Adds the specified action listener to receive action events from this button. Action events occur when a user presses or releases the mouse over this button. If l is null, no exception is thrown and no action is performed.
Refer to AWT Threading Issues for details on AWT's threading model.
@param l the action listener
@see #removeActionListener
@see #getActionListeners
@see java.awt.event.ActionListener
@since JDK1.1
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