Java™ How To Program (Early Objects), Tenth Edition

Creating and Displaying a LabelFrame Window

Class LabelTest (Fig. 12.7) creates an object of class LabelFrame (line 9), then specifies the default close operation for the window. By default, closing a window simply hides the window. However, when the user closes the LabelFrame window, we would like the application to terminate. Line 10 invokes LabelFrame’s setDefaultCloseOperation method (inherited from class JFrame) with constant JFrame.EXIT_ON_CLOSE as the argument to indicate that the program should terminate when the window is closed by the user. This line is important. Without it the application will not terminate when the user closes the window. Next, line 11 invokes LabelFrame’s setSize method to specify the width and height of the window ...