51 lines
1.0 KiB
Java
51 lines
1.0 KiB
Java
package com.iluwatar;
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import java.util.ArrayList;
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import java.util.List;
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public class Weather {
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private WeatherType currentWeather;
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private List<WeatherObserver> observers;
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public Weather() {
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observers = new ArrayList<>();
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currentWeather = WeatherType.SUNNY;
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}
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public void addObserver(WeatherObserver obs) {
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observers.add(obs);
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}
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public void removeObserver(WeatherObserver obs) {
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observers.remove(obs);
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}
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public void timePasses() {
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switch (currentWeather) {
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case COLD:
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currentWeather = WeatherType.SUNNY;
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break;
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case RAINY:
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currentWeather = WeatherType.WINDY;
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break;
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case SUNNY:
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currentWeather = WeatherType.RAINY;
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break;
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case WINDY:
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currentWeather = WeatherType.COLD;
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break;
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default:
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break;
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}
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System.out.println("The weather now changes to " + currentWeather);
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notifyObservers();
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}
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private void notifyObservers() {
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for (WeatherObserver obs: observers) {
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obs.update(currentWeather);
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}
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}
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}
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