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## java.awt.event
Class KeyEvent

    java.lang.Object
      java.util.EventObject
          java.awt.AWTEvent
              java.awt.event.ComponentEvent
                  java.awt.event.InputEvent
                      java.awt.event.KeyEvent

All Implemented Interfaces:
  Serializable

Direct Known Subclasses:
  MenuKeyEvent

    public class KeyEvent

extends InputEvent

An event which indicates that a keystroke occurred in a component.

This low-level event is generated by a component object (such as a text field) when a key is pressed, released, or typed. The event is passed to every `KeyListener` or `KeyAdapter` object which registered to receive such events using the component's `addKeyListener` method. (`KeyAdapter` objects implement the `KeyListener` interface.) Each such listener object gets this `KeyEvent` when the event occurs.

"Key typed" events are higher-level and generally do not depend on the platform or keyboard layout. They are generated when a Unicode character is entered, and are the preferred way to find out about character input. In the simplest case, a key typed event is produced by a single key press (e.g., 'a'). Often, however, characters are produced by series of key presses (e.g., 'shift' + 'a'), and the mapping from key pressed events to key typed events may be many-to-one or many-to-many. Key releases are not usually necessary to generate a key typed event, but there are some cases where the key typed event is not generated until a key is released (e.g., entering ASCII sequences via the Alt-Numpad method in Windows). No key typed events are generated for keys that don't generate Unicode characters (e.g., action keys, modifier keys, etc.).

The getKeyChar method always returns a valid Unicode character or CHAR_UNDEFINED. Character input is reported by KEY_TYPED events: KEY_PRESSED and KEY_RELEASED events are not necessarily associated with character input. Therefore, the result of the getKeyChar method is guaranteed to be meaningful only for KEY_TYPED events.

For key pressed and key released events, the getKeyCode method returns the event's keyCode. For key typed events, the getKeyCode method always returns VK_UNDEFINED.

"Key pressed" and "key released" events are lower-level and depend on the platform and keyboard layout. They are generated whenever a key is pressed or released, and are the only way to find out about keys that don't generate character input (e.g., action keys, modifier keys, etc.). The key being pressed or released is indicated by the getKeyCode method, which returns a virtual key code.

Virtual key codes are used to report which keyboard key has been pressed, rather than a character generated by the combination of one or more keystrokes (such as "A", which comes from shift and "a").

For example, pressing the Shift key will cause a KEY_PRESSED event with a VK_SHIFT keyCode, while pressing the 'a' key will result in a VK_A keyCode. After the 'a' key is released, a KEY_RELEASED event will be fired with VK_A. Separately, a KEY_TYPED event with a keyChar value of 'A' is generated.

Notes:

- Key combinations which do not result in Unicode characters, such as action keys like F1 and the HELP key, do not generate KEY_TYPED events.
- Not all keyboards or systems are capable of generating all virtual key codes. No attempt is made in Java to generate these keys artificially.
- Virtual key codes do not identify a physical key: they depend on the platform and keyboard layout. For example, the key that generates VK_Q when using a U.S. keyboard layout will generate VK_A when using a French keyboard layout.
- Not all characters have a keycode associated with them. For example, there is no keycode for the question mark because there is no keyboard for which it appears on the primary layer.
- In order to support the platform-independent handling of action keys, the Java platform uses a few additional virtual key constants for functions that would otherwise have to be recognized by interpreting virtual key codes and modifiers. For example, for Japanese Windows keyboards, VK_ALL_CANDIDATES is returned instead of VK_CONVERT with the ALT modifier.

WARNING: Aside from those keys that are defined by the Java language (VK_ENTER, VK_BACK_SPACE, and VK_TAB), do not rely on the values of the VK_ constants. Sun reserves the right to change these values as needed to accomodate a wider range of keyboards in the future.

Since:
  1.1
See Also:
  `KeyAdapter`, `KeyListener`, Tutorial: Writing a Key Listener, Reference: The Java Class Libraries (update file), Serialized Form

