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Dans quel cas suivant le code compile ?

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Dans quel cas suivant le code compile ?

List<? extends Number> list = new ArrayList<Double>();

list.add(null);

✅

List<? super Number> list = new ArrayList<Object>();

list.add(3.14);

✅

List<? extends Number> list = new ArrayList<Integer>();

list.add(3.14);

❌

List<? super Number> list = new ArrayList<Integer>();

list.add(12);

❌

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