AWTKeyStroke

java.lang.Object
- java.awt.AWTKeyStroke

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

KeyStroke
```
public class AWTKeyStroke
extends Object
implements Serializable
```
An AWTKeyStroke represents a key action on the keyboard, or equivalent input device. AWTKeyStrokes can correspond to only a press or release of a particular key, just as KEY_PRESSED and KEY_RELEASED KeyEvents do; alternately, they can correspond to typing a specific Java character, just as KEY_TYPED KeyEvents do. In all cases, AWTKeyStrokes can specify modifiers (alt, shift, control, meta, altGraph, or a combination thereof) which must be present during the action for an exact match.
AWTKeyStrokes are immutable, and are intended to be unique. Client code should never create an AWTKeyStroke on its own, but should instead use a variant of getAWTKeyStroke. Client use of these factory methods allows the AWTKeyStroke implementation to cache and share instances efficiently.

Since:

1.4

See Also:

getAWTKeyStroke(char), Serialized Form

Constructor Summary

Constructors

Modifier	Constructor and Description
`protected`	`AWTKeyStroke()` Constructs an `AWTKeyStroke` with default values.
`protected`	`AWTKeyStroke(char keyChar, int keyCode, int modifiers, boolean onKeyRelease)` Constructs an `AWTKeyStroke` with the specified values.

Method Summary

All Methods

Static Methods

Instance Methods

Concrete Methods
Modifier and Type	Method and Description
`boolean`	`equals(Object anObject)` Returns true if this object is identical to the specified object.
`static AWTKeyStroke`	`getAWTKeyStroke(char keyChar)` Returns a shared instance of an `AWTKeyStroke` that represents a `KEY_TYPED` event for the specified character.
`static AWTKeyStroke`	`getAWTKeyStroke(Character keyChar, int modifiers)` Returns a shared instance of an `AWTKeyStroke` that represents a `KEY_TYPED` event for the specified Character object and a set of modifiers.
`static AWTKeyStroke`	`getAWTKeyStroke(int keyCode, int modifiers)` Returns a shared instance of an `AWTKeyStroke`, given a numeric key code and a set of modifiers.
`static AWTKeyStroke`	`getAWTKeyStroke(int keyCode, int modifiers, boolean onKeyRelease)` Returns a shared instance of an `AWTKeyStroke`, given a numeric key code and a set of modifiers, specifying whether the key is activated when it is pressed or released.
`static AWTKeyStroke`	`getAWTKeyStroke(String s)` Parses a string and returns an `AWTKeyStroke`.
`static AWTKeyStroke`	`getAWTKeyStrokeForEvent(KeyEvent anEvent)` Returns an `AWTKeyStroke` which represents the stroke which generated a given `KeyEvent`.
`char`	`getKeyChar()` Returns the character for this `AWTKeyStroke`.
`int`	`getKeyCode()` Returns the numeric key code for this `AWTKeyStroke`.
`int`	`getKeyEventType()` Returns the type of `KeyEvent` which corresponds to this `AWTKeyStroke`.
`int`	`getModifiers()` Returns the modifier keys for this `AWTKeyStroke`.
`int`	`hashCode()` Returns a numeric value for this object that is likely to be unique, making it a good choice as the index value in a hash table.
`boolean`	`isOnKeyRelease()` Returns whether this `AWTKeyStroke` represents a key release.
`protected Object`	`readResolve()` Returns a cached instance of `AWTKeyStroke` (or a subclass of `AWTKeyStroke`) which is equal to this instance.
`protected static void`	`registerSubclass(Class<?> subclass)` Registers a new class which the factory methods in `AWTKeyStroke` will use when generating new instances of `AWTKeyStroke`s.
`String`	`toString()` Returns a string that displays and identifies this object's properties.

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

Constructor Detail

AWTKeyStroke

protected AWTKeyStroke()

Constructs an AWTKeyStroke with default values. The default values used are:

Property	Default Value
Key Char	`KeyEvent.CHAR_UNDEFINED`
Key Code	`KeyEvent.VK_UNDEFINED`
Modifiers	none
On key release?	`false`

AWTKeyStrokes should not be constructed by client code. Use a variant of getAWTKeyStroke instead.