Field Summary
`static char` | `CHAR_UNDEFINED` KEY_PRESSED and KEY_RELEASED events which do not map to a valid Unicode character use this for the keyChar value.
`static int` | `KEY_FIRST` The first number in the range of ids used for key events.
`static int` | `KEY_LAST` The last number in the range of ids used for key events.
`static int` | `KEY_LOCATION_LEFT` A constant indicating that the key pressed or released is in the left key location (there is more than one possible location for this key).
`static int` | `KEY_LOCATION_NUMPAD` A constant indicating that the key event originated on the numeric keypad or with a virtual key corresponding to the numeric keypad.
`static int` | `KEY_LOCATION_RIGHT` A constant indicating that the key pressed or released is in the right key location (there is more than one possible location for this key).
`static int` | `KEY_LOCATION_STANDARD` A constant indicating that the key pressed or released is not distinguished as the left or right version of a key, and did not originate on the numeric keypad (or did not originate with a virtual key corresponding to the numeric keypad).
`static int` | `KEY_LOCATION_UNKNOWN` A constant indicating that the keyLocation is indeterminate or not relevant.
`static int` | `KEY_PRESSED` The "key pressed" event.
`static int` | `KEY_RELEASED` The "key released" event.
`static int` | `KEY_TYPED` The "key typed" event.
`static int` | `VK_0` VK_0 thru VK_9 are the same as ASCII '0' thru '9' (0x30 - 0x39)
`static int` | `VK_1`
`static int` | `VK_2`
`static int` | `VK_3`
`static int` | `VK_4`
`static int` | `VK_5`
`static int` | `VK_6`
`static int` | `VK_7`
`static int` | `VK_8`
`static int` | `VK_9`
`static int` | `VK_A` VK_A thru VK_Z are the same as ASCII 'A' thru 'Z' (0x41 - 0x5A)
`static int` | `VK_ACCEPT` Constant for the Accept or Commit function key.
`static int` | `VK_ADD`
`static int` | `VK_AGAIN`
`static int` | `VK_ALL_CANDIDATES` Constant for the All Candidates function key.
`static int` | `VK_ALPHANUMERIC` Constant for the Alphanumeric function key.
`static int` | `VK_ALT`
`static int` | `VK_ALT_GRAPH` Constant for the AltGraph function key.
`static int` | `VK_AMPERSAND`
`static int` | `VK_ASTERISK`
`static int` | `VK_AT` Constant for the "@" key.
`static int` | `VK_B`
`static int` | `VK_BACK_QUOTE`
`static int` | `VK_BACK_SLASH` Constant for the back slash key, "\"
`static int` | `VK_BACK_SPACE`
`static int` | `VK_BEGIN` Constant for the Begin key.
`static int` | `VK_BRACELEFT`
`static int` | `VK_BRACERIGHT`
`static int` | `VK_C`
`static int` | `VK_CANCEL`
`static int` | `VK_CAPS_LOCK`
`static int` | `VK_CIRCUMFLEX` Constant for the "^" key.
`static int` | `VK_CLEAR`
`static int` | `VK_CLOSE_BRACKET` Constant for the close bracket key, "]"
`static int` | `VK_CODE_INPUT` Constant for the Code Input function key.
`static int` | `VK_COLON` Constant for the ":" key.
`static int` | `VK_COMMA` Constant for the comma key, ","
`static int` | `VK_COMPOSE` Constant for the Compose function key.
`static int` | `VK_CONTEXT_MENU` Constant for the Microsoft Windows Context Menu key.
`static int` | `VK_CONTROL`
`static int` | `VK_CONVERT` Constant for the Convert function key.
`static int` | `VK_COPY`
`static int` | `VK_CUT`
`static int` | `VK_D`
`static int` | `VK_DEAD_ABOVEDOT`
`static int` | `VK_DEAD_ABOVERING`
`static int` | `VK_DEAD_ACUTE`
`static int` | `VK_DEAD_BREVE`
`static int` | `VK_DEAD_CARON`
`static int` | `VK_DEAD_CEDILLA`
`static int` | `VK_DEAD_CIRCUMFLEX`
`static int` | `VK_DEAD_DIAERESIS`
`static int` | `VK_DEAD_DOUBLEACUTE`
`static int` | `VK_DEAD_GRAVE`
`static int` | `VK_DEAD_IOTA`
`static int` | `VK_DEAD_MACRON`
`static int` | `VK_DEAD_OGONEK`
`static int` | `VK_DEAD_SEMIVOICED_SOUND`
`static int` | `VK_DEAD_TILDE`
`static int` | `VK_DEAD_VOICED_SOUND`
`static int` | `VK_DECIMAL`
`static int` | `VK_DELETE`
`static int` | `VK_DIVIDE`
`static int` | `VK_DOLLAR` Constant for the "$" key.
`static int` | `VK_DOWN` Constant for the non-numpad down arrow key.
`static int` | `VK_E`
`static int` | `VK_END`
`static int` | `VK_ENTER`
`static int` | `VK_EQUALS` Constant for the equals key, "="
`static int` | `VK_ESCAPE`
`static int` | `VK_EURO_SIGN` Constant for the Euro currency sign key.
`static int` | `VK_EXCLAMATION_MARK` Constant for the "!" key.
`static int` | `VK_F`
`static int` | `VK_F1` Constant for the F1 function key.
`static int` | `VK_F10` Constant for the F10 function key.
`static int` | `VK_F11` Constant for the F11 function key.
`static int` | `VK_F12` Constant for the F12 function key.
`static int` | `VK_F13` Constant for the F13 function key.
`static int` | `VK_F14` Constant for the F14 function key.
`static int` | `VK_F15` Constant for the F15 function key.
`static int` | `VK_F16` Constant for the F16 function key.
`static int` | `VK_F17` Constant for the F17 function key.
