❌ A. The CanBark interface doesn’t compile ❌ B. A class that implements HasVocalCords must override the makeSound() method ✅ C. A class that implements CanBark inherits both the makeSound() and bark() methods ❌ D. A class that implements CanBark only inherits the bark() method ❌ E. An interface cannot extend another interface ❌ F. All statements are false
Explanation: The code compiles without issue, so option A is wrong. Option B is incorrect, since an abstract class could implement HasVocalCords without the need to override the makeSound() method. Option C is correct; any class that implements CanBark automatically inherits its methods, as well as any inherited methods defined in the parent interface. Because option C is correct, it follows that option D is incorrect. Finally, an interface can extend multiple interfaces, so option E is incorrect.
❌ A. The CanBark interface doesn’t compile ❌ B. A class that implements HasVocalCords must override the makeSound() method ✅ C. A class that implements CanBark inherits both the makeSound() and bark() methods ❌ D. A class that implements CanBark only inherits the bark() method ❌ E. An interface cannot extend another interface ❌ F. All statements are false
Explanation: The code compiles without issue, so option A is wrong. Option B is incorrect, since an abstract class could implement HasVocalCords without the need to override the makeSound() method. Option C is correct; any class that implements CanBark automatically inherits its methods, as well as any inherited methods defined in the parent interface. Because option C is correct, it follows that option D is incorrect. Finally, an interface can extend multiple interfaces, so option E is incorrect.
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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.
How to Use Bitcoin?
n the U.S. people generally use Bitcoin as an alternative investment, helping diversify a portfolio apart from stocks and bonds. You can also use Bitcoin to make purchases, but the number of vendors that accept the cryptocurrency is still limited. Big companies that accept Bitcoin include Overstock, AT&T and Twitch. You may also find that some small local retailers or certain websites take Bitcoin, but you’ll have to do some digging. That said, PayPal has announced that it will enable cryptocurrency as a funding source for purchases this year, financing purchases by automatically converting crypto holdings to fiat currency for users. “They have 346 million users and they’re connected to 26 million merchants,” says Spencer Montgomery, founder of Uinta Crypto Consulting. “It’s huge.”
