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WeatherData.java
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45 lines (37 loc) · 1.19 KB
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package equipJava.designPattern.observer;
import java.util.ArrayList;
public class WeatherData implements Subject {
private ArrayList<Observer> observers;
private double temperature;
private double humidity;
private double pressure;
public WeatherData() {
this.observers = new ArrayList<>();
}
@Override
public void registerObserver(Observer o) {
observers.add(o);
}
@Override
public void removeObserver(Observer o) {
observers.remove(o);
}
@Override
public void notifyObservers() {
for (Observer observer : observers) {
observer.update(temperature, humidity, pressure);
}
}
// 该方法会在源数据发生变化时背调用，即WeatherData中的天气数据自动获得更新
// 因此下一步就是通知各个观察者
public void measurementsChanged() {
notifyObservers();
}
// 用于手动设置数据，特别是测试阶段
public void setMeasurements(double temperature, double humidity, double pressure) {
this.temperature = temperature;
this.humidity = humidity;
this.pressure = pressure;
measurementsChanged();
}
}