Creating a JMenuItem with an image

Two constructors of JMenuItem take an Icon as parameters. Try the following example with these animated! GIFs:

Main.java:

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
   
public class Main extends JFrame {
   public Main() {
      getContentPane().setLayout(new FlowLayout());
 
      JMenuBar menuBar = new JMenuBar();
      JMenu menu = new JMenu("menu");
      JMenuItem menuItem1 = new JMenuItem("male", new ImageIcon("male.gif"));
      JMenuItem menuItem2 = new JMenuItem("female", new ImageIcon("female.gif"));
      menu.add(menuItem1);
      menu.add(menuItem2);
      menuBar.add(menu);
 
      this.setJMenuBar(menuBar); 
 
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent event) {
            System.exit(0);   
         }      
      });
 
      setSize(400, 400);
   }
 
   public static void main(String[] args) {
      (new Main()).show();
   }
}

Adding a popup listener to a JTable row

Main.java:

import javax.swing.table.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.awt.*;
 
public class Main extends JFrame {
   public Main() {
      super("TableModel Demonstration");
 
      // create our own custom TableModel
      WineTableModel wineModel = new WineTableModel();
      final JTable table = new JTable(wineModel);
 
      // add rows to our TableModel, each row is represented as a Wine object
      wineModel.addWine(new Wine("Chateau Meyney, St. Estephe", "1994", 18.75f, true));
      wineModel.addWine(new Wine("Chateau Montrose, St. Estephe", "1975", 54.25f, true));
      wineModel.addWine(new Wine("Chateau Gloria, St. Julien", "1993", 22.99f, false));
      wineModel.addWine(new Wine("Chateau Beychevelle, St. Julien", "1970", 61.63f, false));
      wineModel.addWine(new Wine("Chateau La Tour de Mons, Margeaux", "1975", 57.03f, true));
      wineModel.addWine(new Wine("Chateau Brane-Cantenac, Margeaux", "1978", 49.92f, false));
 
      // create the scroll pane and add the table to it. 
      JScrollPane scrollPane = new JScrollPane(table);
 
      // add the scroll pane to this window.
      getContentPane().add(scrollPane, BorderLayout.CENTER);
 
      final TablePopup tablePopup = new TablePopup(table);
      table.addMouseListener(new MouseAdapter() {
         public void mouseReleased(MouseEvent me) {
            int row = table.rowAtPoint(me.getPoint());
            System.out.println("You clicked at row " + row);
            // possibly use row variable here to do something specific with your popup menu
            if (me.isPopupTrigger()) {
               tablePopup.show(me.getComponent(), me.getX(), me.getY());
            }
         }
      });
 
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent e) {
            System.exit(0);
         }
      });
   }
 
   public static void main(String[] args) {
      Main main = new Main();
      main.pack();
      main.setVisible(true);
   }
}
 
// a simple object that holds data about a particular wine
class Wine {
   private String  name;
   private String  vintage;
   private float   price;
   private boolean inStock;
 
   public Wine(String name, String vintage, float price, boolean inStock) {
      this.name = name;
      this.vintage = vintage;
      this.price = price;
      this.inStock = inStock;
   }
 
   public String getName()     { return name; }
   public String getVintage()  { return vintage; }
   public float  getPrice()    { return price; } 
   public boolean getInStock() { return inStock; }
 
   public String toString() { 
      return "[" + name + ", " + vintage + ", " + price + ", " + inStock + "]"; }
}
 
class WineTableModel extends AbstractTableModel {
   // holds the strings to be displayed in the column headers of our table
   final String[] columnNames = {"Name", "Vintage", "Price", "In stock?"};
 
   // holds the data types for all our columns
   final Class[] columnClasses = {String.class, String.class, Float.class, Boolean.class};
 
   // holds our data
   final Vector data = new Vector();
  
   // adds a row
   public void addWine(Wine w) {
      data.addElement(w);
      fireTableRowsInserted(data.size()-1, data.size()-1);
   }
 
   public int getColumnCount() {
      return columnNames.length;
   }
         
   public int getRowCount() {
      return data.size();
   }
 
   public String getColumnName(int col) {
      return columnNames[col];
   }
 
   public Class getColumnClass(int c) {
      return columnClasses1;
   }
 
   public Object getValueAt(int row, int col) {
      Wine wine = (Wine) data.elementAt(row);
      if (col == 0)      return wine.getName();
      else if (col == 1) return wine.getVintage();
      else if (col == 2) return new Float(wine.getPrice());
      else if (col == 3) return new Boolean(wine.getInStock());
      else return null;
   }
 
   public boolean isCellEditable(int row, int col) {
      return false;
   }
}
 
class TablePopup extends JPopupMenu {
   public TablePopup(JTable tree) {
      JMenuItem itemEdit = new JMenuItem("Edit");
      JMenuItem itemDelete = new JMenuItem("Delete");
      itemEdit.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent ae) {
            System.out.println("Edit child");
         }
      });
      itemDelete.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent ae) {
            System.out.println("Delete selected");
         }
      });
 
      add(itemEdit);
      add(new JSeparator());
      add(itemDelete);
   }
}

Adding a different tooltip for every element in my JMenuItem

Set the tooltip text for every JMenuItem.

