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CHAPTER 14 Java Applets
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You compile a Java applet the same way you compile a Java application First, you write the Java applet source code using an editor and save it in a file that has an extension of java Next, you compile the source code using the Java compile, such as javac Demojava This produces the Java class (in this case, Democlass) that is made available to the HTML document that calls the Java applet
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You cannot directly run a Java applet from the Java environment as you do a Java application Java applets must be called from a document written in HTML HTML is called a markup language because it consists of standard tags that describe how text and images are to be displayed on the screen A browser interprets tags in an HTML document and displays text and images on the screen appropriately Many HTML tags consist of an opening tag and a closing tag The opening and closing tags tell the browser how to display everything that appears between these tags in the HTML document The name of a tag is contained within angle brackets, such as <applet>, which is the HTML tag used to tell the browser to load and run an applet The closing tag is identical except a forward slash is placed in front of the name, as in </applet> An HTML document must begin with the <html> tag and end with the </html> tag All other tags are placed within these two tags In order to run a Java applet, you must place the opening <applet> tag and the closing </applet> tag within the <html> and </html> tags The <applet> tag requires three attributes Think of an attribute as an argument to a method Each attribute must use the corresponding HTML attribute name followed by the assignment operator (=), and then a value Attributes are placed within the angle brackets following the name of the applet in the opening tag The first attribute is called code, and its value is the name of the Java applet enclosed within double quotations The second attribute is called width It defines the width of the window within which the Java applet appears on the screen Width is measured as an integer that represents the number of pixels that fit across the window The third attribute is called height, and it s an integer that identifies the number of pixels that fit between the top and bottom of the Java applet window The following example shows you an HTML document that loads and runs a Java applet The Java applet is called Democlass and runs in a window 300 pixels wide by 45 pixels high The Java applet window should not be larger than 800 pixels
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wide and 600 pixels high; otherwise, it may not fit on most computer screens An HTML document must be saved in a file that has the extension of either html or htm For example, you might save the following program in a file called demohtml:
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<html> <applet code="Democlass" width="300" height="45"> </applet> </html>
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In order to run the Java applet, you need to display the HTML document that contains the call to the Java applet Typically, the HTML document and the Java applet both reside on a web server that is connected to the Internet or to an intranet, which is commonly used on local networks in corporations The browser is usually located on a PC that is connected to the Internet or intranet You probably have experience displaying web pages A web page is an HTML document Therefore, you display the HTML document that calls your Java applet the same way in which you display a web page In the real world, programmers don t use a web server in the early stages of testing a Java applet Instead, they display the HTML document that calls the Java applet from an appletviewer, such as the appletviewer that comes with the Java 2 Platform Standard Edition In this way, programmers don t have to waste time copying the HTML document file and Java applet file to the web server each time they want to test a change Instead, they display the HTML document from their computer using the appletviewer Here s what you type to run the appletviewer Notice that you call the HTML document and not the Java applet This is because the HTML document calls the Java applet
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