`static int` | `VK_F18` Constant for the F18 function key.
`static int` | `VK_F19` Constant for the F19 function key.
`static int` | `VK_F2` Constant for the F2 function key.
`static int` | `VK_F20` Constant for the F20 function key.
`static int` | `VK_F21` Constant for the F21 function key.
`static int` | `VK_F22` Constant for the F22 function key.
`static int` | `VK_F23` Constant for the F23 function key.
`static int` | `VK_F24` Constant for the F24 function key.
`static int` | `VK_F3` Constant for the F3 function key.
`static int` | `VK_F4` Constant for the F4 function key.
`static int` | `VK_F5` Constant for the F5 function key.
`static int` | `VK_F6` Constant for the F6 function key.
`static int` | `VK_F7` Constant for the F7 function key.
`static int` | `VK_F8` Constant for the F8 function key.
`static int` | `VK_F9` Constant for the F9 function key.
`static int` | `VK_FINAL`
`static int` | `VK_FIND`
`static int` | `VK_FULL_WIDTH` Constant for the Full-Width Characters function key.
`static int` | `VK_G`
`static int` | `VK_GREATER`
`static int` | `VK_H`
`static int` | `VK_HALF_WIDTH` Constant for the Half-Width Characters function key.
`static int` | `VK_HELP`
`static int` | `VK_HIRAGANA` Constant for the Hiragana function key.
`static int` | `VK_HOME`
`static int` | `VK_I`
`static int` | `VK_INPUT_METHOD_ON_OFF` Constant for the input method on/off key.
`static int` | `VK_INSERT`
`static int` | `VK_INVERTED_EXCLAMATION_MARK` Constant for the inverted exclamation mark key.
`static int` | `VK_J`
`static int` | `VK_JAPANESE_HIRAGANA` Constant for the Japanese-Hiragana function key.
`static int` | `VK_JAPANESE_KATAKANA` Constant for the Japanese-Katakana function key.
`static int` | `VK_JAPANESE_ROMAN` Constant for the Japanese-Roman function key.
`static int` | `VK_K`
`static int` | `VK_KANA`
`static int` | `VK_KANA_LOCK` Constant for the locking Kana function key.
`static int` | `VK_KANJI`
`static int` | `VK_KATAKANA` Constant for the Katakana function key.
`static int` | `VK_KP_DOWN` Constant for the numeric keypad down arrow key.
`static int` | `VK_KP_LEFT` Constant for the numeric keypad left arrow key.
`static int` | `VK_KP_RIGHT` Constant for the numeric keypad right arrow key.
`static int` | `VK_KP_UP` Constant for the numeric keypad up arrow key.
`static int` | `VK_L`
`static int` | `VK_LEFT` Constant for the non-numpad left arrow key.
`static int` | `VK_LEFT_PARENTHESIS` Constant for the "(" key.
`static int` | `VK_LESS`
`static int` | `VK_M`
`static int` | `VK_META`
`static int` | `VK_MINUS` Constant for the minus key, "-"
`static int` | `VK_MODECHANGE`
`static int` | `VK_MULTIPLY`
`static int` | `VK_N`
`static int` | `VK_NONCONVERT` Constant for the Don't Convert function key.
`static int` | `VK_NUM_LOCK`
`static int` | `VK_NUMBER_SIGN` Constant for the "#" key.
`static int` | `VK_NUMPAD0`
`static int` | `VK_NUMPAD1`
`static int` | `VK_NUMPAD2`
`static int` | `VK_NUMPAD3`
`static int` | `VK_NUMPAD4`
`static int` | `VK_NUMPAD5`
`static int` | `VK_NUMPAD6`
`static int` | `VK_NUMPAD7`
`static int` | `VK_NUMPAD8`
`static int` | `VK_NUMPAD9`
`static int` | `VK_O`
`static int` | `VK_OPEN_BRACKET` Constant for the open bracket key, "["
`static int` | `VK_P`
`static int` | `VK_PAGE_DOWN`
`static int` | `VK_PAGE_UP`
`static int` | `VK_PASTE`
`static int` | `VK_PAUSE`
`static int` | `VK_PERIOD` Constant for the period key, "."
`static int` | `VK_PLUS` Constant for the "+" key.
`static int` | `VK_PREVIOUS_CANDIDATE` Constant for the Previous Candidate function key.
`static int` | `VK_PRINTSCREEN`
`static int` | `VK_PROPS`
`static int` | `VK_Q`
`static int` | `VK_QUOTE`
`static int` | `VK_QUOTEDBL`
`static int` | `VK_R`
`static int` | `VK_RIGHT` Constant for the non-numpad right arrow key.
`static int` | `VK_RIGHT_PARENTHESIS` Constant for the ")" key.
`static int` | `VK_ROMAN_CHARACTERS` Constant for the Roman Characters function key.
`static int` | `VK_S`
`static int` | `VK_SCROLL_LOCK`
`static int` | `VK_SEMICOLON` Constant for the semicolon key, ";"
`static int` | `VK_SEPARATER` This constant is obsolete, and is included only for backwards compatibility.
`static int` | `VK_SEPARATOR` Constant for the Numpad Separator key.
`static int` | `VK_SHIFT`
`static int` | `VK_SLASH` Constant for the forward slash key, "/"
`static int` | `VK_SPACE`
`static int` | `VK_STOP`
`static int` | `VK_SUBTRACT`
`static int` | `VK_T`
`static int` | `VK_TAB`
`static int` | `VK_U`
`static int` | `VK_UNDEFINED` This value is used to indicate that the keyCode is unknown.
`static int` | `VK_UNDERSCORE` Constant for the "_" key.
`static int` | `VK_UNDO`
`static int` | `VK_UP` Constant for the non-numpad up arrow key.
`static int` | `VK_V`
`static int` | `VK_W`
`static int` | `VK_WINDOWS` Constant for the Microsoft Windows "Windows" key.
`static int` | `VK_X`
`static int` | `VK_Y`
`static int` | `VK_Z`

