메뉴 - Swing

java.util.EventObject

.getSource()

java.awt.AWTEvent -> java.util.EventObject

java.awt.event.ActionEvent -> java.awt.AWTEvent

javax.swing.ButtonGroup

.add()

javax.swing.AbstractButton -> javax.swing.JComponent

.addActionListener()

.setActionCommand()

.getActionCommand()

.setMnemonic()

javax.swing.JMenuItem -> javax.swing.AbstractButton

.setAccelerator()

javax.swing.JRadioButtonMenuItem -> javax.swing.JMenuItem

javax.swing.JMenu -> javax.swing.JMenuItem

.add()

javax.swing.JMenuBar -> javax.swing.JComponent

.add()

javax.swing.JPopupMenu -> javax.swing.JComponent

.add()

.addSeparator()

.show()

javax.swing.JFrame -> java.awt.Frame

.getContentPane() // java.awt.Container

.setJMenuBar()

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class MenuDemo {

 public static class MenuItemActionListener implements ActionListener {

   Component parent;

   

   public MenuItemActionListener(Component parent) { this.parent = parent; }

   

   public void actionPerformed(ActionEvent e) {

     JMenuItem item = (JMenuItem) e.getSource();

     String cmd = item.getActionCommand();

     JOptionPane.showMessageDialog(parent, cmd + " was selected.");

   }

 }

 public static JMenuItem menuItem(String label, 

  ActionListener listener, String command, 

  int mnemonic, int acceleratorKey) {

   JMenuItem item = new JMenuItem(label);

   item.addActionListener(listener);

   item.setActionCommand(command);

   if (mnemonic != 0) item.setMnemonic((char) mnemonic);

   if (acceleratorKey != 0) 

     item.setAccelerator(KeyStroke.getKeyStroke(acceleratorKey, 

java.awt.Event.CTRL_MASK));

   return item;

 }

 public static JMenuItem radioItem(String label, ActionListener listener, 

   String command, ButtonGroup mutExGroup) {

   JMenuItem item = new JRadioButtonMenuItem(label);

   item.addActionListener(listener);

   item.setActionCommand(command);

   mutExGroup.add(item);

   return item;

 }

  public static void main(String[] args) {

    JFrame frame = new JFrame("Menu Demo");

    JPanel panel = new JPanel();

    frame.getContentPane().add(panel, "Center");

    

    ActionListener listener = new MenuItemActionListener(panel);

    JMenu file = new JMenu("File");

    file.setMnemonic('F');

    file.add(menuItem("New", listener, "new", 'N', KeyEvent.VK_N));

    file.add(menuItem("Open...", listener, "open", 'O', KeyEvent.VK_O));

    ..

    JMenu edit = new JMenu("Edit");

    edit.setMnemonic('E');

    edit.add(menuItem("Cut", listener, "cut", 0, KeyEvent.VK_X));

    ..

    JMenuBar menubar = new JMenuBar();

    menubar.add(file);

    menubar.add(edit);

    frame.setJMenuBar(menubar); 

    final JPopupMenu popup = new JPopupMenu();

    

    popup.add(menuItem("Open...", listener, "open", 0, 0));

    popup.addSeparator();

    

    JMenu colors = new JMenu("Colors");

    ButtonGroup colorgroup = new ButtonGroup();

    colors.add(radioItem("Red", listener, "color(red)", colorgroup));

    colors.add(radioItem("Green", listener, "color(green)", colorgroup));

    ..

    popup.add(colors);

    panel.addMouseListener(new MouseAdapter() {

      public void mousePressed(MouseEvent e) {

if (e.isPopupTrigger()) 

 popup.show((Component)e.getSource(), e.getX(), e.getY());

      }

      

      public void mouseReleased(MouseEvent e) {

if (e.isPopupTrigger()) 

 popup.show((Component)e.getSource(), e.getX(), e.getY());

      }

    });

    frame.setSize(450, 300);

    frame.setVisible(true);

  }

}