What is "The Observer Pattern: The Full Code" about?

The full observer pattern project as real, browsable files and folders, in C++, TypeScript, JavaScript, and Java.

What topics does "The Observer Pattern: The Full Code" cover?

This article covers: observer design pattern full example, observer pattern project structure, observer pattern c++, gang of four design patterns, design patterns explained.

Observer Pattern: Complete Multi-File Code Example

The last three posts built the observer pattern piece by piece. This post is the reference: the whole project, as real files in real folders.

One small, real quirk worth noticing: the Java version's folder is weatherstation, not weather-station like the other three languages. Java package names can't contain a hyphen, so a real Java project just doesn't use one here.

main.cpp

#include "weather-station/WeatherStation.h"
#include "weather-station/PhoneDisplay.h"
#include "weather-station/WindowDisplay.h"

int main() {
    WeatherStation station;

    PhoneDisplay phone(&station);
    WindowDisplay window(&station);
    station.add(&phone);
    station.add(&window);

    station.setTemperature(72);
    station.setTemperature(68);

    return 0;
}

Run this yourself: This exact file layout lives in the code-practice repo. Clone it, cd into whichever language folder, and build it the same way as the other labs in this series.