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One lesson we learned the hard way after years of NetBeans API development is, Don t put setter methods in the true API. By true API, we mean the interfaces that must be implemented to provide something. If setter methods are needed at all and usually they aren t they belong only in the convenience base classes. Let s look at javax.swing.Action as an example that violates this rule. The setEnabled(boolean) method doesn t belong in the Action interface. Probably it shouldn t exist at all, but if so, it should be a protected method in AbstractAction, which is a support class to simplify implementation of the Action interface. The boolean isEnabled() method is the API! It s the method that everyone should call. But who is supposed to call setEnabled(boolean) At most only the creator of the action; this is an implementation detail for everyone else. If your action happens to have a global enablement state that a listener normally manipulates by turning it on or off programmatically, setEnabled(boolean) is a handy protected final method to have in a base class such as AbstractAction. However, Action.setEnabled is wrong for the following reasons: It implies that unknown external clients should call this method. They certainly should not. It makes no sense for context-sensitive actions, though the Action API generally is lacking in this area. We tried hard to find some reasonable way to use Swing s actions in this area and we can certainly report a success. However, it s clear that the original Action class design was done by people who didn t have to think about modular design at all.

Figure 9-9. Shield with LM386-based audio amplifier in place and speaker connected If you have an old speaker from a stereo system you can connect a pair of wires to it and attach them to the screw terminals. Otherwise, use a small speaker from an electronics parts shop, an old computer

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It makes no sense to have a setEnabled method for an action that is always enabled. Those actions just want to return true from isEnabled regardless of anything that happens around them. It makes no sense to have an action whose enablement is computed in isEnabled on demand. If you want to compute the state of your actions just when you are asked to do it, then a setter isn t the right method to use. If you need to implement a pull strategy, then you want to provide the result, but not pretend you know anything about the global state of the action. Instead, you want the system to query you for the right state again when the value of isEnabled is needed. This advice isn t meant to discredit every setter in an API. Sometimes they re useful. Sometimes, as in the case of Spring s dependency injections, they re essential. However, often they re redundant. Similar examples of too many setters can be found in other places and they re usually the result of a desire to make the API rich with functionality, which is in fact counterproductive. Maintenance becomes increasingly cumbersome. In addition, as shown in the Action example, the semantics of such an API are hard to grasp. The advice here is simple: beware of unneeded setters in an API.

speaker, or even a speaker out of a car stereo system, and solder two wires to the speaker. Then insert the other ends into the screw terminals on the shield. Turn the trimpot to about halfway as a starting point so it has a reasonable volume level. Mount the shield on your Arduino, and install the software to test it.

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