See Also:: getAWTKeyStroke(char)

AWTKeyStroke
```
protected AWTKeyStroke(char keyChar,
                       int keyCode,
                       int modifiers,
                       boolean onKeyRelease)
```
Constructs an AWTKeyStroke with the specified values. AWTKeyStrokes should not be constructed by client code. Use a variant of getAWTKeyStroke instead.

Parameters:

keyChar - the character value for a keyboard key

keyCode - the key code for this AWTKeyStroke

modifiers - a bitwise-ored combination of any modifiers

onKeyRelease - true if this AWTKeyStroke corresponds to a key release; false otherwise

See Also:

getAWTKeyStroke(char)

Method Detail
- registerSubclass
```
protected static void registerSubclass(Class<?> subclass)
```
  Registers a new class which the factory methods in AWTKeyStroke will use when generating new instances of AWTKeyStrokes. After invoking this method, the factory methods will return instances of the specified Class. The specified Class must be either AWTKeyStroke or derived from AWTKeyStroke, and it must have a no-arg constructor. The constructor can be of any accessibility, including private. This operation flushes the current AWTKeyStroke cache.
  
  Parameters:
  
  subclass - the new Class of which the factory methods should create instances
  
  Throws:
  
  IllegalArgumentException - if subclass is null, or if subclass does not have a no-arg constructor
  
  ClassCastException - if subclass is not AWTKeyStroke, or a class derived from AWTKeyStroke
- getAWTKeyStroke
```
public static AWTKeyStroke getAWTKeyStroke(char keyChar)
```
  Returns a shared instance of an AWTKeyStroke that represents a KEY_TYPED event for the specified character.
  
  Parameters:
  
  keyChar - the character value for a keyboard key
  
  Returns:
  
  an AWTKeyStroke object for that key
- getAWTKeyStroke
```
public static AWTKeyStroke getAWTKeyStroke(Character keyChar,
                                           int modifiers)
```
  Returns a shared instance of an AWTKeyStroke that represents a KEY_TYPED event for the specified Character object and a set of modifiers. Note that the first parameter is of type Character rather than char. This is to avoid inadvertent clashes with calls to getAWTKeyStroke(int keyCode, int modifiers). The modifiers consist of any combination of following:
  - java.awt.event.InputEvent.SHIFT_DOWN_MASK
  - java.awt.event.InputEvent.CTRL_DOWN_MASK
  - java.awt.event.InputEvent.META_DOWN_MASK
  - java.awt.event.InputEvent.ALT_DOWN_MASK
  - java.awt.event.InputEvent.ALT_GRAPH_DOWN_MASK
  The old modifiers listed below also can be used, but they are mapped to _DOWN_ modifiers.
  - java.awt.event.InputEvent.SHIFT_MASK
  - java.awt.event.InputEvent.CTRL_MASK
  - java.awt.event.InputEvent.META_MASK
  - java.awt.event.InputEvent.ALT_MASK
  - java.awt.event.InputEvent.ALT_GRAPH_MASK
  also can be used, but they are mapped to _DOWN_ modifiers. Since these numbers are all different powers of two, any combination of them is an integer in which each bit represents a different modifier key. Use 0 to specify no modifiers.
  Parameters:
  
  keyChar - the Character object for a keyboard character
  
  modifiers - a bitwise-ored combination of any modifiers
  
  Returns:
  
  an AWTKeyStroke object for that key
  
  Throws:
  
  IllegalArgumentException - if keyChar is null
  
  See Also:
  
