Introduction
The Menu class represents pull-down menu component which is deployed from a menu bar.
Class declaration
Following is the declaration for java.awt.Menu class:
public class Menu
extends MenuItem
implements MenuContainer, Accessible
Class constructors
| S.N. | Constructor & Description |
|---|---|
| 1 | Menu()Constructs a new menu with an empty label. |
| 2 | Menu(String label)Constructs a new menu with the specified label. |
| 3 | Menu(String label, boolean tearOff)Constructs a new menu with the specified label, indicating whether the menu can be torn off. |
Class methods
| S.N. | Method & Description |
|---|---|
| 1 | MenuItem add(MenuItem mi)Adds the specified menu item to this menu. |
| 2 | void add(String label)Adds an item with the specified label to this menu. |
| 3 | void addNotify()Creates the menu’s peer. |
| 4 | void addSeparator()Adds a separator line, or a hypen, to the menu at the current position. |
| 5 | int countItems()Deprecated. As of JDK version 1.1, replaced by getItemCount(). |
| 6 | AccessibleContext getAccessibleContext()Gets the AccessibleContext associated with this Menu. |
| 7 | MenuItem getItem(int index)Gets the item located at the specified index of this menu. |
| 8 | int getItemCount()Get the number of items in this menu. |
| 9 | void insert(MenuItem menuitem, int index)Inserts a menu item into this menu at the specified position. |
| 10 | void insert(String label, int index)Inserts a menu item with the specified label into this menu at the specified position. |
| 11 | void insertSeparator(int index)Inserts a separator at the specified position. |
| 12 | boolean isTearOff()Indicates whether this menu is a tear-off menu. |
| 13 | String paramString()Returns a string representing the state of this Menu. |
| 14 | void remove(int index)Removes the menu item at the specified index from this menu. |
| 15 | void remove(MenuComponent item)Removes the specified menu item from this menu. |
| 16 | void removeAll()Removes all items from this menu. |
| 17 | void removeNotify()Removes the menu’s peer. |
Methods inherited
This class inherits methods from the following classes:
- java.awt.MenuItem
- java.awt.MenuComponent
- java.lang.Object
Menu Example
Create the following java program using any editor of your choice in say D:/ > AWT > com > adglob> gui >AWTMenuDemo.java
package com.adglob.gui;
import java.awt.*;
import java.awt.event.*;
public class AWTMenuDemo {
private Frame mainFrame;
private Label headerLabel;
private Label statusLabel;
private Panel controlPanel;
public AWTMenuDemo(){
prepareGUI();
}
public static void main(String[] args){
AWTMenuDemo awtMenuDemo = new AWTMenuDemo();
awtMenuDemo.showMenuDemo();
}
private void prepareGUI(){
mainFrame = new Frame("Java AWT Examples");
mainFrame.setSize(400,400);
mainFrame.setLayout(new GridLayout(3, 1));
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent){
System.exit(0);
}
});
headerLabel = new Label();
headerLabel.setAlignment(Label.CENTER);
statusLabel = new Label();
statusLabel.setAlignment(Label.CENTER);
statusLabel.setSize(350,100);
controlPanel = new Panel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
private void showMenuDemo(){
//create a menu bar
final MenuBar menuBar = new MenuBar();
//create menus
Menu fileMenu = new Menu("File");
Menu editMenu = new Menu("Edit");
final Menu aboutMenu = new Menu("About");
//create menu items
MenuItem newMenuItem =
new MenuItem("New",new MenuShortcut(KeyEvent.VK_N));
newMenuItem.setActionCommand("New");
MenuItem openMenuItem = new MenuItem("Open");
openMenuItem.setActionCommand("Open");
MenuItem saveMenuItem = new MenuItem("Save");
saveMenuItem.setActionCommand("Save");
MenuItem exitMenuItem = new MenuItem("Exit");
exitMenuItem.setActionCommand("Exit");
MenuItem cutMenuItem = new MenuItem("Cut");
cutMenuItem.setActionCommand("Cut");
MenuItem copyMenuItem = new MenuItem("Copy");
copyMenuItem.setActionCommand("Copy");
MenuItem pasteMenuItem = new MenuItem("Paste");
pasteMenuItem.setActionCommand("Paste");
MenuItemListener menuItemListener = new MenuItemListener();
newMenuItem.addActionListener(menuItemListener);
openMenuItem.addActionListener(menuItemListener);
saveMenuItem.addActionListener(menuItemListener);
exitMenuItem.addActionListener(menuItemListener);
cutMenuItem.addActionListener(menuItemListener);
copyMenuItem.addActionListener(menuItemListener);
pasteMenuItem.addActionListener(menuItemListener);
final CheckboxMenuItem showWindowMenu =
new CheckboxMenuItem("Show About", true);
showWindowMenu.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
if(showWindowMenu.getState()){
menuBar.add(aboutMenu);
}else{
menuBar.remove(aboutMenu);
}
}
});
//add menu items to menus
fileMenu.add(newMenuItem);
fileMenu.add(openMenuItem);
fileMenu.add(saveMenuItem);
fileMenu.addSeparator();
fileMenu.add(showWindowMenu);
fileMenu.addSeparator();
fileMenu.add(exitMenuItem);
editMenu.add(cutMenuItem);
editMenu.add(copyMenuItem);
editMenu.add(pasteMenuItem);
//add menu to menubar
menuBar.add(fileMenu);
menuBar.add(editMenu);
menuBar.add(aboutMenu);
//add menubar to the frame
mainFrame.setMenuBar(menuBar);
mainFrame.setVisible(true);
}
class MenuItemListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
statusLabel.setText(e.getActionCommand()
+ " MenuItem clicked.");
}
}
}
Compile the program using the command prompt. Go to D:/ > AWT and type the following command.
D:\AWT>javac com\adglob\gui\AWTMenuDemo.java
If no error comes that means compilation is successful. Run the program using following command.
D:\AWT>java com.adglob.gui.AWTMenuDemo
Verify the following output. (Click on File Menu.)
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