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Create a Simple Push Button
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Classes and Interfaces javaawteventActionEvent javaawteventActionListener javaxswingJButton Methods String getActionCommand( ) void actionPerformed(ActionEvent ae) void addActionListener(ActionListener al) void setEnabled(boolean state) boolean isEnabled( )
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Perhaps the most commonly used GUI control is the push button A push button is an instance of JButton JButton inherits the abstract class AbstractButton, which defines the functionality common to all buttons The model used by JButton is ButtonModel
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Swing push buttons support a rich array of functionality Here are a few examples A JButton can contain text, an image, or both The button can be enabled or disabled under program control The icon can change dynamically based on the state of the button For instance, the button can display one icon when the button is rolled over by the mouse and another when it is pressed or when it is disabled Because of the importance of buttons, two recipes are used to describe them This recipe shows how to create and manage a basic button The following recipe shows how to add icons, use HTML, and define a default button
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To create and manage a push button involves these steps: 1 Create an instance of JButton 2 Define an ActionListener for the button This listener will handle button-press events in its actionPerformed( ) method 3 Add the ActionListener instance to the button by calling addActionListener( ) 4 One way to identify which button has generated an ActionEvent is to call getActionCommand( ) It returns the action command string associated with the button 5 To disable or enable a button, call setEnabled( ) 6 To determine if a button is enabled or disabled, call isEnabled( )
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To create a push button, create an instance of JButton It defines several constructors The one used here is: JButton(String msg) Here, msg specifies the message displayed inside the button When a push button is pressed, it generates an ActionEvent, which is packaged in javaawtevent To listen for this event, you must first create an implementation of the ActionListener interface (also packaged in javaawtevent) and then register this listener with the button After doing so, the registered listener is passed an ActionEvent each time the button is pressed The ActionListener interface defines only one method: actionPerformed( ) It is shown here: void actionPerformed(ActionEvent ae) This method is called when a button is pressed In other words, it is the event handler for button presses To register an action listener for a button, use the addActionListener( ) method provided by JButton It is shown here: void addActionListener(ActionListener al) The object passed in al will receive event notifications This object must be an instance of a class that implements the ActionListener interface as just described
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8:
Swing
Using the ActionEvent object passed to actionPerformed( ), you can obtain several useful pieces of information relating to the button-press event The one used by this recipe is the action command string associated with the button All push buttons have an action command string associated with them By default, this is the string displayed inside the button The action command string is obtained by calling getActionCommand( ) on the event object It is declared like this: String getActionCommand( ) When using two or more buttons within the same application, the action command string gives you an easy way to identify which button generated the event In other words, you can use the action command string to determine which button was pressed You can disable or enable a button under program control by calling setEnabled( ) It is shown here: void setEnabled(Boolean state) If state is false, the button is disabled This means that the button cannot be pressed and is shown in gray If state is true, the button is enabled To determine the enabled/disabled state of a button, call isEnabled( ): boolean isEnabled( ) It returns true if the button is enabled and false if it is disabled
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