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The MIDlet in Listing 6-2 is called DisplayAlert and begins by declaring references to instances of the Display class, Alert object, Form object, and Command object There is also a boolean variable, which is used to flag whether or not the user made one attempt to terminate the MIDlet Next, the constructor is defined, first by assigning a false value to the exitFlag variable The false value is the default value and indicates that the person hasn t made the first attempt to exit the MIDlet Three instances are then created and assigned to the appropriate reference These are instances of the Display class, Command class, and Form class The instance of the Command class is associated with the instance of the Form class by calling the addCommand() method and passing it reference to the instances of the Command class The last statement in the constructor associates a CommandListener to the instance of the Form class by invoking the setCommandListener() method The registered CommandListener is notified of command events as they occur The startApp() method is then defined with one statement that calls the setCurrent() method to display the instance of the Form class on the screen The startApp() method is invoked by the device s application manager The pauseApp() is defined as an empty method Remember that every MIDlet must have a pauseApp() defined, even if no statements are executed when the application manager calls the pauseApp() method The destroyApp() method also must be defined in every MIDlet and is the method called before the MIDlet terminates The destroyApp() method is passed a boolean value that indicates whether termination of the MIDlet is conditional or unconditional Conditional termination requires that a particular condition be met prior to termination The condition in this example is that the value of the boolean parameter is false, indicating that the MIDlet hasn t finished processing, although the user requested that the MIDlet terminate An exception is thrown when this occurs An unconditional termination indicates that no condition must be met before the MIDlet terminates, which happens in this example when the user selects the Exit command for the second time The commandAction() method processes command events trapped by the CommandListener The commandAction() is called when the person selects any command available on the device The CommandListener s commandAction() method processes command events as notified by the system/application manager Only the Exit command is evaluated in this example The MIDlet flow enters the try { } block when the Exit command is received by the commandAction() method, and the MIDlet evaluates whether or not the value of the exitFlag variable is false If false, this means that the user has selected the Exit command only once This causes the creation of an instance of the Alert class, which is assigned to the appropriate reference The title of the alert instance is Busy, and the message is Please try again No image is being used with the alert instance; therefore the third parameter is null The AlertType of the alert instance is WARNING The alert dialog box is modal, so the timeout setting must be set to AlertFOREVER This is accomplished by calling the setTimeout() method and passing it the AlertFOREVER integer.

In addition, you can specify any item to be already selected when the page is loaded by adding the selected attribute to that item s opening option tag Users can select a different menu item if they choose

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2 Set default value for the exit flag to false 3 Obtain a reference to the instance of the Display class 4 Create an instance of a Command class to exit the MIDlet 5 Create an instance of the Form class 6 Associate the instance of the Command class to the instance of the Form class 7 Associate a CommandListener with the instance of the Form class 8 Display the instance of the Form class on the screen 9 Evaluate the command selected by the user 10 If the Exit command is selected, determine whether conditions are safe to terminate the MIDlet 11 If conditions are not safe to terminate the MIDlet, create a modal instance of the Alert class with the message Busy Please try again 12 Display the instance of the Alert class on the screen 13 Call the destroyApp() method with a conditional termination notice 14 If conditions are safe to terminate the MIDlet, call the destroyApp() method with an unconditional termination notice, and notify the application manager of pending termination of the MIDlet 15 When the destroyApp() method is called, evaluate the status of the unconditional parameter 16 If the unconditional parameter is false, throw a MIDletStateChangeException; otherwise, terminate the MIDlet 17 Trap exceptions thrown within the commandAction() method 18 If the MIDletStateChangeException is thrown, indicate that conditions are now safe to terminate the MIDlet by assigning a true value to the exit flag variable 19 Terminate the MIDlet when the Exit command is entered the second time

Figure 11-3

Next, the destroyApp() method is called and is passed a false, indicating there is a condition associated with the termination of the MIDlet That is, the user must make two attempts to terminate the MIDlet, and only one attempt has been made so far

Don t specify more than one item as selected, unless you also let users choose more than one option by adding the multiple attribute to the select tag <option value="red" selected="selected">red</option>

ICMP Group Membership messages are used to convey information about multicast group membership from nodes to their neighboring routers (connected on the same link) Their format is illustrated in Figure 5-7 The IPv6 destination address values change in function for the different types of messages: In a Group Membership Query message, the destination address is equal to the multicast address of the group being queried or equal to the link local All-Nodes (FF02::1, see Section 481) multicast address In a Group Membership Report or Group Membership Reduction message, the destination address is equal to the multicast address of the group being reported or terminated

6:

The optgroup element is used to divide long menus into categories of submenus The label attribute is employed along with the optgroup element to give the submenu a name The following is an example of how to create submenus with optgroup tags, followed by a visual representation of how one browser displays them

However, the destroyApp() method is invoked and passed a boolean true if the value of the exitFlag variable is true, which begins the termination process The MIDlet then returns from the destroyApp() to call the notifyDestroyed() method, which notifies the application manager of the termination The catch { } traps a MIDletStateChangeException thrown by the destroyApp() when a conditional termination notice is received The exception causes the value of the exitFlag variable to be set to true, meaning the MIDlet terminates unconditionally the next time the user selects the Exit command

<form> Please choose the time and day that is best to reach you <select name="TimeDay"> <optgroup label="Monday"> <option value="Monday AM">Monday AM</option> <option value="Monday PM">Monday PM</option> </optgroup> <optgroup label="Tuesday"> <option value="Tuesday AM">Tuesday AM</option> <option value="Tuesday PM">Tuesday PM</option> </optgroup> </select> </form>

Listing 6-1 The JAD file for Listing 6-2

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