Class BouncingBall

java.lang.Object
  java.awt.Component
      java.awt.Container
          java.awt.Panel
              java.applet.Applet
                  BouncingBall

All Implemented Interfaces:

java.awt.image.ImageObserver, java.awt.MenuContainer, java.io.Serializable, java.lang.Runnable, javax.accessibility.Accessible

public class BouncingBall
extends java.applet.Applet
implements java.lang.Runnable

A class shows a ball moving inside a rectangular box

Since:

JDK 1.4

See Also:

Applet reference, Runnable reference, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.applet.Applet

java.applet.Applet.AccessibleApplet

Nested classes/interfaces inherited from class java.awt.Panel

java.awt.Panel.AccessibleAWTPanel

Nested classes/interfaces inherited from class java.awt.Container

java.awt.Container.AccessibleAWTContainer

Nested classes/interfaces inherited from class java.awt.Component

java.awt.Component.AccessibleAWTComponent, java.awt.Component.BltBufferStrategy, java.awt.Component.FlipBufferStrategy

Field Summary

protected java.lang.Thread	bouncingThread The thread that keeps the ball bouncing
protected java.awt.Color	color The ball color
protected java.awt.Dimension	d Size of the viewing area
protected int	delay If no parameter passed then we set interval between two consecutive frames
protected int	dx The distance that ball passed during the move
protected int	dy The distance that ball passed during the move
protected java.awt.Image	image Off-screen image
protected java.awt.Graphics	offscreen Off-screen graphics
protected int	radius The ball radius
protected int	x The ball coordinates of current position
protected int	y The ball coordinates of current position

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

BouncingBall()

Method Summary

void	init() The initialization of the object
void	paint(java.awt.Graphics g) Paints the box and the ball
void	run() Contains inifinite loop and periodically calls repaint method
void	start() Activates the applet
void	stop() Deactivates the applet
void	update(java.awt.Graphics g) Representation of the ball movement

Methods inherited from class java.applet.Applet

destroy, getAccessibleContext, getAppletContext, getAppletInfo, getAudioClip, getAudioClip, getCodeBase, getDocumentBase, getImage, getImage, getLocale, getParameter, getParameterInfo, isActive, newAudioClip, play, play, resize, resize, setStub, showStatus

Methods inherited from class java.awt.Panel

addNotify

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getInsets, getLayout, getListeners, getMaximumSize, getMinimumSize, getMousePosition, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, paramString, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, removeNotify, setComponentZOrder, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, setLayout, transferFocusBackward, transferFocusDownCycle, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusUpCycle

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

color

protected java.awt.Color color

The ball color

See Also:

update(java.awt.Graphics)

radius

protected int radius

The ball radius

See Also:

init(), update(java.awt.Graphics)

x

protected int x

The ball coordinates of current position

See Also:

init(), update(java.awt.Graphics)

y

protected int y

The ball coordinates of current position

See Also:

init(), update(java.awt.Graphics)

dx

protected int dx

The distance that ball passed during the move

See Also:

update(java.awt.Graphics)

dy

protected int dy

The distance that ball passed during the move

See Also:

update(java.awt.Graphics)

image

protected java.awt.Image image

Off-screen image

See Also:

update(java.awt.Graphics)

offscreen

protected java.awt.Graphics offscreen

Off-screen graphics

See Also:

update(java.awt.Graphics)

d

protected java.awt.Dimension d

Size of the viewing area

See Also:

init(), update(java.awt.Graphics)

bouncingThread

protected java.lang.Thread bouncingThread

The thread that keeps the ball bouncing

See Also:

start(), stop(), run()

delay

protected int delay

If no parameter passed then we set interval between two consecutive frames

Constructor Detail

BouncingBall

public BouncingBall()

Method Detail

init

public void init()

The initialization of the object

Overrides:

init in class java.applet.Applet

update

public void update(java.awt.Graphics g)

Representation of the ball movement

Overrides:

update in class java.awt.Container

paint

public void paint(java.awt.Graphics g)

Paints the box and the ball

Overrides:

paint in class java.awt.Container

Parameters:

g - Graphics object to draw

See Also:

Graphics reference

start

public void start()

Activates the applet

Overrides:

start in class java.applet.Applet

stop

public void stop()

Deactivates the applet

Overrides:

stop in class java.applet.Applet

run

public void run()

Contains inifinite loop and periodically calls repaint method

Specified by:

run in interface java.lang.Runnable