visual basic 2010 barcode generator Tip On your own, try defining dialog boxes for the other options presented by the menus in Java

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Tip On your own, try defining dialog boxes for the other options presented by the menus
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FileDialog
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Java provides a built-in dialog box that lets the user specify a file To create a file dialog box, instantiate an object of type FileDialog This causes a file dialog box to be displayed Usually, this is the standard file dialog box provided by the operating system FileDialog provides these constructors: FileDialog(Frame parent, String boxName) FileDialog(Frame parent, String boxName, int how) FileDialog(Frame parent) Here, parent is the owner of the dialog box, and boxName is the name displayed in the box's title bar If boxName is omitted, the title of the dialog box is empty If how is FileDialogLOAD, then the box is selecting a file for reading If how is FileDialogSAVE, the box is selecting a file for writing The third constructor creates a dialog box for selecting a file for reading FileDialog( ) provides methods that allow you to determine the name of the file and its path as selected by the user Here are two examples: String getDirectory( ) String getFile( ) These methods return the directory and the filename, respectively The following program activates the standard file dialog box: /* Demonstrate File Dialog box This is an application, not an applet */ import javaawt*; import javaawtevent*; // Create a subclass of Frame class SampleFrame extends Frame { SampleFrame(String title) { super(title); // create an object to handle window events MyWindowAdapter adapter = new MyWindowAdapter(this); // register it to receive those events addWindowListener(adapter); } } class MyWindowAdapter extends WindowAdapter {
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SampleFrame sampleFrame; public MyWindowAdapter(SampleFrame sampleFrame) { thissampleFrame = sampleFrame; } public void windowClosing(WindowEvent we) { sampleFramesetVisible(false); }
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// Create frame window class FileDialogDemo { public static void main(String args[]) { Frame f = new SampleFrame("File Dialog Demo"); fsetVisible(true); fsetSize(100, 100); FileDialog fd = new FileDialog(f, "File Dialog"); fdsetVisible(true);
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Handling Events by Extending AWT Components
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Before concluding our look at the AWT, one more topic needs to be discussed: handling events by extending AWT components The delegation event model was introduced in 20, and all of the programs in this book so far have used that design But Java also allows you to handle events by subclassing AWT components Doing so allows you to handle events in much the same way as they were handled under the original 10 version of Java Of course, this technique is discouraged, because it has the same disadvantages of the Java 10 event model, the main one being inefficiency Handling events by extending AWT components is described in this section for completeness However, this technique is not used in any other sections of this book To extend an AWT component, you must call the enableEvents( ) method of Component Its general form is shown here: protected final void enableEvents(long eventMask) The eventMask argument is a bit mask that defines the events to be delivered to this component The AWTEvent class defines the int constants shown here for making this mask: ACTION_EVENT_MASK ADJUSTMENT_EVENT_MASK COMPONENT_EVENT_MASK ITEM_EVENT_MASK KEY_EVENT_MASK MOUSE_EVENT_MASK
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CONTAINER_EVENT_MASK FOCUS_EVENT_MASK
MOUSE_MOTION_EVENT_MASK TEXT_EVENT_MASK
INPUT_METHOD_EVENT_MASK WINDOW_EVENT_MASK You must also override the appropriate method from one of your superclasses in order to process the event Table 22-1 lists the methods most commonly used and the classes that provide them The following sections provide simple programs that show how to extend several AWT components Table 22-1 Event Processing Methods
Class
Processing Methods
Button Checkbox
processActionEvent( ) processItemEvent( )
CheckboxMenuItem processItemEvent( ) Choice Component processItemEvent( ) processComponentEvent( ), processFocusEvent( ), processKeyEvent( ), processMouseEvent( ), processMouseMotionEvent( ) processActionEvent( ), processItemEvent( ) processActionEvent( ) processAdjustmentEvent( ) processTextEvent( )
List MenuItem Scrollbar TextComponent
Extending Button
The following program creates an applet that displays a button labeled "Test Button" When the button is pressed, the string "action event: " is displayed on the status line of the applet viewer or browser, followed by a count of the number of button presses The program has one top-level class named ButtonDemo2 that extends Applet A static integer variable named i is defined and initialized to zero This records the number of button pushes The init( ) method instantiates MyButton and adds it to the applet MyButton is an inner class that extends Button Its constructor uses super to pass the
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label of the button to the superclass constructor It calls enableEvents( ) so that action events may be received by this object When an action event is generated, processActionEvent( ) is called That method displays a string on the status line and calls processActionEvent( ) for the superclass Because MyButton is an inner class, it has direct access to the showStatus( ) method of ButtonDemo2 /* * <applet code=ButtonDemo2 width=200 height=100> * </applet> */ import javaawt*; import javaawtevent*; import javaapplet*; public class ButtonDemo2 extends Applet { MyButton myButton; static int i = 0; public void init() { myButton = new MyButton("Test Button"); add(myButton); } class MyButton extends Button { public MyButton(String label) { super(label); enableEvents(AWTEventACTION_EVENT_MASK); } protected void processActionEvent(ActionEvent ae) { showStatus("action event: " + i++); superprocessActionEvent(ae); } } }
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