Fields inherited from class java.awt.event.InputEvent
`ALT_DOWN_MASK, ALT_GRAPH_DOWN_MASK, ALT_GRAPH_MASK, ALT_MASK, BUTTON1_DOWN_MASK, BUTTON1_MASK, BUTTON2_DOWN_MASK, BUTTON2_MASK, BUTTON3_DOWN_MASK, BUTTON3_MASK, CTRL_DOWN_MASK, CTRL_MASK, META_DOWN_MASK, META_MASK, SHIFT_DOWN_MASK, SHIFT_MASK`

Fields inherited from class java.awt.event.ComponentEvent
`COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN`

Fields inherited from class java.awt.AWTEvent
`ACTION_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`

Fields inherited from class java.util.EventObject
`source`

Constructor Summary
`KeyEvent(Component source, int id, long when, int modifiers, int keyCode)` Deprecated. as of JDK1.1
`KeyEvent(Component source, int id, long when, int modifiers, int keyCode, char keyChar)` Constructs a `KeyEvent` object.
`KeyEvent(Component source, int id, long when, int modifiers, int keyCode, char keyChar, int keyLocation)`

Method Summary
`char` | `getKeyChar()` Returns the character associated with the key in this event.
`int` | `getKeyCode()` Returns the integer keyCode associated with the key in this event.
`int` | `getKeyLocation()` Returns the location of the key that originated this key event.
`static String` | `getKeyModifiersText(int modifiers)` Returns a `String` describing the modifier key(s), such as "Shift", or "Ctrl+Shift".
`static String` | `getKeyText(int keyCode)` Returns a String describing the keyCode, such as "HOME", "F1" or "A".
`boolean` | `isActionKey()` Returns whether the key in this event is an "action" key.
`String` | `paramString()` Returns a parameter string identifying this event.
`void` | `setKeyChar(char keyChar)` Set the keyChar value to indicate a logical character.
`void` | `setKeyCode(int keyCode)` Set the keyCode value to indicate a physical key.
`void` | `setModifiers(int modifiers)` Deprecated. as of JDK1.1.4

Methods inherited from class java.awt.event.InputEvent
`consume, getModifiers, getModifiersEx, getModifiersExText, getWhen, isAltDown, isAltGraphDown, isConsumed, isControlDown, isMetaDown, isShiftDown`

Methods inherited from class java.awt.event.ComponentEvent
`getComponent`

Methods inherited from class java.awt.AWTEvent
`getID, setSource, toString`

Methods inherited from class java.util.EventObject
`getSource`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### KEY_FIRST

    public static final int KEY_FIRST

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

  See Also:
    Constant Field Values

### KEY_LAST

    public static final int KEY_LAST

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

  See Also:
    Constant Field Values

### KEY_TYPED

    public static final int KEY_TYPED

  The "key typed" event. This event is generated when a character is entered. In the simplest case, it is produced by a single key press. Often, however, characters are produced by series of key presses, and the mapping from key pressed events to key typed events may be many-to-one or many-to-many.

  See Also:
    Constant Field Values

### KEY_PRESSED

    public static final int KEY_PRESSED

  The "key pressed" event. This event is generated when a key is pushed down.

  See Also:
    Constant Field Values

### KEY_RELEASED

    public static final int KEY_RELEASED

  The "key released" event. This event is generated when a key is let up.

  See Also:
    Constant Field Values

### VK_ENTER

    public static final int VK_ENTER

See Also:
  Constant Field Values

### VK_BACK_SPACE

    public static final int VK_BACK_SPACE

See Also:
  Constant Field Values

### VK_TAB

    public static final int VK_TAB

See Also:
  Constant Field Values

### VK_CANCEL

    public static final int VK_CANCEL

See Also:
  Constant Field Values

### VK_CLEAR

    public static final int VK_CLEAR

See Also:
  Constant Field Values

### VK_SHIFT

    public static final int VK_SHIFT

See Also:
  Constant Field Values

### VK_CONTROL

    public static final int VK_CONTROL

See Also:
  Constant Field Values

### VK_ALT

    public static final int VK_ALT

See Also:
  Constant Field Values

### VK_PAUSE

    public static final int VK_PAUSE

See Also:
  Constant Field Values

### VK_CAPS_LOCK

    public static final int VK_CAPS_LOCK

See Also:
  Constant Field Values

### VK_ESCAPE

    public static final int VK_ESCAPE

See Also:
  Constant Field Values

### VK_SPACE

    public static final int VK_SPACE

See Also:
  Constant Field Values

### VK_PAGE_UP

    public static final int VK_PAGE_UP

See Also:
  Constant Field Values

### VK_PAGE_DOWN

    public static final int VK_PAGE_DOWN

See Also:
  Constant Field Values

### VK_END

    public static final int VK_END

See Also:
  Constant Field Values

### VK_HOME

    public static final int VK_HOME

See Also:
  Constant Field Values

### VK_LEFT

    public static final int VK_LEFT

  Constant for the non-numpad left arrow key.

  See Also:
    `VK_KP_LEFT`, Constant Field Values

### VK_UP

    public static final int VK_UP

  Constant for the non-numpad up arrow key.

  See Also:
    `VK_KP_UP`, Constant Field Values

### VK_RIGHT

    public static final int VK_RIGHT

  Constant for the non-numpad right arrow key.

  See Also:
    `VK_KP_RIGHT`, Constant Field Values

### VK_DOWN

    public static final int VK_DOWN

  Constant for the non-numpad down arrow key.

  See Also:
    `VK_KP_DOWN`, Constant Field Values

### VK_COMMA

    public static final int VK_COMMA

  Constant for the comma key, ","

  See Also:
    Constant Field Values

### VK_MINUS

    public static final int VK_MINUS

  Constant for the minus key, "-"

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_PERIOD

    public static final int VK_PERIOD

  Constant for the period key, "."

  See Also:
    Constant Field Values

### VK_SLASH

    public static final int VK_SLASH

  Constant for the forward slash key, "/"

  See Also:
    Constant Field Values

### VK_0

    public static final int VK_0

  VK_0 thru VK_9 are the same as ASCII '0' thru '9' (0x30 - 0x39)

  See Also:
    Constant Field Values

### VK_1

    public static final int VK_1

See Also:
  Constant Field Values

### VK_2

    public static final int VK_2

See Also:
  Constant Field Values

### VK_3

    public static final int VK_3

See Also:
  Constant Field Values

### VK_4

    public static final int VK_4

See Also:
  Constant Field Values

### VK_5

    public static final int VK_5

See Also:
  Constant Field Values

### VK_6

    public static final int VK_6

See Also:
  Constant Field Values

### VK_7

    public static final int VK_7

See Also:
  Constant Field Values

### VK_8

    public static final int VK_8

See Also:
  Constant Field Values

### VK_9

    public static final int VK_9

See Also:
  Constant Field Values

### VK_SEMICOLON

    public static final int VK_SEMICOLON

  Constant for the semicolon key, ";"

  See Also:
    Constant Field Values

### VK_EQUALS

    public static final int VK_EQUALS

  Constant for the equals key, "="

  See Also:
    Constant Field Values

### VK_A

    public static final int VK_A

  VK_A thru VK_Z are the same as ASCII 'A' thru 'Z' (0x41 - 0x5A)

