Home Java Example Java Awt Menus

Menus
Posted on: December 18, 2008 at 12:00 AM

We can also develop an application with a Menu. As a name indicates a Menu consists of Menu objects.

Menus

We can also develop an application with a Menu. As a name indicates a Menu consists of Menu objects. These Menu objects comprise of MenuItem objects which can be selected by the user with a click of a mouse. A MenuItem may be a String, checkbox, separator, menu etc.

Following are the steps to to add menus to any Frame:

You need to create a MenuBar first with the help of the following method.

MenuBar mb = new MenuBar();

2. Then you need to create a Menu using Menu m = new Menu("File");.

3. Now the MenuItem options can be added to the Menu from top to bottom, using the following methods.

mi.add(new MenuItem("Open"));
mi.add(new CheckboxMenuItem("Type here"));

4. Now you can add the Menu to the MenuBar from left to right using mi.add(m);.

5. Finally, you need to add the MenuBar to the Frame by calling the setMenuBar() method.

The program code given below, creates an application window with a menu bar.


import java.awt.*; 

import java.awt.event.*; 

 

public class MainWindow extends Frame { 

  public MainWindow() { 

  super("Menu Window"); 

  setSize(400, 400); 

  FileMenu fileMenu = new FileMenu(this); 

  HelpMenu helpMenu = new HelpMenu(this); 

  MenuBar mb = new MenuBar(); 

  mb.add(fileMenu); 

  mb.add(helpMenu); 

  setMenuBar(mb); 

  addWindowListener(new WindowAdapter() { 

  public void windowClosing(WindowEvent e) { 

  exit(); 

  } 

  }); 

  } 

 

  public void exit() { 

  setVisible(false); 

  dispose(); 

  System.exit(0); 

  } 

 

  public static void main(String args[]) { 

  MainWindow w = new MainWindow(); 

  w.setVisible(true); 

  } 

} 

 

class FileMenu extends Menu implements ActionListener { 

  MainWindow mw;  

  public FileMenu(MainWindow m) { 

  super("File"); 

  mw = m; 

  MenuItem mi; 

  add(mi = new MenuItem("Open")); 

  mi.addActionListener(this); 

  add(mi = new MenuItem("Close")); 

  mi.addActionListener(this); 

  add(mi = new MenuItem("Exit")); 

  mi.addActionListener(this); 

  } 

 

  public void actionPerformed(ActionEvent e) { 

  String item = e.getActionCommand(); 

  if (item.equals("Exit"))  

  mw.exit(); 

  else  

  System.out.println("Selected FileMenu " + item); 

  } 

} 

 

class HelpMenu extends Menu implements ActionListener { 

  MainWindow mw;  

  public HelpMenu(MainWindow m) { 

  super("Help"); 

  mw = m; 

  MenuItem mi; 

  add(mi = new MenuItem("Basics")); 

  mi.addActionListener(this); 

  add(mi = new MenuItem("Advanced")); 

  mi.addActionListener(this); 

  addSeparator(); 

  add(mi = new CheckboxMenuItem("Manual")); 

  mi.addActionListener(this); 

 

  Menu subMenu = new Menu("Miscellaneous"); 

  subMenu.add(mi = new MenuItem("Help")); 

  mi.addActionListener(this); 

  subMenu.add(mi = new MenuItem("Other Option")); 

  mi.addActionListener(this); 

  add(subMenu); 

  } 

  

  public void actionPerformed(ActionEvent e) { 

  String item = e.getActionCommand(); 

  if (item.equals("Basics")) 

  System.out.println("Basics"); 

  else if (item.equals("Help"))  

  System.out.println("Help"); 

  } 

}

Output of the program:

C:\newprgrm>javac MainWindow.java

C:\newprgrm>java MainWindow

Download this example.

Related Tags for Menus:
c, application, object, io, objects, menu, name, nsis, app, with, e, it, ls, can, li, dev, in, as, m, ca, j, es, sts, me, obj, pp, cat, s, so, at, is, develop, cons, s, s, th, st, ati, ap, cts, lso, indic, je, ica, ica, pl, nd, on, o

«Previous Index Next»