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18 java.applet Reference

In this chapter:

Introduction to the

Reference Chapters

Package diagrams

Introduction to the Reference Chapters

The preceding seventeen chapters cover just about all there is to know about AWT. We have tried to organize them logically, and provide all the information that you would expect in a reference manual—plus much more in the way of examples and practical information about how to do things effectively. However, there are many times when you just need a reference book, pure and simple: one that"s organized alphabetically, and where you can find any method if you know the class and pack- age that it belongs to, without having to second guess the author"s organizational approach. That"s what the rest of this book provides. It"s designed to help you if you need to look something up quickly, and find a brief but accurate summary of what it does. In these sections, the emphasis is onbrief; if you want a longer description, look in the body of the book. The reference sections describe the following packages: java.applet(Chapter 18,java.applet Reference) java.awt(Chapter 1,java.awt Reference) java.awt.datatransfer(Chapter 20,java.awt.datatransfer Reference) java.awt.event(Chapter 21,java.awt.event Reference) java.awt.image(Chapter 22,java.awt.image Reference) java.awt.peer(Chapter 23,java.awt.peer Reference) Within each package, classes and interfaces are listed alphabetically. There is a description and a pseudo-code definition for each class or interface. Each variable and method is listed and described. New Java 1.1 classes are marked with a black 520

10 July 2002 22:24

star (?), as are new methods and new variables. Of course, if a class is new, all its methods are new. We didn"t mark individual methods in new classes. Methods that are deprecated in Java 1.1 are marked with a white star (?). Inheritance presents a significant problem with documenting object-oriented libraries, because the bulk of a class"s methods tend to be hiding in the super- classes. Even if you"re very familiar with object-oriented software development, when you"re trying to look up a method under the pressure of some deadline, it"s easy to forget that you need to look at the superclasses in addition to the class you"re interested in itself. Nowhere is this problem worse than in AWT, where some classes (in particular, components and containers) inherit well over 100 methods, and provide few methods of their own. For example, the

Buttonclass

contains seven public methods, none of which happens to be setFont(). The font used to display a button"s label is certainly settable—but to find it, you have to look in the superclass

Component.

So far, we haven"t found a way around this problem. The description of each class has an abbreviated class hierarchy diagram, showing superclasses (all the way back to Object), immediate subclasses, and the interfaces that the class implements. Ideally, it would be nice to have a list of all the inherited methods—and in other parts of Java, that"s possible. For AWT, the lists would be longer than the rest of this book, much too long to be practical, or even genuinely useful. Someday, electronic documentation may be able to solve this problem, but we"re not there yet.

Package diagrams

The following figures provide a visual representation of the relationships between the classes in the AWT packages. java.awt, as the mother of all AWT packages, is better represented by two dia- grams, one for the graphics classes and one for the component and layout classes.

INTRODUCTION521

10 July 2002 22:24

implements extends

INTERFACE

CLASSABSTRACT CLASS

java.lang

Button

CanvasCheckbox

Choice

Container

LabelList

Scrollbar

TextComponentWindow

MenuBar

MenuItem

Menu

CheckboxMenuItemDialog

FrameMenuContainerFileDialog

TextArea

TextFieldLayoutManager

Component

GridBagConstraints

MenuComponentAdjustable

MenuShortcut

CheckboxGroup

java.awt.image

ImageObserver

LayoutManager2

ScrollPane

PopupMenu

java.io

Serializeable

Object

CloneableItemSelectable

java.awt KEY Panel

BorderLayout

CardLayout

GridBagLayoutFlowLayout

GridLayout

Figure 18-1: Component and Layout classes of the java.awt package.522 java.applet Reference

10 July 2002 22:24

FINAL CLASSimplements

extends

INTERFACE

CLASSABSTRACT CLASS

KEY

Object

java.lang Color

FontMetrics

java.util

CloneableError

Exception

IllegalStateExceptionCursor

Dimension

Font

Graphics

Image

Insets

MediaTracker

Point

Polygon

Rectangle

ToolkitAWTEvent

AWTEventMulticaster

Event

EventQueue

PrintJob

java.io

Serializeable

EventObject

AWTError

AdjustmentListener

ComponentListener

ContainerListener

FocusListener

ItemListener

KeyListener

MouseListener

MouseMotionListener

TextListener

WindowListener

SystemColorShape

AWTException

java.awt.event java.awt

PrintGraphics

Figure 18-2: Graphics classes of java.awt packageI

NTRODUCTION523

10 July 2002 22:24

implements extendsCLASS

INFREQUENTLY USED

ABSTRACT CLASS

INTERFACE

Cloneable

java.awt.image

ImageFilterFilteredImageSource

MemoryImageSourceColorModel

java.lang

ImageConsumer

DirectColorModel

IndexColorModel

PixelGrabber

RGBImageFilterCropImageFilter

Object

ImageObserverImageProducer

ReplicateScaleFilter AreaAveragingScaleFilter

KEY

Figure 18-3: The java.awt.image package

implements extends

INTERFACE

CLASS java.awt.datatransfer

Clipboard

DataFlavor

java.lang

StringSelection

Object

ClipboardOwner

UnsupportedFlavorExceptionException

KEY

Transferable

Figure 18-4: The java.awt.datatransfer package524 java.applet Reference

10 July 2002 22:24

implements extends

INTERFACE

CLASSABSTRACT CLASS

Object

java.lang

ActionEvent

java.util

AWTEventComponentListener

ContainerListener

FocusListener

KeyListener

MouseListener

MouseMotionListener

TextListenerItemListener

WindowListener

java.awt.event KEY

ActionListener

AdjustmentListener

java.awt

ComponentAdapter

ContainerAdapter

FocusAdapter

KeyAdapter

MouseAdapter

MouseMotionAdapter

WindowAdapter

AdjustmentEvent

ComponentEvent

ItemEvent

TextEventContainerEvent

FocusEvent

InputEvent

PaintEvent

WindowEventKeyEvent

MouseEvent

EventListener

Figure 18-5: The java.awt.event packageI

NTRODUCTION525

10 July 2002 22:24

KEY extendsINTERFACEINFREQUENTLY USED

FontPeer

ComponentPeer

java.awt.peer

ButtonPeer

CanvasPeer

CheckboxPeer

ChoicePeer

ContainerPeer

LabelPeer

ListPeer

ScrollbarPeer

TextComponentPeerWindowPeer

ScrollPanePeer

FramePeer

DialogPeer FileDialogPeer

TextFieldPeer

TextAreaPeer

MenuComponentPeer

MenuBarPeer

MenuItemPeer

PanelPeer

PopupMenuPeer

Figure 18-6: The java.awt.peer package

CLASS

INTERFACE

ABSTRACT CLASS

INFREQUENTLY USEDimplementsextends

Component Container PanelAppletAudioClipAppletStubAppletContext java.applet java.awtjava.lang KEY

Object

Figure 18-7: The java.applet package526 java.applet Reference

10 July 2002 22:24

18.1 Applet

java.awt.Componentjava.lang.Object java.awt.Container java.awt.Paneljava.applet.Applet

Description

TheAppletclass provides the framework for delivering Java programs within web pages.

Class Definition

public class java.applet.Applet extends java.awt.Panel { // Constructorsquotesdbs_dbs17.pdfusesText_23