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2526-S7-Programmation Orientée Objet Avancée

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Dans une implémentation du pattern State, comment est typiquement géré le changement d’état d’un objet ?
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Quel est le principal avantage du design pattern State ?
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Soit la classe suivante : 

public final class Singleton {

private static Singleton instance;

private String value;

private Singleton(String value) {

this.value = value;

}

public static Singleton getInstance(String value) {

if (instance == null) {

instance = new Singleton(value);

}

return instance;

}

}

Quelles affirmations sont vraies ?

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Dans le pattern Observer, quelle relation existe entre le sujet (subject) et les observateurs ?
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Dans le pattern Observer, que se passe-t-il lorsqu’un sujet change d’état ?
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Quel problème principal le pattern Composite cherche-t-il à résoudre ?
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A quelle design pattern ce code fait il référence ?

package com.Mystere;

public class Mystere {

static Mystere instance=null;

private Mystere(){

}

public static Mystere getInstance(){

if (instance==null){

instance = new Mystere();

}

return instance;

}

}

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Veuillez associer les cas d'usages des cinq design pattern vue en cours.

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