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CHAPTER 14 Java Applets
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Practically all the techniques you learned to use when writing a Java application can also be used to write an applet One of those features is a professional-looking user interface for your applet that includes dialog boxes, push buttons, text boxes, and all the other niceties that we ve come to expect from a computer program You learned how to create a graphical user interface (GUI) for your program in the previous chapter You can use many of those techniques to create a user interface for your applet The quickest way to incorporate a GUI in an applet is to use a message dialog box and an input dialog box As you ll recall from the previous chapter, a message dialog box is a GUI display that presents the user with a message and an OK button An input dialog box presents the user with a message, a text box used to enter information, and an OK button Information entered into the input dialog box becomes available for use by your applet You create both of these dialog boxes by using a method defined in the JOptionPane class, which is contained in the javaxswing package A number of very useful methods are defined in the JOptionPane class; however, we re interested in only two of them: showMessageDialog() and showInputDialog() The showMessageDialog() method displays a message dialog box This method requires four arguments The first argument is a reference to its parent dialog box Typically, there isn t a parent, so you ll pass it a null The second argument is a string that contains the message that will be displayed in the dialog box The third argument is also a string It s used as the caption for the dialog box The last argument is a static variable indicating the kind of message dialog box you want displayed We ll use PLAIN_MESSAGE for our purposes The other kinds of message dialog boxes are mentioned in the previous chapter Here is the way you call the showMessageDialog() method:
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JOptionPaneshowMessageDialog(null, "Message" , "Caption", JOptionPanePLAIN_MESSAGE);
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The showInputDialog() method is used to display an input dialog box and requires one argument a string containing the message that tells the user to enter information into the dialog box After the user selects OK, the showInputDialog() method returns the information entered by the user as a string You can then process the string within your applet Here s how you call the showInputDialog() method In this case, value is a string variable that was previously declared somewhere in the program that executes this statement
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value = JOptionPaneshowInputDialog ("Message");
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The following example shows how both dialog boxes are used in an applet This example calculates a grade First, the user is asked to enter the total number of questions on the test (see Figure 14-1) Next, the user is asked to enter the number of correct answers (see Figure 14-2) The applet then calculates the grade and displays the grade in a message box (see Figure 14-3) The HTML document used to run this applet is shown at the end of the example
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import javaawtGraphics; import javaxswing*; public class Demo extends JApplet { double doubleGrade; public void init() { String totalNumberQuestions; String totalCorrectAnswers; double doubleNumberQuestions; double doubleCorrectAnswers; totalNumberQuestions = JOptionPaneshowInputDialog ( "Enter the total number of test questions"); totalCorrectAnswers = JOptionPaneshowInputDialog ( "Enter the total number of correct answers"); doubleNumberQuestions = DoubleparseDouble( totalNumberQuestions); doubleCorrectAnswers = DoubleparseDouble( totalCorrectAnswers); doubleGrade = ( doubleCorrectAnswers/doubleNumberQuestions) * 100; } public void paint (Graphics g) { JOptionPaneshowMessageDialog(null, "Your grade is " + doubleGrade + "%", "Grade", JOptionPanePLAIN_MESSAGE); } } <html> <applet code="Democlass" width="400" height="75"> </applet> </html>
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