  See Also:
    Constant Field Values

### VK_B

    public static final int VK_B

See Also:
  Constant Field Values

### VK_C

    public static final int VK_C

See Also:
  Constant Field Values

### VK_D

    public static final int VK_D

See Also:
  Constant Field Values

### VK_E

    public static final int VK_E

See Also:
  Constant Field Values

### VK_F

    public static final int VK_F

See Also:
  Constant Field Values

### VK_G

    public static final int VK_G

See Also:
  Constant Field Values

### VK_H

    public static final int VK_H

See Also:
  Constant Field Values

### VK_I

    public static final int VK_I

See Also:
  Constant Field Values

### VK_J

    public static final int VK_J

See Also:
  Constant Field Values

### VK_K

    public static final int VK_K

See Also:
  Constant Field Values

### VK_L

    public static final int VK_L

See Also:
  Constant Field Values

### VK_M

    public static final int VK_M

See Also:
  Constant Field Values

### VK_N

    public static final int VK_N

See Also:
  Constant Field Values

### VK_O

    public static final int VK_O

See Also:
  Constant Field Values

### VK_P

    public static final int VK_P

See Also:
  Constant Field Values

### VK_Q

    public static final int VK_Q

See Also:
  Constant Field Values

### VK_R

    public static final int VK_R

See Also:
  Constant Field Values

### VK_S

    public static final int VK_S

See Also:
  Constant Field Values

### VK_T

    public static final int VK_T

See Also:
  Constant Field Values

### VK_U

    public static final int VK_U

See Also:
  Constant Field Values

### VK_V

    public static final int VK_V

See Also:
  Constant Field Values

### VK_W

    public static final int VK_W

See Also:
  Constant Field Values

### VK_X

    public static final int VK_X

See Also:
  Constant Field Values

### VK_Y

    public static final int VK_Y

See Also:
  Constant Field Values

### VK_Z

    public static final int VK_Z

See Also:
  Constant Field Values

### VK_OPEN_BRACKET

    public static final int VK_OPEN_BRACKET

  Constant for the open bracket key, "["

  See Also:
    Constant Field Values

### VK_BACK_SLASH

    public static final int VK_BACK_SLASH

  Constant for the back slash key, "\"

  See Also:
    Constant Field Values

### VK_CLOSE_BRACKET

    public static final int VK_CLOSE_BRACKET

  Constant for the close bracket key, "]"

  See Also:
    Constant Field Values

### VK_NUMPAD0

    public static final int VK_NUMPAD0

See Also:
  Constant Field Values

### VK_NUMPAD1

    public static final int VK_NUMPAD1

See Also:
  Constant Field Values

### VK_NUMPAD2

    public static final int VK_NUMPAD2

See Also:
  Constant Field Values

### VK_NUMPAD3

    public static final int VK_NUMPAD3

See Also:
  Constant Field Values

### VK_NUMPAD4

    public static final int VK_NUMPAD4

See Also:
  Constant Field Values

### VK_NUMPAD5

    public static final int VK_NUMPAD5

See Also:
  Constant Field Values

### VK_NUMPAD6

    public static final int VK_NUMPAD6

See Also:
  Constant Field Values

### VK_NUMPAD7

    public static final int VK_NUMPAD7

See Also:
  Constant Field Values

### VK_NUMPAD8

    public static final int VK_NUMPAD8

See Also:
  Constant Field Values

### VK_NUMPAD9

    public static final int VK_NUMPAD9

See Also:
  Constant Field Values

### VK_MULTIPLY

    public static final int VK_MULTIPLY

See Also:
  Constant Field Values

### VK_ADD

    public static final int VK_ADD

See Also:
  Constant Field Values

### VK_SEPARATER

    public static final int VK_SEPARATER

  This constant is obsolete, and is included only for backwards compatibility.

  See Also:
    `VK_SEPARATOR`, Constant Field Values

### VK_SEPARATOR

    public static final int VK_SEPARATOR

  Constant for the Numpad Separator key.

  Since:
    1.4
  See Also:
    Constant Field Values

### VK_SUBTRACT

    public static final int VK_SUBTRACT

See Also:
  Constant Field Values

### VK_DECIMAL

    public static final int VK_DECIMAL

See Also:
  Constant Field Values

### VK_DIVIDE

    public static final int VK_DIVIDE

See Also:
  Constant Field Values

### VK_DELETE

    public static final int VK_DELETE

See Also:
  Constant Field Values

### VK_NUM_LOCK

    public static final int VK_NUM_LOCK

See Also:
  Constant Field Values

### VK_SCROLL_LOCK

    public static final int VK_SCROLL_LOCK

See Also:
  Constant Field Values

### VK_F1

    public static final int VK_F1

  Constant for the F1 function key.

  See Also:
    Constant Field Values

### VK_F2

    public static final int VK_F2

  Constant for the F2 function key.

  See Also:
    Constant Field Values

### VK_F3

    public static final int VK_F3

  Constant for the F3 function key.

  See Also:
    Constant Field Values

### VK_F4

    public static final int VK_F4

  Constant for the F4 function key.

  See Also:
    Constant Field Values

### VK_F5

    public static final int VK_F5

  Constant for the F5 function key.

  See Also:
    Constant Field Values

### VK_F6

    public static final int VK_F6

  Constant for the F6 function key.

  See Also:
    Constant Field Values

### VK_F7

    public static final int VK_F7

  Constant for the F7 function key.

  See Also:
    Constant Field Values

### VK_F8

    public static final int VK_F8

  Constant for the F8 function key.

  See Also:
    Constant Field Values

### VK_F9

    public static final int VK_F9

  Constant for the F9 function key.

  See Also:
    Constant Field Values

### VK_F10

    public static final int VK_F10

  Constant for the F10 function key.