Main.java:

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
   
public class Main extends JFrame {
   public Main() {
      getContentPane().setLayout(new FlowLayout());
 
      JMenuBar menuBar = new JMenuBar();
      JMenu menu = new JMenu("menu");
      JMenuItem menuItem1 = new JMenuItem("male");
      JMenuItem menuItem2 = new JMenuItem("female");
      menuItem1.setToolTipText("The weak sex");
      menuItem2.setToolTipText("The strong sex");
      menu.add(menuItem1);
      menu.add(menuItem2);
      menuBar.add(menu);
 
      this.setJMenuBar(menuBar); 
 
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent event) {
            System.exit(0);   
         }      
      });
 
      setSize(400, 400);
   }
 
   public static void main(String[] args) {
      (new Main()).show();
   }
}

Getting the JMenu object from the selected JMenuItem

Get the accessible parent from the accessibleContext.
Main.java:

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
   
public class Main extends JFrame implements ActionListener {
   private JMenu menu1;
   private JMenu menu2;
 
   public Main() {
      getContentPane().setLayout(new FlowLayout());
 
      JMenuBar menuBar = new JMenuBar();
      menu1 = new JMenu("The weak sex");
      JMenuItem menuItem1 = new JMenuItem("male");
      menu2 = new JMenu("The strong sex");
      JMenuItem menuItem2 = new JMenuItem("female");
      menu1.add(menuItem1);
      menu2.add(menuItem2);
      menuBar.add(menu1);
      menuBar.add(menu2);
      menuItem1.addActionListener(this);
      menuItem2.addActionListener(this);
 
      this.setJMenuBar(menuBar); 
 
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent event) {
            System.exit(0);   
         }      
      });
 
      setSize(400, 400);
   }
 
   public void actionPerformed(ActionEvent ae) {
      JMenuItem menuItem = (JMenuItem) ae.getSource();
      JMenu menu = (JMenu) menuItem.getAccessibleContext().getAccessibleParent();
      System.out.println("Selected menu: " + menu.getText());
   }
 
   public static void main(String[] args) {
      (new Main()).show();
   }
}

Adding a general JComponent to a JMenu

Create your own version of the JComponent that you would like to add to your Menu and have it implement the methods of MenuElement. Here’s an example that shows a JMenu with a JTextField and a JSlider as its elements:

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
   
public class Main extends JFrame {
   public Main() {
      getContentPane().setLayout(new FlowLayout());
 
      JMenuBar menuBar = new JMenuBar();
      JMenu menu = new JMenu("Menu");
      JMenuItem menuItem1 = new JMenuItem("item 1");
      JMenuItem menuItem2 = new JMenuItem("item 2");
      JMenuItemTextField menuItem3 = new JMenuItemTextField(20);
      JMenuItem menuItem4 = new JMenuItem("item 4");
      JMenuItemSlider menuItem5 = new JMenuItemSlider();
      menuItem5.setMajorTickSpacing(20);
      menuItem5.setMinorTickSpacing(5);
      menuItem5.setPaintTicks(true);
      JMenuItem menuItem6 = new JMenuItem("item 6");
 
      menu.add(menuItem1);
      menu.add(menuItem2);
      menu.add(menuItem3);
      menu.add(menuItem4);
      menu.add(menuItem5);
      menu.add(menuItem6);
 
      menuBar.add(menu);
 
      this.setJMenuBar(menuBar); 
 
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent event) {
            System.exit(0);   
         }      
      });
 
      setSize(400, 400);
   }
  
   public static void main(String[] args) {
      (new Main()).show();
   }
}
 
class JMenuItemTextField extends JTextField implements MenuElement
{
   public JMenuItemTextField(int length) {
      super(length);
   }
 
   public Component getComponent() {
      return this;
   }
 
   public MenuElement[] getSubElements() {
      return null;
   }
 
   public void menuSelectionChanged(boolean changed) {
   }
 
   public void processKeyEvent(KeyEvent kevt, MenuElement[] me, MenuSelectionManager msm) {
   }
 
   public void processMouseEvent(MouseEvent mevt, MenuElement[] me, MenuSelectionManager msm) {
   }
}
 
class JMenuItemSlider extends JSlider implements MenuElement
{
   public JMenuItemSlider() {
      super();
   }
 
   public Component getComponent() {
      return this;
   }
 
   public MenuElement[] getSubElements() {
      return null;
   }
 
   public void menuSelectionChanged(boolean changed) {
   }
 
   public void processKeyEvent(KeyEvent kevt, MenuElement[] me, MenuSelectionManager msm) {
   }
 
   public void processMouseEvent(MouseEvent mevt, MenuElement[] me, MenuSelectionManager msm) {
   }
}

