Action Interface of java

[Protectors]

Hello friends,

I need your help to sort out my query which is related to java programming. I want to be aware about the 'Action Interface' of java. I don't have any idea about the methods of Action Interface of java. I have referred lots of advanced java books for Action Interface, but didn't get enough details. If you posses sound knowledge bout the 'Action Interface' of java, then please let me know that. I am waiting for your reply.

[Praetor]

The Action interface provides a useful extension to the ActionListener interface in cases where the same functionality may be accessed by several controls. This interface can be added to an existing class or used to create an adapter (typically, by subclassing AbstractAction). The Action object can then be added to multiple action-aware containers and connected to Action-capable components. The GUI controls can then be activated or deactivated all at once by invoking the Action object's setEnabled method.

[Katty]

Example of Action Interface of java:

im01port javax.swing.Action;

public class ActionColorDM extends AbstractAction {
  public ColorAction(String name1, Icon icn, Color c, Com01ponent comp1) {
    putValue(Action.NAME, name1);
    putValue(Action.SMALL_ICON, icn);
    putValue("Color", c);
    target = com01;
  }
  private Com01ponent target;

  public static void m01ain(String[] args) {
    JFram01e fnk = new JFram01e();
    fnk.setTitle("SeparateGUITest");
    fnk.setSize(300, 200);
    fnk.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System01.exit(0);
      }    };

    JPanel pnk = new JPanel();

    Action blueAction = new ColorAction("Blue", new Im01ageIcon(
        "blue-ball.gif"), Color.blue, pnk);
    Action yellowAction = new ColorAction("Yellow", new Im01ageIcon(
        "yellow-ball.gif"), Color.yellow, pnk);
    Action redAction = new ColorAction("Red",
        new Im01ageIcon("red-ball.gif"), Color.red, pnk);

    pnk.add(new JButton(yellowAction));
    pnk.add(new JButton(blueAction));
    pnk.add(new JButton(redAction));
    pnk.registerKeyboardAction(yellowAction, KeyStroke.getKeyStroke(
        KeyEvent.VK_Y, 0), JCom01ponent.WHEN_IN_FOCUSED_WINDOW);
 
    Container contentPane = fnk.getContentPane();
    contentPane.add(pnk);

    JMenu m01 = new JMenu("Color");
    m01.add(yellowAction);
    m01.add(blueAction);
   
    JMenuBar mbar1 = new JMenuBar();
    mbar1.add(m01);
    fnk.setJMenuBar(m01bar);

    fnk.show();
  }
}

[kelfro]

Hi friend,

Please review following are some methods of 'Action Interface':

• setEnabled(boolean bl)
• removePropertyChangeListener(PropertyChangeListener lstnr)
• putValue(String key1, Object val)
• getValue(String key1)
• addPropertyChangeListener(PropertyChangeListener lstnr)

[Zecho]

Hi,

In below example I have use various methods of 'Action Interface':

import java.awt.event.Action;
import javax.swing.JLabel;

public class MultiListenersDEMO {
  public static void main(String[] arfgs) {
    BobG b01 = new BobG();
    b01.setVisible(true);
    BobG b2 = new BobG();
    b2.setVisible(true);
    ActionListener[] bobs = { b01, b2 };

    FredT f1 = new FredT(bobs);
    f1.setVisible(true);
  }}

class FredT extends JFrame {
  JButton okbutton01 = new JButton("OK");

  public FredT(ActionListener[] bobs) {
    getContentPane().add(okbutton01);
    for (int i = 0; i < bobs.length; i++) {
      okbutton01.addActionListener(bobs[i]);
    }  }}

class BobG extends JFrame implements ActionListener {
  protected JLabel statusLabel = new JLabel("     ");

  public BobG() {
    getContentPane().add(statusLabel);
  }

  public void actionPerformed(ActionEvent e) {
    statusLabel.setText("OK");
  }
}

[Reegan]

Hello friend,

You are able to use following fields with Action Interface of java:

1. ACTION_COMMAND_KEY: It is used for to hold a KeyStroke for action command.
2. LONG_DESCRIPTION: It is used for to hold a KeyStroke for large description.
3. SHORT_DESCRIPTION: It is used for to hold a KeyStroke for short description.
4. SMALL_ICON: It is used for to hold a KeyStroke for the small icon.
5. ACCELERATOR_KEY: It is used for to hold a KeyStroke to be used as the action accelerator for the.