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3 A simple GUI // Import packages that contain components, containers and layout managers. *; // The GUI class inherits from a container of the JFrame type. The JFrame container will act // as a top-level, outer container for any inner containers that are added to it. public class SwingHelloGUI extends JFrame { // Declare instance variables. // A JTextField component can be used to enter text. private JTextField tf; // A JButton component is typically used as an active component that the user presses // in order to trigger an action to take place.

InvokeLater( new Runnable( ) { // start of anonymous class definition of the Runnable object // call the thread’s run method public void run( ) { // call the GUI’s constructor MySwingClass gui = new MySwingClass( ); } // end of run method } // end of Runnable class definition ); // end of call to invokeLater method } // end of main } // end class definition Although there is quite a lot going on in main, it is not important that the reader understands its code in full yet. For the present purposes, it is important to note that an anonymous Runnable object has been created by calling its constructor within the brackets of the invokeLater method.

2 The architecture of a typical client/server application Tier 1, the client tier, comprises the UI; tier 2, the server tier, comprises the business objects of the application; tier 3, the persistent data tier, comprises data storage components such as data files and database tables. In the case of the themed application, the third tier comprises a data file that stores an array of members of the Media Store. In a typical client/server application, the UI interacts with the server-side objects which, in turn, interact with the data tier.

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