In this section, you will learn about handling the focus changes in java. This section shows you how the event be handled according to the focuses and to find out whether the component got the focus or lost the focus.
This program determines the focus changes events. You can set the different-different events for the focused of the several components particularly. The generated focus events are performed by the FocusListener of the object used in your application using the addFocusListener() method. The generated event (FocusEvent) is passed to every FocusListener objects that receives such types of events using the addFocusListener() method of the object. The addFocusListener() method is takes the instance of MyFcousListener class.
This is the inner class used in the FocusChange class in which, the focusGained() method has been used to receive the generated event. This method sets the text of the source of the event to the label component. This program displays the three command buttons on the frame. If you select any button of those then the text of that button will be shown on the label.
This is the abstract class is used to receive the keyboard focus event.
Here is the code of program:
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Posted on: April 17, 2007 If you enjoyed this post then why not add us on Google+? Add us to your Circles