  See Also:
    Constant Field Values

### VK_F11

    public static final int VK_F11

  Constant for the F11 function key.

  See Also:
    Constant Field Values

### VK_F12

    public static final int VK_F12

  Constant for the F12 function key.

  See Also:
    Constant Field Values

### VK_F13

    public static final int VK_F13

  Constant for the F13 function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_F14

    public static final int VK_F14

  Constant for the F14 function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_F15

    public static final int VK_F15

  Constant for the F15 function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_F16

    public static final int VK_F16

  Constant for the F16 function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_F17

    public static final int VK_F17

  Constant for the F17 function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_F18

    public static final int VK_F18

  Constant for the F18 function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_F19

    public static final int VK_F19

  Constant for the F19 function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_F20

    public static final int VK_F20

  Constant for the F20 function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_F21

    public static final int VK_F21

  Constant for the F21 function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_F22

    public static final int VK_F22

  Constant for the F22 function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_F23

    public static final int VK_F23

  Constant for the F23 function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_F24

    public static final int VK_F24

  Constant for the F24 function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_PRINTSCREEN

    public static final int VK_PRINTSCREEN

See Also:
  Constant Field Values

### VK_INSERT

    public static final int VK_INSERT

See Also:
  Constant Field Values

### VK_HELP

    public static final int VK_HELP

See Also:
  Constant Field Values

### VK_META

    public static final int VK_META

See Also:
  Constant Field Values

### VK_BACK_QUOTE

    public static final int VK_BACK_QUOTE

See Also:
  Constant Field Values

### VK_QUOTE

    public static final int VK_QUOTE

See Also:
  Constant Field Values

### VK_KP_UP

    public static final int VK_KP_UP

  Constant for the numeric keypad up arrow key.

  Since:
    1.2
  See Also:
    `VK_UP`, Constant Field Values

### VK_KP_DOWN

    public static final int VK_KP_DOWN

  Constant for the numeric keypad down arrow key.

  Since:
    1.2
  See Also:
    `VK_DOWN`, Constant Field Values

### VK_KP_LEFT

    public static final int VK_KP_LEFT

  Constant for the numeric keypad left arrow key.

  Since:
    1.2
  See Also:
    `VK_LEFT`, Constant Field Values

### VK_KP_RIGHT

    public static final int VK_KP_RIGHT

  Constant for the numeric keypad right arrow key.

  Since:
    1.2
  See Also:
    `VK_RIGHT`, Constant Field Values

### VK_DEAD_GRAVE

    public static final int VK_DEAD_GRAVE

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_ACUTE

    public static final int VK_DEAD_ACUTE

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_CIRCUMFLEX

    public static final int VK_DEAD_CIRCUMFLEX

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_TILDE

    public static final int VK_DEAD_TILDE

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_MACRON

    public static final int VK_DEAD_MACRON

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_BREVE

    public static final int VK_DEAD_BREVE

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_ABOVEDOT

    public static final int VK_DEAD_ABOVEDOT

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_DIAERESIS

    public static final int VK_DEAD_DIAERESIS

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_ABOVERING

    public static final int VK_DEAD_ABOVERING

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_DOUBLEACUTE

    public static final int VK_DEAD_DOUBLEACUTE

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_CARON

    public static final int VK_DEAD_CARON

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_CEDILLA

    public static final int VK_DEAD_CEDILLA

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_OGONEK

    public static final int VK_DEAD_OGONEK

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_IOTA

    public static final int VK_DEAD_IOTA

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_VOICED_SOUND

    public static final int VK_DEAD_VOICED_SOUND

Since:
  1.2
See Also:
  Constant Field Values

### VK_DEAD_SEMIVOICED_SOUND

    public static final int VK_DEAD_SEMIVOICED_SOUND

Since:
  1.2
See Also:
  Constant Field Values

### VK_AMPERSAND

    public static final int VK_AMPERSAND

Since:
  1.2
See Also:
  Constant Field Values

### VK_ASTERISK

    public static final int VK_ASTERISK

Since:
  1.2
See Also:
  Constant Field Values

### VK_QUOTEDBL

    public static final int VK_QUOTEDBL

Since:
  1.2
See Also:
  Constant Field Values

### VK_LESS

    public static final int VK_LESS

Since:
  1.2
See Also:
  Constant Field Values

### VK_GREATER

    public static final int VK_GREATER

Since:
  1.2
See Also:
  Constant Field Values

### VK_BRACELEFT

    public static final int VK_BRACELEFT

Since:
  1.2
See Also:
  Constant Field Values

### VK_BRACERIGHT

    public static final int VK_BRACERIGHT

Since:
  1.2
See Also:
  Constant Field Values

### VK_AT

    public static final int VK_AT

  Constant for the "@" key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_COLON

    public static final int VK_COLON

  Constant for the ":" key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_CIRCUMFLEX

    public static final int VK_CIRCUMFLEX

  Constant for the "^" key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_DOLLAR

    public static final int VK_DOLLAR

  Constant for the "$" key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_EURO_SIGN

    public static final int VK_EURO_SIGN

  Constant for the Euro currency sign key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_EXCLAMATION_MARK

    public static final int VK_EXCLAMATION_MARK

  Constant for the "!" key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_INVERTED_EXCLAMATION_MARK

    public static final int VK_INVERTED_EXCLAMATION_MARK

  Constant for the inverted exclamation mark key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_LEFT_PARENTHESIS

    public static final int VK_LEFT_PARENTHESIS

  Constant for the "(" key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_NUMBER_SIGN

    public static final int VK_NUMBER_SIGN

  Constant for the "#" key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_PLUS

    public static final int VK_PLUS

  Constant for the "+" key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_RIGHT_PARENTHESIS

    public static final int VK_RIGHT_PARENTHESIS

  Constant for the ")" key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_UNDERSCORE

    public static final int VK_UNDERSCORE

  Constant for the "_" key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_WINDOWS

    public static final int VK_WINDOWS

  Constant for the Microsoft Windows "Windows" key. It is used for both the left and right version of the key.

