AWT Components (Chapter 9) Java Certification Study Group January 21, 1999 Mark Roth.

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Presentation transcript:

AWT Components (Chapter 9) Java Certification Study Group January 21, 1999 Mark Roth

Components java.awt.Component –“A component is an object having a graphical representation that can be displayed on the screen and that can interact with the user.” - Javadoc java.awt.MenuComponent –“The abstract class MenuComponent is the superclass of all menu-related components.” - Javadoc

java.awt.Compoennt Dimension getSize() void setForeground( java.awt.Color ) void setBackground( java.awt.Color ) setFont( java.awt.Font ) setEnabled( boolean ) setSize( width, height ) These Only Work Well for Frames: –setBounds( Rectangle ) or (x, y, w, h) –setVisible( boolean )

Component Categories (11) Visual Components (4) Container Components (4) Menu Components

Visual Components “…the ones that users can actually see and interact with.” - S. Roberts To Use: –Create a new instance –Add component to a container

Constructing Visual Components Button( String label ) --> ActionEvent Canvas() --> MouseEvent, MouseMotionEvent, KeyEvent Checkbox( String label, boolean initialState ) --> ItemEvent Choice() --> ItemEvent FileDialog( Frame parent, String title, int mode ) Label( String text, int alignment )

Constructing Visual Components List( int nVisibleRows, boolean multiSelectOk ) --> ItemEvent, ActionEvent ScrollPane( int scrollbarPolicy ) --> MouseEvent, MouseMotionEvent Scrollbar( int orientation, int initialValue, int sliderSize, int minValue, int maxValue ) --> AdjustmentEvent

Constructing Visual TextComponents TextField( String text, int nCols ) TextArea( String text, int nRows, int nCols, int scrollbarPolicy ) Events –TextEvent (both, when text is typed) –ActionEvent (Enter in TextField)

Constructing Container Components Applet() Frame( String title ) Panel() Dialog()

Menu Components Creation –Create a menu bar and attach it to the frame. –Create and populate the menu. –Attach the menu to the menu bar. Populating the Menu –Menu items –Check-box menu items –Separators –Menus

MenuItem( text ) --> ActionEvent CheckBoxMenuItem() --> ItemEvent menu.addSeparator() setHelpMenu() Menu

References All Material in this Presentation is heavily based on: Roberts, Simon and Heller, Philip, Java 1.1 Certification Study Guide, 1997: SYBEX™. ISBN: Selected portions from JDK JavaDoc HTML pages.