24. Extending the JFrame class

• Common practice: define a class that descends from JFrame class

• Advantages: configure JFrame properties and controls in object's constructor

• Note: remember to call parent class constructor using the super keyword

  
      public class JMyFrame extends JFrame
      {
          static final int WINDOW_WIDTH = 210;
          static final int WINDOW_HEIGHT = 130;
  
          //constructor
          public JMyFrame()
          {
              super( "window title goes here" );
              setSize( WINDOW_WIDTH, WINDOW_HEIGHT );
              setDefaultCloseOperation( javax.swing.WindowConstants.EXIT_ON_CLOSE );
              setVisible( true );
          }
      }//class JMyFrame