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Two Command instances are created next These are the Exit command and the Process command The Exit command terminates the MIDlet, and the Process command causes the MIDlet to evaluate each check box to determine the user s preferences Once these Command instances are created, the MIDlet creates an instance of the Form class that will become the container that holds other instances The constructor of the Form class is passed the title of the form, called Movies The next series of statements associates the instance of the ChoiceGroup class and instances of the Command class with the form Notice that the entire instance referenced by movies is passed as a parameter to the append() method This automatically appends all the check boxes of the instance to the form You don t need to append each check box to the form The append() method returns the index number of the instance placed on the form As you learned previously in this chapter, the index number uniquely identifies an instance on the form and is used throughout the MIDlet to reference the instance The index number of the movies instance is stored in the movieIndex int so we can reference the movies instance later in the MIDlet You don t need to store the index number of an instance if the instance is not referenced within the MIDlet The MIDlet then associates commands and a CommandListener with the form and processes all user selections immediately when the Process command activates Alternatively, the MIDlet can implement an ItemStateChangeListener, which is notified whenever the state of an item changes Many developers prefer to use a CommandListener instead of an ItemStateChangeListener The instance of the Form object containing check boxes is displayed on the screen by calling the setCurrent() method from within the startApp() The setCurrent() method is passed reference to the instance of the form as a parameter The pauseApp() method and the destroyApp() method are defined as required by J2ME specifications but are left empty because the application doesn t require any special statements to be executed when the device s application manager calls both of these methods The actionCommand() method is where all the processing occurs The device s application manager detects when the user selects a command and notifies the MIDlet using the CommandListener to call the commandAction() method, where the command is evaluated The if statement within the commandAction() method compares the incoming command to the Process command If they match, the instance of the ChoiceGroup class is processed; otherwise the command is compared to the Exit command and terminates the MIDlet if they match The MIDlet performs some interesting processing when the user selects the Process command First, an array of boolean types is created Notice that the dimension of the array is set by calling the size() method of the instance of the ChoiceGroup The size() method returns the number of check boxes in the set The size() method is also used to create an array of instances of the StringItem object These instances are used to display the user s selections Next, the boolean array is passed to the getSelectedFlags() method The getSelectedFlags() method populates the boolean array with the state of each check. vb.net ean 13 reader .NET EAN - 13 Barcode Reader for C#, VB . NET , ASP.NET Applications
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NET EAN - 13 Barcode Reader , Reading EAN - 13 barcode images in .NET, C#, VB . NET , ASP.NET applications. Method static boolean isAbstract(int val) static boolean isFinal(int val) static boolean isInterface(int val) static boolean isNative(int val) static boolean isPrivate(int val) static boolean isProtected(int val) static boolean isPublic(int val) static boolean isStatic(int val) static boolean isStrict(int val) static boolean isSynchronized(int val) static boolean isTransient(int val) static boolean isVolatile(int val) Description Returns true if val has the abstract flag set and false otherwise Returns true if val has the final flag set and false otherwise Returns true if val has the interface flag set and false otherwise Returns true if val has the native flag set and false otherwise Returns true if val has the private flag set and false otherwise Returns true if val has the protected flag set and false otherwise Returns true if val has the public flag set and false otherwise Returns true if val has the static flag set and false otherwise Returns true if val has the strict flag set and false otherwise Returns true if val has the synchronized flag set and false otherwise Returns true if val has the transient flag set and false otherwise Returns true if val has the volatile flag set and false otherwise TABLE 27-5 vb.net ean 13 reader EAN - 13 VB . NET DLL - KeepAutomation.com
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