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CHAPTER 14 Java Applets
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Writing a Java Applet
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Let s begin by easing your mind Although there are more than 200 methods in a Java applet, you only have to overwrite a few of them because the JApplet class s definitions of the other methods are adequate to handle most browser request In fact, many of these methods are empty, and others contain a minimum number of statements to respond to calls from the browser Your job is to overwrite selected methods in order to control how these methods react to requests made by the browser The five methods that most programmers overwrite in their Java applets are init(), start(), paint(), stop(), and destroy() You must overwrite the init(), start() and paint() methods The init() method is called when the browser begins the Java applet for the first time Typically, you ll place statements in this method that declare objects and initialize variables used in the Java applet The start() method is called whenever the browser restarts the Java applet after temporarily stopping it by calling the stop() method Let s say that a student is using your Java applet to register for a course, but temporarily opens an e-mail The browser calls the stop() method to stop the Java applet and then calls the start() method when the student again selects the open browser window on the desktop The paint() method is called whenever the browser needs to draw the screen The browser draws the screen the first time the Java applet runs and while the Java applet is running, if the screen needs to be refreshed (such as when the student moves the browser window on the desktop) The destroy() method is called immediately before the termination of the Java applet
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Structure of a Java Applet
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A Java applet looks very similar to a Java application because both have an application class However, a Java applet must extend the JApplet class, which is not the case with a Java application The JApplet class is contained in the javaxswing package
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The following example is a Java applet You might think that something is missing because the body of the class is empty Although it is true that the class is empty, the JApplet class contains the definitions of the 200+ methods that might be called by the browser
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import javaxswingJApplet; public class Demo extends JApplet { }
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Now let s customize this Java applet by overwriting the JApplet class s paint() method to display Hello word! onscreen The paint() method requires one argument, which is a reference to a Graphics object The Graphics object is used to call methods of the Graphics class that enable you to, among other things, display text and lines on the screen The method receives reference to a Graphics object when the browser calls the paint() method We ll place one statement within the paint() method, which is called the drawString() method The drawString() method displays a string of characters on the screen You ll need to pass the drawString() method three arguments The first augment is the string that is to be displayed on the screen The other two arguments are screen coordinates that specify where the string is to be placed on the screen The second argument is called the x coordinate and the third argument is called the y coordinate The screen is referred to as the Java applet window and is divided into columns and rows Where a column and row meet is called a picture element (or pixel) An x, y coordinate identifies each pixel The x coordinate (x-axis) represents the column number, and the y coordinate (y-axis) represents the row number This is similar in concept to a cell of a spreadsheet The pixel in the upper-leftmost corner of the Java applet window has the coordinate 0,0 The maximum coordinate depends on the size of the Java applet window and the resolution of the computer monitor used to display the Java applet Many com puters have a resolution that is 800 pixels wide (columns) and 600 pixels high (rows) The following example illustrates how to write a Hello word! Java applet Notice that we place the text at coordinate 15, 15
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import javaxswingJApplet; public class Demo extends JApplet { public void paint(Graphics g){ gdrawString("Hello world!", 15,15); } }
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