Disable the keyboard accellerator that has been assigned to a JMenuItem

Set the accelerator to null. This example assigns accelerators to the JMenuItems ‘male’ and ‘female’. Press CTRL-M and CTRL-F to invoke them. After 5 selections, the accelerators will be disabled.

Main.java:

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
   
public class Main extends JFrame implements ActionListener {
   JMenuItem menuItem1;
   JMenuItem menuItem2;
 
   public Main() {
      getContentPane().setLayout(new FlowLayout());
 
      JMenuBar menuBar = new JMenuBar();
      JMenu menu = new JMenu("Sex");
      menuItem1 = new JMenuItem("male");
      menuItem2 = new JMenuItem("female");
 
      // add the MenuItems to the Menu 
      menu.add(menuItem1);
      menu.add(menuItem2);
      menuItem1.setAccelerator(KeyStroke.getKeyStroke('M', Event.CTRL_MASK));
      menuItem2.setAccelerator(KeyStroke.getKeyStroke('F', Event.CTRL_MASK));
 
      // listen for events on these MenuItems
      menuItem1.addActionListener(this);
      menuItem2.addActionListener(this);
 
      menuBar.add(menu);
 
      this.setJMenuBar(menuBar); 
 
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent event) {
            System.exit(0);   
         }      
      });
 
      setSize(400, 400);
   }
 
   private int count = 0;
   public void actionPerformed(ActionEvent ae) {
      System.out.println(ae.getActionCommand());
 
      count++;
      if (count == 5) {
         System.out.println("now disabling accelerators");
 
         menuItem1.setAccelerator(null);
         menuItem2.setAccelerator(null);
      }
   }
 
   public static void main(String[] args) {
      (new Main()).show();
   }
}

Changing the font of a JMenuItem

You can either embed HTML in the JMenuItem’s text, or you can call the method setFont.

Main.java:

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
   
public class Main extends JFrame {
   public Main() {
      getContentPane().setLayout(new FlowLayout());
 
      JMenuBar menuBar = new JMenuBar();
      JMenu menu = new JMenu("Sex");
      JMenuItem menuItem1 = new JMenuItem("<html><font size=-1>male</font></html>");
      JMenuItem menuItem2 = new JMenuItem("<html><font size=+1>female</font></html>");
      JMenuItem menuItem3 = new JMenuItem("androgyne");
      menuItem3.setFont(new Font("Monospaced", Font.ITALIC, 36));
 
      // add the MenuItems to the Menu 
      menu.add(menuItem1);
      menu.add(menuItem2);
      menu.add(menuItem3);
 
      menuBar.add(menu);
 
      this.setJMenuBar(menuBar); 
 
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent event) {
            System.exit(0);   
         }      
      });
 
      setSize(400, 400);
   }
 
   public static void main(String[] args) {
      (new Main()).show();
   }
}

Displaying the description of a JMenuItem in the statusbar when moving over it

Add a ChangeListener. Here’s an example:

Main.java:

import javax.swing.event.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
   
public class Main extends JFrame {
   public Main() {
      getContentPane().setLayout(new BorderLayout());
 
      JMenuBar menuBar = new JMenuBar();
      JMenu menu = new JMenu("Sex");
      JMenuItem menuItem1 = new JMenuItem("male");
      JMenuItem menuItem2 = new JMenuItem("female");
      JMenuItem menuItem3 = new JMenuItem("androgyne");
 
      // add the MenuItems to the Menu 
      menu.add(menuItem1);
      menu.add(menuItem2);
      menu.add(menuItem3);
 
      StatusBar statusBar = new StatusBar();
 
      new JMenuItemHelpText(menuItem1, "The weak sex", statusBar);
      new JMenuItemHelpText(menuItem2, "The strong sex", statusBar);
      new JMenuItemHelpText(menuItem3, "The average sex, I guess", statusBar);
 
      menuBar.add(menu);
 
      this.setJMenuBar(menuBar); 
      getContentPane().add(BorderLayout.SOUTH, statusBar);
 
