Computer scienceProgramming languagesJavaCode organizationDesign patternsBehavioral patterns

Observer

Theory

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Uh-oh! Somebody has removed parts of the Observer pattern code.

Restore the implementation of the pattern and help Rockstar release the game and notify the fans.

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

Sample Input 1: 

Red Dead Redemption

Sample Output 1: 

It's happened! RockstarGames releases new game - Red Dead Redemption!
Inform message to : Garry Rose
Garry Rose says: I want to pre-order
Inform message to : Peter Johnston
Peter Johnston says: Pinch me...
Inform message to : Helen Jack
Helen Jack says: Jesus, it's new game from Rockstar!
Write a program in Java 17
import java.util.*;

/** Observable */

/** Concrete Observable */
class RockstarGames {

public String releaseGame;
/* write your code here ... */

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

}

/** Observer */

/** Concrete Observer */
class Gamer {

private String name;
private String reaction;
private Set<String> games = new HashSet<>();

public Gamer(String name, String reaction) {
this.reaction = reaction;
this.name = name;
}

/* write your code here ... */

public void buyGame(String game) {
games.add(game);
System.out.println(reaction);
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