  Since:
    1.5
  See Also:
    `getKeyLocation()`, Constant Field Values

### VK_CONTEXT_MENU

    public static final int VK_CONTEXT_MENU

  Constant for the Microsoft Windows Context Menu key.

  Since:
    1.5
  See Also:
    Constant Field Values

### VK_FINAL

    public static final int VK_FINAL

See Also:
  Constant Field Values

### VK_CONVERT

    public static final int VK_CONVERT

  Constant for the Convert function key.

  See Also:
    Constant Field Values

### VK_NONCONVERT

    public static final int VK_NONCONVERT

  Constant for the Don't Convert function key.

  See Also:
    Constant Field Values

### VK_ACCEPT

    public static final int VK_ACCEPT

  Constant for the Accept or Commit function key.

  See Also:
    Constant Field Values

### VK_MODECHANGE

    public static final int VK_MODECHANGE

See Also:
  Constant Field Values

### VK_KANA

    public static final int VK_KANA

See Also:
  Constant Field Values

### VK_KANJI

    public static final int VK_KANJI

See Also:
  Constant Field Values

### VK_ALPHANUMERIC

    public static final int VK_ALPHANUMERIC

  Constant for the Alphanumeric function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_KATAKANA

    public static final int VK_KATAKANA

  Constant for the Katakana function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_HIRAGANA

    public static final int VK_HIRAGANA

  Constant for the Hiragana function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_FULL_WIDTH

    public static final int VK_FULL_WIDTH

  Constant for the Full-Width Characters function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_HALF_WIDTH

    public static final int VK_HALF_WIDTH

  Constant for the Half-Width Characters function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_ROMAN_CHARACTERS

    public static final int VK_ROMAN_CHARACTERS

  Constant for the Roman Characters function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_ALL_CANDIDATES

    public static final int VK_ALL_CANDIDATES

  Constant for the All Candidates function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_PREVIOUS_CANDIDATE

    public static final int VK_PREVIOUS_CANDIDATE

  Constant for the Previous Candidate function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_CODE_INPUT

    public static final int VK_CODE_INPUT

  Constant for the Code Input function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_JAPANESE_KATAKANA

    public static final int VK_JAPANESE_KATAKANA

  Constant for the Japanese-Katakana function key. This key switches to a Japanese input method and selects its Katakana input mode.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_JAPANESE_HIRAGANA

    public static final int VK_JAPANESE_HIRAGANA

  Constant for the Japanese-Hiragana function key. This key switches to a Japanese input method and selects its Hiragana input mode.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_JAPANESE_ROMAN

    public static final int VK_JAPANESE_ROMAN

  Constant for the Japanese-Roman function key. This key switches to a Japanese input method and selects its Roman-Direct input mode.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_KANA_LOCK

    public static final int VK_KANA_LOCK

  Constant for the locking Kana function key. This key locks the keyboard into a Kana layout.

  Since:
    1.3
  See Also:
    Constant Field Values

### VK_INPUT_METHOD_ON_OFF

    public static final int VK_INPUT_METHOD_ON_OFF

  Constant for the input method on/off key.

  Since:
    1.3
  See Also:
    Constant Field Values

### VK_CUT

    public static final int VK_CUT

Since:
  1.2
See Also:
  Constant Field Values

### VK_COPY

    public static final int VK_COPY

Since:
  1.2
See Also:
  Constant Field Values

### VK_PASTE

    public static final int VK_PASTE

Since:
  1.2
See Also:
  Constant Field Values

### VK_UNDO

    public static final int VK_UNDO

Since:
  1.2
See Also:
  Constant Field Values

### VK_AGAIN

    public static final int VK_AGAIN

Since:
  1.2
See Also:
  Constant Field Values

### VK_FIND

    public static final int VK_FIND

Since:
  1.2
See Also:
  Constant Field Values

### VK_PROPS

    public static final int VK_PROPS

Since:
  1.2
See Also:
  Constant Field Values

### VK_STOP

    public static final int VK_STOP

Since:
  1.2
See Also:
  Constant Field Values

### VK_COMPOSE

    public static final int VK_COMPOSE

  Constant for the Compose function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_ALT_GRAPH

    public static final int VK_ALT_GRAPH

  Constant for the AltGraph function key.

  Since:
    1.2
  See Also:
    Constant Field Values

### VK_BEGIN

    public static final int VK_BEGIN

  Constant for the Begin key.

  Since:
    1.5
  See Also:
    Constant Field Values

### VK_UNDEFINED

    public static final int VK_UNDEFINED

  This value is used to indicate that the keyCode is unknown. KEY_TYPED events do not have a keyCode value; this value is used instead.

  See Also:
    Constant Field Values

### CHAR_UNDEFINED

    public static final char CHAR_UNDEFINED

  KEY_PRESSED and KEY_RELEASED events which do not map to a valid Unicode character use this for the keyChar value.

  See Also:
    Constant Field Values

### KEY_LOCATION_UNKNOWN

    public static final int KEY_LOCATION_UNKNOWN

  A constant indicating that the keyLocation is indeterminate or not relevant. `KEY_TYPED` events do not have a keyLocation; this value is used instead.

  Since:
    1.4
  See Also:
    Constant Field Values

### KEY_LOCATION_STANDARD

    public static final int KEY_LOCATION_STANDARD

  A constant indicating that the key pressed or released is not distinguished as the left or right version of a key, and did not originate on the numeric keypad (or did not originate with a virtual key corresponding to the numeric keypad).

