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Here, menuItem is added at the index specified by idx Indexing begins at 0 For example, in the preceding program, the following statement makes Deployment the first entry in the Target menu:
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Although menuItem is declared as a Component, you will typically add JMenuItems to a menu (This version of add( ) is inherited from Component As mentioned at the start of this chapter, all Swing components inherit JComponent, which inherits Component) In some cases you might want to remove a menu item that is no longer needed You can do this by calling remove( ) on the JMenu instance It has these two forms: void remove(JMenuItem menuItem) void remove(int idx) Here, menuItem is a reference to the menu item to remove and idx is the index of the menu to remove Indexing begins at 0 JMenuBar also supports versions of add( ) and remove( ) that let you add a JMenu object to the bar at a specific index or remove an instance of JMenu from the bar Sometimes it is useful to know how many items are in the menu bar To obtain a count of the items in the main menu bar, call getMenuCount( ) on the JMenuBar instance It is shown here: int getMenuCount( ) It returns the number of elements contained within the menu bar You can determine how many items are in a JMenu by calling getMenuComponentCount( ), shown here: int getMenuComponentCount( ) The count is returned You can retrieve an array of the items in the menu by calling getMenuComponents( ) on the JMenu instance It is shown next: Component[ ] getMenuComponents( ) An array containing the components is returned Because menu items inherit AbstractButton, you have access to the functionality provided by AbstractButton For example, you can enable/disable a menu item by calling setEnabled( ), shown here: void setEnabled(boolean enable) If enable is true, the menu item is enabled If enable is false, the item is disabled and cannot be selected The main menu is not the only kind of menu that you can create You can also create stand-alone, popup menus These are menus that do not descend from a menu bar Rather, they are activated independently, usually by right-clicking the mouse Popup menus are instances of JPopupMenu
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ne of the problems with writing a programming cookbook is finding an appropriate stopping point There is a nearly unlimited universe of topics to choose from, any number of which could merit inclusion It s difficult to find where to draw the line Of course, all books must end Thus, a stopping point, whether easily found or not, is always required This book is, of course, no exception In this, the final chapter of the book, I have chosen to conclude with an assortment of recipes that span a variety of topics These recipes represent techniques that I wanted covered in the book, but for which a complete chapter was, for one reason or another, not possible The recipes do, however, meet the requirements that I set forth when I began this book: they answer a frequently asked question and are applicable to a wide range of programmers Furthermore, they all describe key concepts that you can easily adapt and enhance Here are the recipes contained in this chapter: Access a Resource via an HTTP Connection Use a Semaphore Return a Value from a Thread Use Reflection to Obtain Information about a Class at Runtime Use Reflection to Dynamically Create an Object and Call Methods Create a Custom Exception Class Schedule a Task for Future Execution
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Classes javanetHttpURLConnection Methods String getRequestMethod( ) int getResponseCode( ) String getResponseMessage( ) URLConnection openConnection( ) int getContentLength( ) String getContentType( ) long getDate( ) long getExpiration( ) Map<String, List<String>> getHeaderFields( ) long getLastModified( ) InputStream getInputStream( )
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