  InputEvent
- getAWTKeyStroke
```
public static AWTKeyStroke getAWTKeyStroke(int keyCode,
                                           int modifiers,
                                           boolean onKeyRelease)
```
  Returns a shared instance of an AWTKeyStroke, given a numeric key code and a set of modifiers, specifying whether the key is activated when it is pressed or released.
  The "virtual key" constants defined in java.awt.event.KeyEvent can be used to specify the key code. For example:
  - java.awt.event.KeyEvent.VK_ENTER
  - java.awt.event.KeyEvent.VK_TAB
  - java.awt.event.KeyEvent.VK_SPACE
  Alternatively, the key code may be obtained by calling java.awt.event.KeyEvent.getExtendedKeyCodeForChar. The modifiers consist of any combination of:
  - java.awt.event.InputEvent.SHIFT_DOWN_MASK
  - java.awt.event.InputEvent.CTRL_DOWN_MASK
  - java.awt.event.InputEvent.META_DOWN_MASK
  - java.awt.event.InputEvent.ALT_DOWN_MASK
  - java.awt.event.InputEvent.ALT_GRAPH_DOWN_MASK
  The old modifiers
  - java.awt.event.InputEvent.SHIFT_MASK
  - java.awt.event.InputEvent.CTRL_MASK
  - java.awt.event.InputEvent.META_MASK
  - java.awt.event.InputEvent.ALT_MASK
  - java.awt.event.InputEvent.ALT_GRAPH_MASK
  also can be used, but they are mapped to _DOWN_ modifiers. Since these numbers are all different powers of two, any combination of them is an integer in which each bit represents a different modifier key. Use 0 to specify no modifiers.
  Parameters:
  
  keyCode - an int specifying the numeric code for a keyboard key
  
  modifiers - a bitwise-ored combination of any modifiers
  
  onKeyRelease - true if the AWTKeyStroke should represent a key release; false otherwise
  
  Returns:
  
  an AWTKeyStroke object for that key
  
  See Also:
  
  KeyEvent, InputEvent
- getAWTKeyStroke
```
public static AWTKeyStroke getAWTKeyStroke(int keyCode,
                                           int modifiers)
```
  Returns a shared instance of an AWTKeyStroke, given a numeric key code and a set of modifiers. The returned AWTKeyStroke will correspond to a key press.
  The "virtual key" constants defined in java.awt.event.KeyEvent can be used to specify the key code. For example:
  - java.awt.event.KeyEvent.VK_ENTER
  - java.awt.event.KeyEvent.VK_TAB
  - java.awt.event.KeyEvent.VK_SPACE
  The modifiers consist of any combination of:
  - java.awt.event.InputEvent.SHIFT_DOWN_MASK
  - java.awt.event.InputEvent.CTRL_DOWN_MASK
  - java.awt.event.InputEvent.META_DOWN_MASK
  - java.awt.event.InputEvent.ALT_DOWN_MASK
  - java.awt.event.InputEvent.ALT_GRAPH_DOWN_MASK
  The old modifiers
  - java.awt.event.InputEvent.SHIFT_MASK
  - java.awt.event.InputEvent.CTRL_MASK
  - java.awt.event.InputEvent.META_MASK
  - java.awt.event.InputEvent.ALT_MASK
  - java.awt.event.InputEvent.ALT_GRAPH_MASK
  also can be used, but they are mapped to _DOWN_ modifiers. Since these numbers are all different powers of two, any combination of them is an integer in which each bit represents a different modifier key. Use 0 to specify no modifiers.
  Parameters:
  
  keyCode - an int specifying the numeric code for a keyboard key
  
  modifiers - a bitwise-ored combination of any modifiers
  
  Returns:
  
  an AWTKeyStroke object for that key
  
  See Also:
  
  KeyEvent, InputEvent
- getAWTKeyStrokeForEvent
```
public static AWTKeyStroke getAWTKeyStrokeForEvent(KeyEvent anEvent)
```
  Returns an AWTKeyStroke which represents the stroke which generated a given KeyEvent.
  This method obtains the keyChar from a KeyTyped event, and the keyCode from a KeyPressed or KeyReleased event. The KeyEvent modifiers are obtained for all three types of KeyEvent.
  
  Parameters:
  
  anEvent - the KeyEvent from which to obtain the AWTKeyStroke
  
  Returns:
  
  the AWTKeyStroke that precipitated the event
  
  Throws:
  
  NullPointerException - if anEvent is null
- getAWTKeyStroke
```
public static AWTKeyStroke getAWTKeyStroke(String s)
```
  Parses a string and returns an AWTKeyStroke. The string must have the following syntax:
```
    <modifiers>* (<typedID> | <pressedReleasedID>)

    modifiers := shift | control | ctrl | meta | alt | altGraph
    typedID := typed <typedKey>
    typedKey := string of length 1 giving Unicode character.
    pressedReleasedID := (pressed | released) key
    key := KeyEvent key code name, i.e. the name following "VK_".
 
