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The majority of the events are self-explanatory and are related to the operation of the mouse and mouse-pointer The method which most often causes confusion is action(), which is invoked by the Java system when a user interface element is manipulated The reason that confusion arises is that if the event handling is implemented within an instance of the Frame class which is parenting several user interface components, then all events caused by all of the components are sent to the action() method in the Frame It is then the responsibility of this method to determine which component has sent the event and deal with the event accordingly Of course, it is possible to have each user interface component handle events directly, but since a subclass of each class must be created for every type of element that handles events differently, the class hierarchy can soon become huge and difficult to maintain In the next section we will illustrate a simple solution to this problem Handling events using the action() method The approach that we use is to break the event down into the type of element that sent the event and then process the specific event to determine which element of that type was responsible This approach provides a reasonable and flexible approach to coding the method It etains event control in a high-level window, without pushing the code down to the subclasses and bloating the class hierarchy with large numbers of classes which exist only to handle events; this is more an issue when writing an interface for an applet, where each class must be separately loaded over the network a situation where a large number of classes can significantly delay the loading and execution of your code We have written a simple applet with an interface similar to the one in the examples so far in this section The code looks like this: import javaappletApplet; import javaawt*;. vb.net read pdf file Read and Extract PDF Text from C# / VB . 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