 9

____________________ buffering allows for flicker-free updates at the cost of additional memory.

Question 10

All graphics coordinates are in units of ___________________.

Question 11

The ____________________ is the base class for all other Swing components, except the top-level containers JFrame, JDialog, JAPPlet, and JWindow.

Question 12

A(n) ____________________ is a method that is to be called when an action event occurs.

Question 13

To facilitate mutual exclusion, radio buttons are placed into a(n) ____________________.

Question 14

____ Layout places components in either a horizontal or vertical arrangement.

Question 15

The process by which an event listener is associated with an event is called ____________________ the listener for the event.

Question 16

All user interfaces are displayed within a(n) ____.

A) pixel
B) toolbar
C) window
D) actionListener

Question 17

The ____ class is an abstract class that provides the interface between the Java API and the physical device on which the image is created.

A) Graphics
B) Applet
C) Frame
D) Dialog

Question 18

A(n) ____ is a general-purpose intermediate component that is used to organize the other components.

A) Applet
B) Frame
C) Window
D) JPanel

Question 19

A primary purpose of the ____ API is to enable a programmer to develop a GUI for a Java application.

A) Window
B) Swing
C) actionListener
D) JPanel

Question 20

A(n) ____ combines a button or editable field and a drop-down list.

A) event
B) actionListener
C) Frame
D) combo box

Question 21

The Java API java.text contains the class ____, which can be used to format numbers either as pure numbers or as currency.

A) interface
B) NumberFormat
C) toolbar
D) layoutManager

Question 22

____ are used to give a common name to a family of interfaces and classes.

A) Marker interfaces
B) Events
C) Frames
D) Components

Question 23

Objects of class ____ must be placed in a containment hierarchy that is rooted in one of the top-level containers.

A) Swing
B) Frame
C) JComponent
D) Applet

Question 24

____ are triggered by making a selection from a list of items.

A) MouseEvents
B) JPanel events
C) ItemEvents
D) Applets

Question 25

The interface EventListener has no methods. Such interfaces are known as ____.

A) components
B) layouts
C) pixels
D) markers