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Java - Core0
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Можно ли создать своё исключение?
Да, через наследование от Exception или RuntimeException.
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Что делает ключевое слово throw?
Явно выбрасывает исключение.
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Можно ли в одном try использовать несколько catch?
Да
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Обязателен ли блок finally?
Нет
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Какой блок используется для обработки исключений?
try-catch
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Пример unchecked исключения?
NullPointerException
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Пример checked исключения?
IOException
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Чем отличаются checked и unchecked исключения?
Checked проверяются во время компиляции, unchecked — во время выполнения.
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От какого класса наследуются все исключения?
Throwable
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Что такое исключение в Java?
Ошибка, возникающая во время выполнения программы.
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Какой интерфейс расширяет Collection и представляет упорядоченную коллекцию?
List
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Что такое Iterator?
Объект для пошагового перебора элементов
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Какой метод используется для обхода коллекции?
for-each, iterator()
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В чём отличие HashSet от TreeSet?
HashSet не сортирует, TreeSet — сортирует.
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Что делает HashMap?
Хранит пары ключ-значение
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Как избежать дублирующих элементов в коллекции?
Использовать Set
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Какой интерфейс реализует множество?
Set
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В чём разница между ArrayList и LinkedList?
ArrayList быстрее по доступу, LinkedList — по вставке/удалению.
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Какой интерфейс реализует список?
List
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Что такое коллекции в Java?
Контейнеры для хранения объектов.
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Чем отличается класс от объекта?
Класс — шаблон, объект — экземпляр.
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Можно ли создать объект от интерфейса?
Нет, только через класс-реализацию.
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Что делает ключевое слово this?
Ссылается на текущий объект.
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Что такое абстрактный класс?
Класс с нереализованными (abstract) методами.
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Чем отличается перегрузка от переопределения метода?
Перегрузка – в одном классе, переопределение – в наследнике.
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Что такое полиморфизм?
Один интерфейс – разное поведение.
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Как реализуется наследование в Java?
Через ключевое слово extends.
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Что такое инкапсуляция?
Сокрытие данных внутри объекта.
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Назови 4 принципа ООП
Наследование, инкапсуляция, полиморфизм, абстракция.
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Что такое ООП?
Подход к программированию на основе объектов.
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Что будет, если переполнить byte?
Значение «перекатится» (будет -128 → 127)
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Можно ли null присвоить примитиву?
Нет
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Сколько байт занимает тип int?
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Какой тип используется для логических значений?
boolean
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Какой тип имеет наибольший диапазон значений?
long
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Чем отличается float от double?
double точнее и занимает больше памяти
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Какой тип используется для хранения символов?
char
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Какой тип занимает 1 байт?
byte
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Какой тип используется для хранения целых чисел от -128 до 127?
byte
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Сколько всего примитивных типов в Java?
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