Java JMenuBar ,JMenu and JMenuItem

Java JMenuBar ,JMenu and JMenuItem

Java JMenuBar is used to add menubar to a JFrame window.JMenu are added to JMenuBar.JMenuItems are drop down menus that are added to JMenu.

How to Declare Java JMenuBar

[ class JMenu extends JMenuItem implements MenuElement, Accessible]

Java JMenuBar Example

[

import javax.swing.JMenu;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.UIManager;

public class JavaJMenuBarExample  extends JFrame{
    public JMenuBar bar;
    public JMenuItem item1,item2,item3,item4,item5;
    public JMenu menu,sub;

    JavaJMenuBarExample ()
    {
        super("JavaJMenuBarExample ");
        try        {
            UIManager.setLookAndFee
                    ("com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel");
        }
        catch(Exception e)
        {

        }
        bar=new JMenuBar();
        menu=new JMenu("Main Menu");

        sub=new JMenu("Sub Menu");
        item1=new JMenuItem("Item 1");
        item2=new JMenuItem("Item 2");
        item3=new JMenuItem("Item 3");
        item4=new JMenuItem("Item 4");
        item5=new JMenuItem("Item 5");

        menu.add(item1);

        menu.add(item2);
        menu.add(item3);

        sub.add(item4);
        sub.add(item5);
        menu.add(sub);
        bar.add(menu);

        setJMenuBar(bar);
        setSize(400,400);
        setLocationRelativeTo(null);
        setLayout(null);
        setVisible(true);

    }

    public static void main(String args[])
    {
        new JavaJMenuBarExample();
    }



}

]

How to create a menu for a Notepad

[

import javax.swing.JMenu;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.UIManager;
import javax.swing.JTextArea;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class JavaJMenuBarExample  extends JFrame
        implements ActionListener{
    public JMenuBar bar;
    public JMenuItem newFile,copy,cut,paste,selectAll;
    public JMenu edit,file,help;
    public  JTextArea area;

    JavaJMenuBarExample ()
    {
        super("JavaJMenuBarExample ");
        try        {
            UIManager.setLookAndFeel

                    ("com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel");
        }
        catch(Exception e)
        {

        }
        area=new JTextArea();
        area.setBounds(5,5,360,320);
        add(area);
        bar=new JMenuBar();
        edit=new JMenu("Edit");

        file=new JMenu("File");
        help=new JMenu("Help");

        copy=new JMenuItem("Copy");
        cut=new JMenuItem("Cut");
        paste=new JMenuItem("Paste");
        selectAll=new JMenuItem("Select All");

        file.addActionListener(this);
        copy.addActionListener(this);
        cut.addActionListener(this);
        paste.addActionListener(this);
        selectAll.addActionListener(this);


        edit.add(cut);

        edit.add(copy);
        edit.add(paste);

        edit.add(selectAll);

        bar.add(file);
        bar.add(edit);
        bar.add(help);

        setJMenuBar(bar);
        setSize(400,400);
        setLocationRelativeTo(null);
        setLayout(null);
        setVisible(true);

    }
    public void actionPerformed(ActionEvent event)
    {
        if(event.getSource()==cut)
        {
            area.cut();

        }
        if(event.getSource()==paste)
        {
            area.paste();
        }
        if(event.getSource()==copy)
        {
            area.copy();
        }
        if(event.getSource()==selectAll)
        {
            area.selectAll();
        }
        if(event.getSource()==file)
        {
            new JavaJMenuBarExample();
        }
    }




    public static void main(String args[])
    {
        new JavaJMenuBarExample();
    }



}

]

Output

Code Explanation

Above class [ class JavaJMenuBarExample extends JFrame implements ActionListener{] implements ActionListener interface and extends JFrame class.

Once you extend a class,you can access all class method.

JFrame class methods are :-

• [ setJMenuBar(bar);]-sets JFrame menu bar.
• [setSize(400,400);]-sets JFrame size.
• [setLocationRelativeTo(null);]-positions the JFrame at the center of the window.
• [setLayout(null);]-sets no layout to JFrame.
• [setVisible(true);]-makes JFrame window visible.
• [setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);]-exits application when JFrame close button is clicked.

Code [ try {

            UIManager.setLookAndFeel

                    ("com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel");
        }
        catch(Exception e)
        {
 

        }]

sets setsLookandFeel to WindowsClassicLookAndFeel.

Code [public void actionPerformed(ActionEvent event)

    {
        if(event.getSource()==cut)
        {
            area.cut();

        }
        if(event.getSource()==paste)
        {
            area.paste();
        }
        if(event.getSource()==copy)
        {
            area.copy();
        }
        if(event.getSource()==selectAll)
        {
            area.selectAll();
        }
        if(event.getSource()==file)
        {
            new JavaJMenuBarExample();
        }
    }

]

Listens for actions performed on JMenuItems.The class implements ActionListener interface.