Design/observerclassdiagram.svg

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      >businesslogic</text
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      >observer</text
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      >-subscribers : List&lt;TrafficLight&gt;</text
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      >+subscribe()</text
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      >+unsubscribe()</text
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      >+notifyObservers()</text
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      >TrafficLightService</text
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      >+update()</text
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      >&lt;&lt;Interface&gt;&gt;</text
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      >EventListener</text
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      >components</text
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      >+getListOfAllLights()</text
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      >+showActiveLights()</text
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      >&lt;&lt;Interface&gt;&gt;</text
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      >TrafficLight</text
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      >+lightsInUse(colorList)</text
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      >+changeState()</text
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      >&lt;&lt;Interface&gt;&gt;</text
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      >Context</text
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      >&lt;&lt;uses&gt;&gt;</text
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      >Visual Paradigm Professional(boris(Fontys Hogeschool voor Techniek en Bedrijfsmanagement))</text
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