Core Java - [Java Menu]

♠ Posted by Unknown in Core Java at 11:10

Create Menu in Java

Menu makes selection easier, and are widely used in window applications. In Java, menus can only appear on a frame. Java provides three classes - MenBar, Menu, and MenuItem - to implements menus in frame.

A frame can hold a menu bar to which the pull-down menus are attached. Menu Consist of menu items that the user can select.

1. To create a Menu bar and associate it with frame.

Frame f = new Frame();

f.setsize(300,300);

f.setVisible(true);

MenuBar mb = new MenuBar();

f.setMenuBar(mb);

2. To Create Menus.

           

             public Menu(String label, boolean tearOff);

In above constructor the "true" tearOff enables the programmer to create a menu that desplays even when the mouse button is released.

            public Menu(String label);

This constructs a new menu instance with the specified label.

            Menu FileMenu = new Menu("File", true);

            mb.add(FileMenu);

3. To Create Menu items:

            FileMenu.add(new MenuItem("New");

            FileMenu.add(new MenuItem("Open");

            FileMenu.add(new MenuItem("-"); To add separator.

Example:

import java.awt.*;

import java.awt.event.*;

public class MyMenuExample extends Frame implements ActionListener

{

            MenuBar mb;

            Menu FileMenu, EditMenu;

           

            public MyMenuExample()

            {

                        mb = new MenuBar();

                        setMenuBar(mb);

                       

                        FileMenu = new Menu("File");

                        EditMenu = new Menu("Edit");

                       

                        mb.add(FileMenu);

                        mb.add(EditMenu);

                       

                        FileMenu.add(new MenuItem("New"));

                        FileMenu.add(new MenuItem("Save"));

                        FileMenu.add(new MenuItem("-"));

                       

                        MenuItem CloseMenuItem = new MenuItem("Close");

                        FileMenu.add(CloseMenuItem);

                        CloseMenuItem.addActionListener(this);

                       

                        EditMenu.add(new MenuItem("Copy"));

                        EditMenu.add(new MenuItem("Paste"));

                       

            }

            public void actionPerformed(ActionEvent ae)

            {

                        dispose();

                        System.exit(0);

            }

           

            public static void main(String[] args)

            {

                        MyMenuExample f = new MyMenuExample();

                        f.setVisible(true);

                        f.setSize(300, 300);

            }

}