On entering the character the Key event is generated.There are three types of key events which are represented by the integer constants. These key events are following

  • KEY_PRESSED

  • KEY_RELASED

  • KEY_TYPED

Class declaration

Following is the declaration for java.awt.event.KeyEvent class:

  1. public class KeyEvent
  2. extends InputEvent

Field

Following are the fields for java.awt.InputEvent class:

  • 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

Class constructors

S.N.Constructor & Description
1 KeyEvent(Component source, int id, long when, int modifiers, int keyCode) Deprecated. as of JDK1.1
2 KeyEvent(Component source, int id, long when, int modifiers, int keyCode, char keyChar) Constructs a KeyEvent object.
3 KeyEvent(Component source, int id, long when, int modifiers, int keyCode, char keyChar, int keyLocation)

Class methods

S.N.Method & Description
1 char getKeyChar() Returns the character associated with the key in this event.
2 intgetKeyCode() Returns the integer keyCode associated with the key in this event.
3 intgetKeyLocation() Returns the location of the key that originated this key event.
4 static String getKeyModifiersText(int modifiers) Returns a String describing the modifier key(s), such as "Shift", or "Ctrl+Shift".
5 static String getKeyText(int keyCode) Returns a String describing the keyCode, such as "HOME", "F1" or "A".
6 booleanisActionKey() Returns whether the key in this event is an "action" key.
7 String paramString() Returns a parameter string identifying this event.
8 void setKeyChar(char keyChar) Set the keyChar value to indicate a logical character.
9 void setKeyCode(int keyCode) Set the keyCode value to indicate a physical key.
10 void setModifiers(int modifiers) Deprecated. as of JDK1.1.4

Methods inherited

This class inherits methods from the following classes:

  • java.awt.event.InputEvent

  • java.awt.event.ComponentEvent

  • java.awt.AWTEvent

  • java.util.EventObject

  • java.lang.Object