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent event) {
            System.exit(0);   
         }      
      });
 
      setSize(400, 400);
   }
 
   public static void main(String[] args) {
      (new Main()).show();
   }
}
 
class JMenuItemHelpText implements ChangeListener
{
   JMenuItem menuItem;
   String helpText;
   StatusBar statusBar;
 
   JMenuItemHelpText(JMenuItem menuItem, String helpText, StatusBar statusBar) {
      this.menuItem = menuItem;
      this.helpText = helpText;
      this.statusBar = statusBar;
      menuItem.addChangeListener(this);
   } 
 
   public void stateChanged(ChangeEvent evt)
   {
      if (menuItem.isArmed())
         statusBar.setStatus(helpText);
      else
         statusBar.setStatus("");
   }
}
 
class StatusBar extends JPanel
{
   private JLabel statusLabel;
 
   public StatusBar() {
      setLayout(new BorderLayout(2, 2));
      statusLabel = new JLabel("Ready");
      statusLabel.setBorder(BorderFactory.createLoweredBevelBorder());
      statusLabel.setForeground(Color.black);
 
      add(BorderLayout.CENTER, statusLabel);
       
      JLabel dummyLabel = new JLabel("       ");
      dummyLabel.setBorder(BorderFactory.createLoweredBevelBorder());
 
      add(BorderLayout.EAST, dummyLabel);
   }
 
   public void setStatus(String status) {
      if (status.equals("")) 
         statusLabel.setText("Ready");
      else
         statusLabel.setText(status);
   }
 
   public String getStatus() {
      return statusLabel.getText();
   }
}

Justifying the text on a JMenuItem

You have a number of functions:setHorizontalAlignment, setHorizontalTextPosition, setVerticalAlignment, setVerticalTextPosition. Look at the API docs for more information about their behaviour.

Main.java:

import javax.swing.event.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
   
public class Main extends JFrame {
   public Main() {
      getContentPane().setLayout(new FlowLayout());
 
      JMenuBar menuBar = new JMenuBar();
      JMenu menu = new JMenu("Sex");
      JMenuItem menuItem0 = new JMenuItem("NO ALIGNMENT");
      JMenuItem menuItem1 = new JMenuItem("CENTER");
      JMenuItem menuItem2 = new JMenuItem("LEFT");
      JMenuItem menuItem3 = new JMenuItem("RIGHT");
      JMenuItem menuItem4 = new JMenuItem("LEADING");
      JMenuItem menuItem5 = new JMenuItem("TRAILING");
 
      // add the MenuItems to the Menu 
      menu.add(menuItem0);
      menu.add(menuItem1);
      menu.add(menuItem2);
      menu.add(menuItem3);
      menu.add(menuItem4);
      menu.add(menuItem5);
   
      menuItem1.setHorizontalAlignment(SwingConstants.CENTER);
      menuItem2.setHorizontalAlignment(SwingConstants.LEFT);
      menuItem3.setHorizontalAlignment(SwingConstants.RIGHT);
      menuItem4.setHorizontalAlignment(SwingConstants.LEADING);
      menuItem5.setHorizontalAlignment(SwingConstants.TRAILING);
 
      menuBar.add(menu);
 
      this.setJMenuBar(menuBar); 
 
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent event) {
            System.exit(0);   
         }      
      });
 
      setSize(400, 400);
   }
 
   public static void main(String[] args) {
      (new Main()).show();
   }
}

Dynamically removing a separator from a JMenu

Look in the JMenu API for the remove methods!

Main.java:

import javax.swing.event.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
   
public class Main extends JFrame {
   public Main() {
      getContentPane().setLayout(new FlowLayout());
 
      JMenuBar menuBar = new JMenuBar();
      // used in inner class, so final
      final JMenu menu = new JMenu("Sex");
      JMenuItem menuItem0 = new JMenuItem("female");
      JMenuItem menuItem1 = new JMenuItem("male");
      JMenuItem menuItem2 = new JMenuItem("androgyn");
 
      // add the MenuItems to the Menu 
      menu.add(menuItem0);
      menu.add(menuItem1);
 
      // used in inner class, so final
      final JSeparator jsep = new JSeparator();
      menu.add(jsep);
      menu.add(menuItem2);
   
      menuBar.add(menu);
 
      this.setJMenuBar(menuBar); 
      final JButton button = new JButton("remove menu separator");
      button.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent ae) {
            menu.remove(jsep);
            button.setEnabled(false);
         }
      });
      getContentPane().add(button);
 
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent event) {
            System.exit(0);   
         }      
      });
 
      setSize(400, 400);
   }
 
   public static void main(String[] args) {
      (new Main()).show();
   }
}