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Here is a program that creates a simple menu bar that contains three menus The first is a standard File menu that contains Open, Close, Save, and Exit selections The second menu is called Options and it contains two submenus called Language and Target The third menu is called Help and it has one item: About When a menu item is selected, the name of the selection is displayed in a label in the content pane
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// Create a main menu import javaawt*; import javaawtevent*; import javaxswing*; class MakeMainMenu implements ActionListener { JLabel jlab; MakeMainMenu() { // Create a new JFrame container JFrame jfrm = new JFrame("Menu Demo"); // Specify FlowLayout for the layout manager jfrmsetLayout(new FlowLayout()); // Give the frame an initial size jfrmsetSize(220, 200); // Terminate the program when the user closes the application jfrmsetDefaultCloseOperation(JFrameEXIT_ON_CLOSE); // Create a label that will display the menu selection jlab = new JLabel(); // Create the menu bar JMenuBar jmb = new JMenuBar(); // Create the File menu JMenu jmFile = new JMenu("File"); JMenuItem jmiOpen = new JMenuItem("Open"); JMenuItem jmiClose = new JMenuItem("Close"); JMenuItem jmiSave = new JMenuItem("Save"); JMenuItem jmiExit = new JMenuItem("Exit"); jmFileadd(jmiOpen); jmFileadd(jmiClose); jmFileadd(jmiSave); jmFileaddSeparator(); jmFileadd(jmiExit); jmbadd(jmFile); // Create the Options menu JMenu jmOptions = new JMenu("Options");
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// Create the Language submenu JMenu jmLanguage = new JMenu("Language"); JMenuItem jmiJava = new JMenuItem("Java"); JMenuItem jmiCpp = new JMenuItem("C++"); JMenuItem jmiCsharp = new JMenuItem("C#"); jmLanguageadd(jmiJava); jmLanguageadd(jmiCpp); jmLanguageadd(jmiCsharp); jmOptionsadd(jmLanguage); // Create the Target submenu JMenu jmTarget = new JMenu("Target"); JMenuItem jmiDebug = new JMenuItem("Debugging"); JMenuItem jmiDeploy = new JMenuItem("Deployment"); jmTargetadd(jmiDebug); jmTargetadd(jmiDeploy); jmOptionsadd(jmTarget); // Finally, add the entire Options menu to the menu bar jmbadd(jmOptions); // Create the Help menu JMenu jmHelp = new JMenu("Help"); JMenuItem jmiAbout = new JMenuItem("About"); jmHelpadd(jmiAbout); jmbadd(jmHelp); // Add action listeners for the menu items // Use one handler for all menu events jmiOpenaddActionListener(this); jmiCloseaddActionListener(this); jmiSaveaddActionListener(this); jmiExitaddActionListener(this); jmiJavaaddActionListener(this); jmiCppaddActionListener(this); jmiCsharpaddActionListener(this); jmiDebugaddActionListener(this); jmiDeployaddActionListener(this); jmiAboutaddActionListener(this); // Add the label to the content pane jfrmadd(jlab); // Add the menu bar to the frame jfrmsetJMenuBar(jmb); // Display the frame jfrmsetVisible(true); } // Handle menu item action events public void actionPerformed(ActionEvent ae) {
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// Get the action command from the menu selection String comStr = aegetActionCommand(); // If user chooses Exit, then exit the program if(comStrequals("Exit")) Systemexit(0); // Otherwise, display the selection jlabsetText(comStr + " Selected"); } public static void main(String args[]) { // Create the frame on the event dispatching thread SwingUtilitiesinvokeLater(new Runnable() { public void run() { new MakeMainMenu(); } }); } }
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Options and Alternatives
As stated at the start of this recipe, the subject of menus is very large They support many options, have many variations, and offer many opportunities for customization It is far beyond the scope of this recipe to discuss them all However, a few of the more commonly used options are mentioned here In addition to standard menu items, you can also include check boxes and radio buttons in a menu A check box menu item is created by JCheckBoxMenuItem A radio button menu item is created by JRadioButtonMenuItem Both of these classes extend JMenuItem JToolBar creates a stand-alone component that is related to the menu It is often used to provide fast access to functionality contained within the menus of the application For example, a tool bar might provide fast access to the formatting commands supported by a word processor As described earlier, by default when you add a JMenuItem to a JMenu, it is added to the end of the menu However, by using the following version of add( ) you can add a menu item to a menu at a specific location: Component add(Component menuItem, int idx)
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