```
  If typed, pressed or released is not specified, pressed is assumed. Here are some examples:
```
     "INSERT" => getAWTKeyStroke(KeyEvent.VK_INSERT, 0);
     "control DELETE" => getAWTKeyStroke(KeyEvent.VK_DELETE, InputEvent.CTRL_MASK);
     "alt shift X" => getAWTKeyStroke(KeyEvent.VK_X, InputEvent.ALT_MASK | InputEvent.SHIFT_MASK);
     "alt shift released X" => getAWTKeyStroke(KeyEvent.VK_X, InputEvent.ALT_MASK | InputEvent.SHIFT_MASK, true);
     "typed a" => getAWTKeyStroke('a');
 
```
  Parameters:
  
  s - a String formatted as described above
  
  Returns:
  
  an AWTKeyStroke object for that String
  
  Throws:
  
  IllegalArgumentException - if s is null, or is formatted incorrectly
- getKeyChar
```
public final char getKeyChar()
```
  Returns the character for this AWTKeyStroke.
  
  Returns:
  
  a char value
  
  See Also:
  
  getAWTKeyStroke(char), KeyEvent.getKeyChar()
- getKeyCode
```
public final int getKeyCode()
```
  Returns the numeric key code for this AWTKeyStroke.
  
  Returns:
  
  an int containing the key code value
  
  See Also:
  
  getAWTKeyStroke(int,int), KeyEvent.getKeyCode()
- getModifiers
```
public final int getModifiers()
```
  Returns the modifier keys for this AWTKeyStroke.
  
  Returns:
  
  an int containing the modifiers
  
  See Also:
  
  getAWTKeyStroke(int,int)
- isOnKeyRelease
```
public final boolean isOnKeyRelease()
```
  Returns whether this AWTKeyStroke represents a key release.
  
  Returns:
  
  true if this AWTKeyStroke represents a key release; false otherwise
  
  See Also:
  
  getAWTKeyStroke(int,int,boolean)
- getKeyEventType
```
public final int getKeyEventType()
```
  Returns the type of KeyEvent which corresponds to this AWTKeyStroke.
  
  Returns:
  
  KeyEvent.KEY_PRESSED, KeyEvent.KEY_TYPED, or KeyEvent.KEY_RELEASED
  
  See Also:
  
  KeyEvent
- hashCode
```
public int hashCode()
```
  Returns a numeric value for this object that is likely to be unique, making it a good choice as the index value in a hash table.
  
  Overrides:
  
  hashCode in class Object
  
  Returns:
  
  an int that represents this object
  
  See Also:
  
  Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
- equals
```
public final boolean equals(Object anObject)
```
  Returns true if this object is identical to the specified object.
  
  Overrides:
  
  equals in class Object
  
  Parameters:
  
  anObject - the Object to compare this object to
  
  Returns:
  
  true if the objects are identical
  
  See Also:
  
  Object.hashCode(), HashMap
- toString
```
public String toString()
```
  Returns a string that displays and identifies this object's properties. The String returned by this method can be passed as a parameter to getAWTKeyStroke(String) to produce a key stroke equal to this key stroke.
  
  Overrides:
  
  toString in class Object
  
  Returns:
  
  a String representation of this object
  
  See Also:
  
  getAWTKeyStroke(String)
- readResolve
```
protected Object readResolve()
                      throws ObjectStreamException
```
  Returns a cached instance of AWTKeyStroke (or a subclass of AWTKeyStroke) which is equal to this instance.
  
  Returns:
  
  a cached instance which is equal to this instance
  
  Throws:
  
  ObjectStreamException

Class AWTKeyStroke

Constructor Summary

Constructors

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

AWTKeyStroke

AWTKeyStroke

Method Detail

registerSubclass

getAWTKeyStroke

getAWTKeyStroke

getAWTKeyStroke

getAWTKeyStroke

getAWTKeyStrokeForEvent

getAWTKeyStroke

getKeyChar

getKeyCode

getModifiers

isOnKeyRelease

getKeyEventType

hashCode

equals

toString

readResolve