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This article mainly introduces the Java GUI programming menu components how to use the relevant knowledge, the content is detailed and easy to understand, simple and fast operation, has a certain reference value, I believe that we read this Java GUI programming menu components how to use the article will have a harvest, let's take a look at it.

Common menu-related components are given in the following table:

Menu component name function MenuBar menu bar, menu container. Menu menu component, a container for menu items. It is also a subclass of Menultem, so you can use the PopupMenu context menu component (right-click menu component) Menultem menu item component as a menu item. CheckboxMenuItem check box menu item component

The following is a diagram of the integration system of common menu-related components:

Menu-related components use:

1. Prepare menu item components, which can be MenuItem and its subclass objects

two。 Prepare the menu component Menu or PopupMenu (right-click the pop-up submenu) and add the menu item component prepared in the first step

3. Prepare the menu bar component MenuBar and add the menu component Menu prepared in step 2

4. Add the menu bar component prepared in step 3 to the window object for display.

Tips:

1. If you want to add a split line between the menu items of a menu, you only need to call Menu's add (new MenuItem (-)).

two。 If you want to associate a shortcut function with a menu item, you only need to set it when you create a menu item object. For example, if you associate a ctrl+shif+/ shortcut to a menu item, you only need: new MenuItem ("menu item name", new MenuShortcut (KeyEvent.VK_Q,true)).

Case 1:

Use the menu components commonly used in awt to complete the following effect

Demo code 1:

Import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;public class SimpleMenu {/ / create window private Frame frame = new Frame ("Test menu related components here"); / / create menu bar component private MenuBar menuBar = new MenuBar (); / / create file menu component private Menu fileMenu = new Menu ("File") / / create edit menu component private Menu editMenu = new Menu ("Edit"); / / create new menu item private MenuItem newItem = new MenuItem ("New"); / / create save menu item private MenuItem saveItem = new MenuItem ("Save"); / / create exit menu item private MenuItem exitItem = new MenuItem ("exit") / / create auto-wrap menu item private CheckboxMenuItem autoWrap = new CheckboxMenuItem ("auto-wrap"); / / create copy menu item private MenuItem copyItem = new MenuItem ("copy"); / / create paste menu item private MenuItem pasteItem = new MenuItem ("paste"); / / create format menu private Menu formatMenu = new Menu ("format") / / create comment menu item private MenuItem commentItem = new MenuItem ("comment"); / / create uncomment menu item private MenuItem cancelItem = new MenuItem ("uncomment"); / / create a text field private TextArea ta = new TextArea (6,40) Public void init () {/ / define menu event listeners ActionListener listener = new ActionListener () {@ Override public void actionPerformed (ActionEvent e) {String command = e.getActionCommand (); ta.append ("Click" + command+ "menu\ n") If (command.equals ("exit")) {System.exit (0);}; / / register listeners commentItem.addActionListener (listener) for comment menu items and exit menu items; exitItem.addActionListener (listener) / / add menu items fileMenu.add (newItem) to file menu fileMenu; fileMenu.add (saveItem); fileMenu.add (exitItem); / / add menu items editMenu.add (autoWrap) to edit menu editMenu; editMenu.add (copyItem); editMenu.add (pasteItem); / / add menu items formatMenu.add (commentItem) to format menu formatMenu FormatMenu.add (cancelItem); / / add the format menu to the edit menu as secondary menus editMenu.add (new MenuItem ("-")); editMenu.add (formatMenu); / / add the file menu and edit menu to the menu bar menuBar.add (fileMenu); menuBar.add (editMenu) / / set the menu bar to the frame window frame.setMenuBar (menuBar); / / add the text field to the frame frame.add (ta); / / set the best size of the frame and see frame.pack (); frame.setVisible (true);} public static void main (String [] args) {new SimpleMenu (). Init ();}}

Case 2:

Use PopupMenu to achieve the following effect:

The idea of realization is:

1. Create a PopubMenu menu component

two。 Create multiple MenuItem menu items and add them to PopupMenu

3. Add PopupMenu to the target component

4. To right-click the component where the PopubMenu menu appears, register the mouse listening event and pop up the menu when the user releases the right button.

Demo code 2:

Import java.awt.*;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;public class PopupMenuTest {private Frame frame = new Frame ("Test PopupMenu here"); / / create PopubMenu menu private PopupMenu popupMenu = new PopupMenu (); / / create menu bar private MenuItem commentItem = new MenuItem ("comment"); private MenuItem cancelItem = new MenuItem ("uncomment"); private MenuItem copyItem = new MenuItem ("copy") Private MenuItem pasteItem = new MenuItem ("Save"); / / create a text field private TextArea ta = new TextArea ("I love China!!" , 6,40); / / create a Panel private Panel panel = new Panel (); public void init () {/ / add menu items to PopupMenu popupMenu.add (commentItem); popupMenu.add (cancelItem); popupMenu.add (copyItem); popupMenu.add (pasteItem); / / set panel size panel.setPreferredSize (new Dimension (300,100)) / / add PopupMenu to panel panel.add (popupMenu); / / register the mouse event panel.addMouseListener (new MouseAdapter () {@ Override public void mouseReleased (MouseEvent e) {boolean flag = e.isPopupTrigger () for panel) / / determine whether the current mouse action triggers the PopupMenu operation if (flag) {/ / Let the PopupMenu display on the panel, and follow the mouse event to display the popupMenu.show (panel, e.getX (), e.getY ();}) / / add ta to the middle area of frame frame.add (ta); / / add panel to frame.add (panel, BorderLayout.SOUTH) at the bottom of frame; / / set the optimal size of frame and make it visible Frame.pack (); frame.setVisible (true);} public static void main (String [] args) {new PopupMenuTest (). Init ();}} this is the end of the article on "how to use Java GUI programming menu components". Thank you for reading! I believe that everyone has a certain understanding of the knowledge of "how to use Java GUI programming menu components". If you want to learn more, you are welcome to follow the industry information channel.

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