Java Event Classes

Java Event Classes

The literal term of the word ‘event’ signifies a particular action that triggers some response.  Such an action brings about a change in the current scenario of things. In Java as well, an event is defined as the process which brings about a change in the state of an object. Some of the most common events in Java are clicking of a button or dragging the mouse cursor to perform some action. Every event is thereafter followed by a Listener interface which performs an action in response to the event. The java.awt.event package provides several event classes and listener interfaces that can be used to perform event handling.

Java Event Classes and Listener Interfaces

Event Classes Listener Interfaces
ActionEvent ActionListener
MouseEvent MouseListener and MouseMotionListener
MouseWheelEvent MouseWheelListener
KeyEvent KeyListener
ItemEvent ItemListener
TextEvent TextListener
AdjustmentEvent AdjustmentListener
WindowEvent WindowListener
ComponentEvent ComponentListener
ContainerEvent ContainerListener
FocusEvent FocusListener

 

Steps to Perform Event Handling

To be able to handle a Java event successfully, the following step have to be carried out:

The primary requirement is to register the event component of your code with a Listener such that your program knows how to respond to an event.

Registration Methods

  • Button – public void addActionListener (ActionListener a) {}
  • MenuItem – public void addActionListener (ActionListener a) {}
  • TextField – public void addActionListener (ActionListener a) {}
  • TextField – public void addTextListener (TextListener a) {}
  • TextArea – public void addTextListener (TextListener a) {}
  • Checkbox – public void addItemListener (ItemListener a) {}
  • Choice – public void addItemListener (ItemListener a) {}
  • List – public void addActionListener (ActionListener a) {}
  • List – public void addItemListener (ItemListener a) {}

 

Author

  • Barry Allen

    A Full Stack Developer with 10+ years of experience in different domain including SAP, Blockchain, AI and Web Development.

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