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Showing content from https://docs.oracle.com/en/java/javase/19/docs/api/java.desktop/java/awt/event/ActionEvent.html below:

ActionEvent (Java SE 19 & JDK 19)

All Implemented Interfaces:

Serializable

A semantic event which indicates that a component-defined action occurred. This high-level event is generated by a component (such as a

) when the component-specific action occurs (such as being pressed). The event is passed to every

object that registered to receive such events using the component's

method.

Note: To invoke an ActionEvent on a Button using the keyboard, use the Space bar.

The object that implements the ActionListener interface gets this ActionEvent when the event occurs. The listener is therefore spared the details of processing individual mouse movements and mouse clicks, and can instead process a "meaningful" (semantic) event like "button pressed".

An unspecified behavior will be caused if the id parameter of any particular ActionEvent instance is not in the range from ACTION_FIRST to ACTION_LAST.

Since:

1.1

See Also:

• ActionListener
• Tutorial: How to Write an Action Listener
• Serialized Form

• Field Summary

  Fields

  static final int

  The first number in the range of ids used for action events.

  static final int

  The last number in the range of ids used for action events.

  static final int

  This event id indicates that a meaningful action occurred.

  static final int

  static final int

  static final int

  static final int

  Fields declared in class java.awt.AWTEventACTION_EVENT_MASK, ADJUSTMENT_EVENT_MASK, COMPONENT_EVENT_MASK, consumed, CONTAINER_EVENT_MASK, FOCUS_EVENT_MASK, HIERARCHY_BOUNDS_EVENT_MASK, HIERARCHY_EVENT_MASK, id, INPUT_METHOD_EVENT_MASK, INVOCATION_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, MOUSE_WHEEL_EVENT_MASK, PAINT_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK, WINDOW_FOCUS_EVENT_MASK, WINDOW_STATE_EVENT_MASK
• Constructor Summary

  Constructors

  Constructs an ActionEvent object.

  Constructs an ActionEvent object with modifier keys.

  Constructs an ActionEvent object with the specified modifier keys and timestamp.

• Method Summary

  Returns the command string associated with this action.

  int

  Returns the modifier keys held down during this action event.

  long

  Returns the timestamp of when this event occurred.

  Returns a parameter string identifying this action event.

• Field Details
  • SHIFT_MASK

    public static final int SHIFT_MASK

    The shift modifier. An indicator that the shift key was held down during the event.

    See Also:

    • Constant Field Values

  • CTRL_MASK

    public static final int CTRL_MASK

    The control modifier. An indicator that the control key was held down during the event.

    See Also:

    • Constant Field Values

  • META_MASK

    public static final int META_MASK

    The meta modifier. An indicator that the meta key was held down during the event.

    See Also:

    • Constant Field Values

  • ALT_MASK

    public static final int ALT_MASK

    The alt modifier. An indicator that the alt key was held down during the event.

    See Also:

    • Constant Field Values

  • ACTION_FIRST

    public static final int ACTION_FIRST

    The first number in the range of ids used for action events.

    See Also:

    • Constant Field Values

  • ACTION_LAST

    public static final int ACTION_LAST

    The last number in the range of ids used for action events.

    See Also:

    • Constant Field Values

  • ACTION_PERFORMED @Native public static final int ACTION_PERFORMED

    This event id indicates that a meaningful action occurred.

    See Also:

    • Constant Field Values

• Constructor Details
  • ActionEvent

    Constructs an

    ActionEvent

    object.

    This method throws an IllegalArgumentException if source is null. A null command string is legal, but not recommended.

    Parameters:

    source - The object that originated the event

    id - An integer that identifies the event. For information on allowable values, see the class description for ActionEvent

    command - A string that may specify a command (possibly one of several) associated with the event

    Throws:

    IllegalArgumentException - if source is null

    See Also:

    • EventObject.getSource()
    • AWTEvent.getID()
    • getActionCommand()

  • ActionEvent public ActionEvent(Object source, int id, String command, int modifiers)

    Constructs an

    ActionEvent

    object with modifier keys.

    This method throws an IllegalArgumentException if source is null. A null command string is legal, but not recommended.

    Parameters:

    source - The object that originated the event

    id - An integer that identifies the event. For information on allowable values, see the class description for ActionEvent

    command - A string that may specify a command (possibly one of several) associated with the event

    modifiers - The modifier keys down during event (shift, ctrl, alt, meta). Passing negative parameter is not recommended. Zero value means that no modifiers were passed

    Throws:

    IllegalArgumentException - if source is null

    See Also:

    • EventObject.getSource()
    • AWTEvent.getID()
    • getActionCommand()
    • getModifiers()

  • ActionEvent public ActionEvent(Object source, int id, String command, long when, int modifiers)

    Constructs an

    ActionEvent

    object with the specified modifier keys and timestamp.

    This method throws an IllegalArgumentException if source is null. A null command string is legal, but not recommended.

    Parameters:

    source - The object that originated the event

    id - An integer that identifies the event. For information on allowable values, see the class description for ActionEvent

    command - A string that may specify a command (possibly one of several) associated with the event

    when - A long that gives the time the event occurred. Passing negative or zero value is not recommended

    modifiers - The modifier keys down during event (shift, ctrl, alt, meta). Passing negative parameter is not recommended. Zero value means that no modifiers were passed

    Throws:

    IllegalArgumentException - if source is null

    Since:

    1.4

    See Also:

    • EventObject.getSource()
    • AWTEvent.getID()
    • getActionCommand()
    • getModifiers()
    • getWhen()

• Method Details
  • getActionCommand public String getActionCommand

    ()

    Note that if a null command string was passed to the constructor for this ActionEvent, this this method returns null.

    Returns:

    the string identifying the command for this event

  • getWhen

    public long getWhen()

    Returns the timestamp of when this event occurred. Because an ActionEvent is a high-level, semantic event, the timestamp is typically the same as an underlying InputEvent.

    Returns:

    this event's timestamp

    Since:

    1.4

  • getModifiers

    public int getModifiers()

    Returns the modifier keys held down during this action event.

    Returns:

    the bitwise-or of the modifier constants

  • paramString

    Returns a parameter string identifying this action event. This method is useful for event-logging and for debugging.

    Overrides:

    paramString in class AWTEvent

    Returns:

    a string identifying the event and its associated command

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