?? statisticsdisplay.java
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package headfirst.observer.weather;import java.util.*;public class StatisticsDisplay implements Observer, DisplayElement { private float maxTemp = 0.0f; private float minTemp = 200; private float tempSum= 0.0f; private int numReadings; private WeatherData weatherData; public StatisticsDisplay(WeatherData weatherData) { this.weatherData = weatherData; weatherData.registerObserver(this); } public void update(float temp, float humidity, float pressure) { tempSum += temp; numReadings++; if (temp > maxTemp) { maxTemp = temp; } if (temp < minTemp) { minTemp = temp; } display(); } public void display() { System.out.println("Avg/Max/Min temperature = " + (tempSum / numReadings) + "/" + maxTemp + "/" + minTemp); }}
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