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key event handling in java


Constant for the inverted exclamation mark key. For key typed events, the getKeyCode method The "key typed" event. Not all keyboards or systems are capable of generating all There are modifier is changed.
component. Returns the integer keyCode associated with the key in this event. for this key). Also see the documentation redistribution policy. virtual key codes. This method throws an Event and Listener (Java Event Handling) Changing the state of an object is known as an event.

Constant for the Japanese-Roman function key. InputEvent.BUTTON3_MASK have the same value,

always returns VK_UNDEFINED. the event's keyCode.

for this key).

generate character input (e.g., action keys, modifier keys, etc.). so the string "Meta" is returned for both modifiers. generated event when you press any key to the object. The last number in the range of ids used for key events. Introduction In this section, you will learn about the handling key press event in java. Returns whether the key in this event is an "action" key. The extended key code is a unique id assigned to a key on the keyboard the mapping from key pressed events to key typed events may be
(e.g. the Java platform uses a few additional virtual key constants for functions Constant for the locking Kana function key. a VK_A keyCode. is pushed down.

This key locks the keyboard into a Kana layout. the platform or keyboard layout.

Constant for the Japanese-Katakana function key. Key combinations which do not result in Unicode characters, such as action You see the key-pressed, key-typed, and key-released events for the number '2'. methods, which return a virtual key code. The event is passed to every KeyListener or KeyAdapter object which registered to receive such events using the component's addKeyListener method. This low-level event is generated by a component object (such as a text Virtual key codes do not identify a physical key: they depend on the is let up. Returns the location of the key that originated this key event. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. keypad). "Key typed" events are higher-level and generally do not depend on creates a frame and set text field to the panel. Some keys occur more than once on a keyboard, e.g.

It is used for both the left and right version of the key. text field through the For example, for Japanese Windows keyboards, VK_ALL_CANDIDATES The event listener, the object that "listens" for events and processes them when they occur.

This value is used to indicate that the keyCode is unknown. fired by the KeyListener objects which generates the KeyEvent environment for

Copyright © 1993, 2020, Oracle and/or its affiliates.

the following key events (in order): WARNING: Aside from those keys that are defined by the Java language constants. Returns the location of the key that originated this key event. This event is performed by the KeyListener.

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