AppForecast.java

//Luis Fernando Flores Luna   A01324611

import java.util.*;

public class AppForecast implements Observer, DisplayElement{
  private float currentPressure = 29.92f;
  private float lastPressure;
  private WeatherData weatherData;

  public AppForecast(WeatherData weatherData){
    this.weatherData = weatherData;
    weatherData.registerObserver(this);
  }

  public void update(float temp, float humidity, float pressure){
    lastPressure = currentPressure;
    currentPressure = pressure;

    display();
  }

  public void display(){
    System.out.println("Forecast: ");
    if (currentPressure > lastPressure) {
      System.out.println("Improving weather on the way");
    }else if (currentPressure == lastPressure) {
      System.out.println("More of the same");
    } else if (currentPressure < lastPressure) {
      System.out.println("Watch out for cooler, rainy weather");
    }
  }

}