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Avoid designing a class that has no methods. Use design patterns. Reduce the visibility of things as much as possible. Use overloading rather than logic. Avoid long argument lists.

Don t invoke potentially overridable methods from a constructor. Code to interfaces. Use abstract classes when you need implementation functionality. Make objects you re finished with eligible for garbage collection. Don t make more objects than you need to. Avoid deeply nested and complex logic. Use getters and setters that follow the JavaBean naming convention. Don t be a procedural programmer in an OO world. Make variable and method names as self-explanatory as possible. Make your own Exception classes if you can t find one in the API to

x 0.00 0.10 0.20 0.30 0.40 0.50 0.70

Hide implementation details. Use appropriate class granularity. Use appropriate method granularity. Use encapsulation.

x 0.80 0.90 1.00 1.50 2.00 3.00 5.00

Don t return error codes. Don t send out excessive command-line messages. Use dialogs boxes where appropriate.

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Throw checked exceptions appropriately. Create and throw your own exceptions when appropriate. Catch low-level implementation exceptions and throw a high-level business

Now consider the basic series RL circuit, to which a constant voltage of V volts is applied at the closing of a switch, as shown in Fig. 19-A. In Fig. 19-A, L is inductance in henrys, R is resistance in ohms, and i is current in amperes owing any time t seconds after the switch is closed at t 0. At t 0 the current i is zero, at which time the entire applied voltage V appears across the coil L; then, as time increases, the current increases slowly toward the limiting value of I V=R, as shown in Fig. 20-A. As this occurs, the voltage drop across L decreases, while the voltage drop across R rises toward the limiting value of IR V volts. The exact relationship between the current i and time t is given by the equation i V 1 Rt=L R 6-A

a detail message).

There are several key aspects of GUI design that you need to consider when designing and implementing the GUI for your project. At a high level, they can be broken down into two main areas of focus:

Note that when t 0, then i 0, as already mentioned, and as shown in Fig. 20-A. Then, as time increases, the term Rt=L decreases exponentially toward the value zero (as

1. Designing the GUI to be usable and friendly from the end user s perspective. 2. Designing and implementing the GUI to be reliable, and maintainable from the programmer s perspective.

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in Fig. 18-A). Thus, as time t increases, the current i increases toward the limiting value of i I V=R amperes, as shown in Fig. 20-A. In Fig. 20-A, note that time is expressed in multiples of L/R. This can be done because the ratio of henrys to ohms is time in seconds, as the following shows. By eq. (181), L and, by Ohm s law, 1 amp R volts hence, L volts sec amp seconds R amp volts The ratio of henrys to ohms, L/R, is called the time constant of the basic series circuit of Fig. 19-A. As Fig. 20-A shows, at the end of one time constant (L/R seconds) the current in Fig. 19-A will have risen to approximately 63% of its nal value of I V=R amperes. (To show this, set t L=R in eq. (6-A).) v volts volts sec di=dt amp=sec amp

This chapter will focus almost entirely on the first point ease of use for the end user. We start with a very brief overview of the technical issues you probably want to address in implementing your GUI for this project. After that brief overview, we dive into the topic of usability.

Most of your GUI work on the exam assignment will be focused on usability. But for the final review, you might be asked to justify not just the user-friendliness, but also the technical considerations you took into account when designing and building your GUI. This section gives you a brief overview of some of the technical issues you need to keep in mind.

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