最终的结果是实现了必要的业务逻辑和JUnit测试用例，可验证实现的行为。

The end result is an implementation of the business logic required and a JUnit test case that can verify the behavior of the implementation.

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采用PID控制算法对水温进行控制，试用半年证实该系统具有性能稳定、控制灵敏、抗干扰能力强等优点。

Adopted PID algorithm is used in the water temperature control. We have used the system for 6 months. It has stability, high sensitivity and powerful disturbance resistance.

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