Associating Names with Components ONE CAN INSTRUCT JAVA TO ASSOCIATE A NAME WITH A COMPONENT BY USING AN ASSIGNMENT STATEMENT IN A METHOD: public void begin() { horizControl = new Slider( 50, 0, 199); vertControl = new Slider( 50, 0, 199); ... } ("begin" IS A METHOD WHOSE INSTRUCTIONS WILL BE FOLLOWED WHEN AN APPLET FIRST BEGINS WORKING -- i.e. WHEN THE PAGE IT IS ON IS VISITED)

The Web: Technologies and Techniques Links to other course pages: CS 105 Home Page CS 105 Lecture Schedule CS 105 On-line Discussion Group: All discussions Discussion relating to this lecture topic Williams College Department of Computer Science

This page is part of a section of lecture slides related to " Variables " within the topic "Java -- Executable Web Content". Other slides within this section and other sections of slides for the topic "Java -- Executable Web Content" can be accessed using the links below. Limitations of the Client/Server Model THE CLIENT/SERVER MODEL LIMITS THE WEB FORMS PROVIDE LIMITED INTERACTIVITY How Applets Fit ACTIVE DOCUMENTS JAVA Applet Structure APPLET STRUCTURE METHOD STRUCTURE METHOD PARAMETERS Event Handling THE "EVENT" INTERFACE Basics of Java Graphics IDENTIFYING PIXELS THE "Pen" INTERFACE GRAPHIC PRIMITIVES DRAWING TEXT OPTIONAL PARAMETERS LINE DRAWING Shape Drawing Methods SHAPE DRAWING SHAPE DRAWING (cont.) CLEAR METHODS DRAWING + CLEARING = INVERSION Specifying Colors User Interface Components User Interface Components Component Constructors The Slider Constructor Method The Slider Constructor Method (cont.) Variables Naming Components Instance Variable Names Associating Names with Components Component Layout Management Adding Components to the Display The Layout Manager Event Handlers for Components Component Event Handlers THE scroll METHOD COMPONENT ACCESS METHODS THE SLIDER getValue METHOD More on Methods PUBLIC VS. PRIVATE PRIVATE METHODS VOID vs. NON-VOID METHODS FUNCTIONS