CISC370-011 -- demo code from class #6

This page provides links to some short demo programs from class #6 (14 Oct):

• Text1.java is a very simple demonstration of the JTextField class.
• Text2.java shows how a DocumentListener can be hooked up to a JTextField.
• Check1.java demonstrates the JCheckBox class.
• Radio1.java demonstrates the JRadioButton class.
• BoxDemo.java illustrates the Box layout object. It also shows the use of the BorderFactory class to decorate Swing components.
• Label1.java demonstrates JLabel's capabilities, including its ability to display images and HTML text.
• ComplexMenu.java demonstrates complex menu items with the JCheckBoxMenuItem and JRadioButtonMenuItem classes.
• Combo1.java is an example of a simple JComboBox.
• TFormat1.java shows a simple example of JFormattedTextFields using a DefaultFormatter and a MaskFormatter.
• ColorNames.java demonstrates a JTextArea inside a JScrollPane.
• FileSelect1.java demonstrates the JFileChooser class by implementing a simple image display program.

The extended example of the Strategy pattern was an ODE (Ordinary Differential Equation) solver/problem. The test code defines a Traject ODE according to the ODE pattern, then creates an ODESolver object of class Euler to integrate the ODE. The example uses JFreeChart to draw the resulting family of curves.

The source files are:

• TrajectApp.java -- The main program.
• Traject.java -- The Traject class, that represents a 2D ballistic trajectory with drag.
• ODE.java -- The interface which any ODE problem should implement.
• ODESolver.java -- The interface which any ODE solver should implement.
• Euler.java -- Implements the ODE interface. Note that this is a very poor integrator! Don't use it to solve real problems; use Runge-Kutta, predictor-corrector, or something better instead.

And the output from the program is: