?? heatindexdisplay.java
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package headfirst.observer.weatherobservable;import java.util.Observable;import java.util.Observer;public class HeatIndexDisplay implements Observer, DisplayElement { float heatIndex = 0.0f; public HeatIndexDisplay(Observable observable) { observable.addObserver(this); } public void update(Observable observable, Object arg) { if (observable instanceof WeatherData) { WeatherData weatherData = (WeatherData)observable; float t = weatherData.getTemperature(); float rh = weatherData.getHumidity(); heatIndex = (float) ( (16.923 + (0.185212 * t)) + (5.37941 * rh) - (0.100254 * t * rh) + (0.00941695 * (t * t)) + (0.00728898 * (rh * rh)) + (0.000345372 * (t * t * rh)) - (0.000814971 * (t * rh * rh)) + (0.0000102102 * (t * t * rh * rh)) - (0.000038646 * (t * t * t)) + (0.0000291583 * (rh * rh * rh)) + (0.00000142721 * (t * t * t * rh)) + (0.000000197483 * (t * rh * rh * rh)) - (0.0000000218429 * (t * t * t * rh * rh)) + (0.000000000843296 * (t * t * rh * rh * rh)) - (0.0000000000481975 * (t * t * t * rh * rh * rh))); display(); } } public void display() { System.out.println("Heat index is " + heatIndex); }}?? 快捷鍵說明
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