... happens to be the defaultlayout for a JFrame. (To be more accurate, it is the default for a ContentPane, but it’s permis-sible to think of it as the default for a JFrame.) 87LESSON 18■ ■ ... instance, we can execute an SQLstring. For this example, imagine we have extracted some booking information from a userinterface—we are going to add this information as a record to a table in our ... containsthe classes for two important parts of the GUI: event handling and the layout managers.83LESSON 17■ ■ ■6250CH17.qxd 2/22/06 5:01 PM Page 83■NoteI have changed the button labels for this lesson./**...