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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:

public class KeyEvent
   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	int getKeyCode()Returns the integer keyCode associated with the key in this event.
3	int getKeyLocation()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	boolean isActionKey()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