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CurrentConditionDisplay.java
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35 lines (29 loc) · 1.17 KB
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package equipJava.designPattern.observer;
public class CurrentConditionDisplay implements Observer, DisplayElement {
private Subject subject;
private double temperature;
private double humidity;
public CurrentConditionDisplay(Subject subject) {
this.subject = subject;
this.subject.registerObserver(this);
}
public void unsubscribe() {
this.subject.removeObserver(this);
}
@Override
public void dispaly() {
System.out.println("CurrentConditionDisplay (temperature: " + this.temperature
+ ", humidity: " + humidity + ")");
}
/**
* 由于该display只需要其中的两个数据另一个则被忽略了，而且当增加或减少传递的数据种类时
* 所有观察者中的update方法都可能要修改，因此也可以选择让观察者自己去获取数据，比如：
* 此时update就不再传参了，而具体的天气数据则通过weatherData的getXX方法获取
*/
@Override
public void update(double temperature, double humidity, double pressure) {
this.temperature = temperature;
this.humidity = humidity;
dispaly();
}
}