  Since:
    1.4
  See Also:
    Constant Field Values

### KEY_LOCATION_LEFT

    public static final int KEY_LOCATION_LEFT

  A constant indicating that the key pressed or released is in the left key location (there is more than one possible location for this key). Example: the left shift key.

  Since:
    1.4
  See Also:
    Constant Field Values

### KEY_LOCATION_RIGHT

    public static final int KEY_LOCATION_RIGHT

  A constant indicating that the key pressed or released is in the right key location (there is more than one possible location for this key). Example: the right shift key.

  Since:
    1.4
  See Also:
    Constant Field Values

### KEY_LOCATION_NUMPAD

    public static final int KEY_LOCATION_NUMPAD

  A constant indicating that the key event originated on the numeric keypad or with a virtual key corresponding to the numeric keypad.

  Since:
    1.4
  See Also:
    Constant Field Values

Constructor Detail

### KeyEvent

    public KeyEvent(Component source,
                    int id,
                    long when,
                    int modifiers,
                    int keyCode,
                    char keyChar,
                    int keyLocation)

### KeyEvent

    public KeyEvent(Component source,
                    int id,
                    long when,
                    int modifiers,
                    int keyCode,
                    char keyChar)

  Constructs a `KeyEvent` object.

  Note that passing in an invalid `id` results in unspecified behavior. This method throws an `IllegalArgumentException` if `source` is `null`.

  Parameters:
    `source` - the `Component` that originated the event
    `id` - an integer identifying the type of event
    `when` - a long integer that specifies the time the event occurred
    `modifiers` - the modifier keys down during event (shift, ctrl, alt, meta) Either extended _DOWN_MASK or old _MASK modifiers should be used, but both models should not be mixed in one event. Use of the extended modifiers is preferred.
    `keyCode` - the integer code for an actual key, or VK_UNDEFINED (for a key-typed event)
    `keyChar` - the Unicode character generated by this event, or CHAR_UNDEFINED (for key-pressed and key-released events which do not map to a valid Unicode character)
  Throws:
    `IllegalArgumentException` - if `id` is `KEY_TYPED` and `keyChar` is `CHAR_UNDEFINED`; or if `id` is `KEY_TYPED` and `keyCode` is not `VK_UNDEFINED`
    `IllegalArgumentException` - if `source` is null

### KeyEvent

    @Deprecated
    public KeyEvent(Component source,
                               int id,
                               long when,
                               int modifiers,
                               int keyCode)

  Deprecated. as of JDK1.1

Method Detail

### getKeyCode

    public int getKeyCode()

  Returns the integer keyCode associated with the key in this event.

  Returns:
    the integer code for an actual key on the keyboard. (For `KEY_TYPED` events, the keyCode is `VK_UNDEFINED`.)

### setKeyCode

    public void setKeyCode(int keyCode)

  Set the keyCode value to indicate a physical key.

  Parameters:
    `keyCode` - an integer corresponding to an actual key on the keyboard.

### getKeyChar

    public char getKeyChar()

  Returns the character associated with the key in this event. For example, the `KEY_TYPED` event for shift + "a" returns the value for "A".

  `KEY_PRESSED` and `KEY_RELEASED` events are not intended for reporting of character input. Therefore, the values returned by this method are guaranteed to be meaningful only for `KEY_TYPED` events.

  Returns:
    the Unicode character defined for this key event. If no valid Unicode character exists for this key event, `CHAR_UNDEFINED` is returned.

### setKeyChar

    public void setKeyChar(char keyChar)

  Set the keyChar value to indicate a logical character.

  Parameters:
    `keyChar` - a char corresponding to to the combination of keystrokes that make up this event.

### setModifiers

    @Deprecated
    public void setModifiers(int modifiers)

  Deprecated. as of JDK1.1.4

  Set the modifiers to indicate additional keys that were held down (e.g. shift, ctrl, alt, meta) defined as part of InputEvent.

  NOTE: use of this method is not recommended, because many AWT implementations do not recognize modifier changes. This is especially true for `KEY_TYPED` events where the shift modifier is changed.

  Parameters:
    `modifiers` - an integer combination of the modifier constants.
  See Also:
    `InputEvent`

### getKeyLocation

    public int getKeyLocation()

  Returns the location of the key that originated this key event. Some keys occur more than once on a keyboard, e.g. the left and right shift keys. Additionally, some keys occur on the numeric keypad. This provides a way of distinguishing such keys.

  Returns:
    the location of the key that was pressed or released. Always returns `KEY_LOCATION_UNKNOWN` for `KEY_TYPED` events.
  Since:
    1.4

### getKeyText

    public static String getKeyText(int keyCode)

  Returns a String describing the keyCode, such as "HOME", "F1" or "A". These strings can be localized by changing the awt.properties file.

  Returns:
    a string containing a text description for a physical key, identified by its keyCode

### getKeyModifiersText

    public static String getKeyModifiersText(int modifiers)

  Returns a `String` describing the modifier key(s), such as "Shift", or "Ctrl+Shift". These strings can be localized by changing the `awt.properties` file.

  Note that `InputEvent.ALT_MASK` and `InputEvent.BUTTON2_MASK` have the same value, so the string "Alt" is returned for both modifiers. Likewise, `InputEvent.META_MASK` and `InputEvent.BUTTON3_MASK` have the same value, so the string "Meta" is returned for both modifiers.

  Returns:
    string a text description of the combination of modifier keys that were held down during the event
  See Also:
    `InputEvent.getModifiersExText(int)`

### isActionKey

    public boolean isActionKey()

  Returns whether the key in this event is an "action" key. Typically an action key does not fire a unicode character and is not a modifier key.

  Returns:
    `true` if the key is an "action" key, `false` otherwise

### paramString

    public String paramString()

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

  Overrides:
    `paramString` in class `ComponentEvent`
  Returns:
    a string identifying the event and its attributes

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