Computer scienceProgramming languagesJavaCode organizationDesign patternsBehavioral patterns

Observer

Theory

Rockstar games

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Given classes and interface are the components of the Observer pattern.

RockstarGames is the concrete implementation of the Observable and Gamer is the concrete implementation of the Observer.

Implement RockstarGames methods to notify the gamers when a new game is released.

Please, do not change the provided code of the classes.

Sample Input 1: 

Red Dead Redemption

Sample Output 1: 

Notification for gamer : Garry Rose
Garry Rose says : "Oh, Rockstar releases new game Red Dead Redemption !"
Notification for gamer : Peter Johnston
Peter Johnston says : "Oh, Rockstar releases new game Red Dead Redemption !"
Notification for gamer : Helen Jack
Helen Jack says : "Oh, Rockstar releases new game Red Dead Redemption !"
Write a program in Java 17
import java.util.*;

/**
* Observable interface
**/
interface Observable {

void addObserver(Observer observer);

void removeObserver(Observer observer);

void notifyObservers();
}

/**
* Concrete Observable - Rockstar Games
**/
class RockstarGames implements Observable {

public String releaseGame;
private List<Observer> observers = new ArrayList<>();

public void release(String releaseGame) {
this.releaseGame = releaseGame;
// write your code here ...
}

@Override
public void addObserver(Observer observer) {
// write your code here ...
}

@Override
public void removeObserver(Observer observer) {
// write your code here ...
}
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