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Вопрос с собеседования

Чем @Component, @Service и @Repository отличаются друг от друга?

Ответ: Все три аннотации создают Spring-бин, но:
▶️ @Component – универсальная аннотация для любых бинов
▶️ @Service – указывает, что класс содержит бизнес-логику
▶️ @Repository – используется для DAO-слоя, добавляет обработку SQL-исключений

tags: #собеседование

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Вопрос с собеседования

Чем @Component, @Service и @Repository отличаются друг от друга?

Ответ: Все три аннотации создают Spring-бин, но:
▶️ @Component – универсальная аннотация для любых бинов
▶️ @Service – указывает, что класс содержит бизнес-логику
▶️ @Repository – используется для DAO-слоя, добавляет обработку SQL-исключений

tags: #собеседование

👉 Java Rocks | #собеседование

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Bitcoin mining is the process of adding new transactions to the Bitcoin blockchain. It’s a tough job. People who choose to mine Bitcoin use a process called proof of work, deploying computers in a race to solve mathematical puzzles that verify transactions.To entice miners to keep racing to solve the puzzles and support the overall system, the Bitcoin code rewards miners with new Bitcoins. “This is how new coins are created” and new transactions are added to the blockchain, says Okoro.

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Durov said on his Telegram channel today that the two and a half year blockchain and crypto project has been put to sleep. Ironically, after leaving Russia because the government wanted his encryption keys to his social media firm, Durov’s cryptocurrency idea lost steam because of a U.S. court. “The technology we created allowed for an open, free, decentralized exchange of value and ideas. TON had the potential to revolutionize how people store and transfer funds and information,” he wrote on his channel. “Unfortunately, a U.S. court stopped TON from happening.”

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