By Steven John Metsker
Offers examples, routines, and demanding situations that make it easier to grapple with substitute techniques and notice sensible subtleties in making use of layout development thought to sensible difficulties. Softcover. CD-ROM incorporated.
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Additional info for Design Patterns Java(TM) Workbook
The muzzle velocity also lets you calculate the lifting charge force, so you can model thrust as an initial spike that quickly drops to zero. 18 Chapter 3. 2 to show the design of a ShellAsRocket class that lets a Shell object participate in a simulation as a RocketSim object. 2. You can adapt a shell's methods to meet the needs of a rocket simulation. units package help developers at Oozinoz to prevent unit conversion errors. Rather than using double to represent everything from inches of length to pounds of force, the Oozinoz developers have created a sophisticated object model for measurements.
As such, demos provide much of the same value as facades. 2 Write down two differences between a demo and a facade. 41 Chapter 4. swing package contains JOptionPane, a class that "makes it easy to pop up a standard dialog box," according to the class comment. 5. The JOptionPane class makes it easy to display dialogs such as this one. 3 The JOptionPane does in fact make it easy to display a dialog. State whether this class is a facade, a utility, or a demo, and justify your answer. 4 Few facades appear in the Java class libraries.
Suppose that you want to show a few rockets in a table, using a Swing user interface. 6 shows, you can create a RocketTable class that adapts an array of rockets to the interface that TableModel and AbstractTableModel expect. 23 Chapter 3. 6. The RocketTable class adapts the TableModel interface to the Rocket class from the Oozinoz domain. The RocketTable class has to subclass AbstractTableModel because AbstractTableModel is a class, not an interface. Whenever the interface you are adapting to is supported with an abstract class, you must use an object adapter.