Using an Action

This example creates an Action for both a menu item and a toolbar, displaying both components and allowing the user to click on either one. When the components are clicked, the actionPerformed( ) method of the action is called.

Here the code :

// ActionExample.java
//
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class ActionExample extends JPanel {

public JMenuBar menuBar;
public JToolBar toolBar;

public ActionExample( ) {
super(true);

// Create a menu bar and give it a bevel border.
menuBar = new JMenuBar( );
menuBar.setBorder(new BevelBorder(BevelBorder.RAISED));

// Create a menu and add it to the menu bar.
JMenu menu = new JMenu(”Menu”);
menuBar.add(menu);

// Create a toolbar and give it an etched border.
toolBar = new JToolBar( );
toolBar.setBorder(new EtchedBorder( ));

// Instantiate a sample action with the NAME property of “Download” and the
// appropriate SMALL_ICON property.
SampleAction exampleAction = new SampleAction(”Download”,
new ImageIcon(”action.gif”));

// Finally, add the sample action to the menu and the toolbar. These methods
// are no longer preferred:
// menu.add(exampleAction);
// toolBar.add(exampleAction);
// Instead, you should create actual menu items and buttons:
JMenuItem exampleItem = new JMenuItem(exampleAction);
JButton exampleButton = new JButton(exampleAction);
menu.add(exampleItem);
toolBar.add(exampleButton);
}

class SampleAction extends AbstractAction {
// This is our sample action. It must have an actionPerformed( ) method, which
// is called when the action should be invoked.
public SampleAction(String text, Icon icon) {
super(text,icon);
}

public void actionPerformed(ActionEvent e) {
System.out.println(”Action [" + e.getActionCommand( ) + "] performed!”);
}
}

public static void main(String s[]) {
ActionExample example = new ActionExample( );
JFrame frame = new JFrame(”Action Example”);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setJMenuBar(example.menuBar);
frame.getContentPane( ).add(example.toolBar, BorderLayout.NORTH);
frame.setSize(200,200);
frame.setVisible(true);
}
}

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