What is the output of the following code? (Choose all that apply)
❌ A. 2 ❌ B. 4 ✅ C. The code will not compile because of line 3. ✅ D. The code will not compile because of line 5. ✅ E. The code will not compile because of line 7. ❌ F. The code will not compile because of line 11. ❌ G. The output cannot be determined from the code provided.
Explanation: First, the method getTailLength() in the interface HasTail is assumed to be public, since it is part of an interface. The implementation of the method on line 3 is therefore an invalid override, as protected is a more restrictive access modifier than public, so option C is correct. Next, the class Cougar implements an overloaded ver- sion of getTailLength(), but since the declaration in the parent class Puma is invalid, it needs to implement a public version of the method. Since it does not, the declaration of Puma is invalid, so option D is correct. Option E is incorrect, since Puma is marked abstract and cannot be instantiated. The overloaded method on line 11 is declared correctly, so option F is not correct. Finally, as the code has multiple compiler errors, options A, B, and G can be eliminated.
What is the output of the following code? (Choose all that apply)
❌ A. 2 ❌ B. 4 ✅ C. The code will not compile because of line 3. ✅ D. The code will not compile because of line 5. ✅ E. The code will not compile because of line 7. ❌ F. The code will not compile because of line 11. ❌ G. The output cannot be determined from the code provided.
Explanation: First, the method getTailLength() in the interface HasTail is assumed to be public, since it is part of an interface. The implementation of the method on line 3 is therefore an invalid override, as protected is a more restrictive access modifier than public, so option C is correct. Next, the class Cougar implements an overloaded ver- sion of getTailLength(), but since the declaration in the parent class Puma is invalid, it needs to implement a public version of the method. Since it does not, the declaration of Puma is invalid, so option D is correct. Option E is incorrect, since Puma is marked abstract and cannot be instantiated. The overloaded method on line 11 is declared correctly, so option F is not correct. Finally, as the code has multiple compiler errors, options A, B, and G can be eliminated.
BY Explanations “Top Java Quiz Questions”
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For some time, Mr. Durov and a few dozen staffers had no fixed headquarters, but rather traveled the world, setting up shop in one city after another, he told the Journal in 2016. The company now has its operational base in Dubai, though it says it doesn’t keep servers there.Mr. Durov maintains a yearslong friendship from his VK days with actor and tech investor Jared Leto, with whom he shares an ascetic lifestyle that eschews meat and alcohol.
Telegram and Signal Havens for Right-Wing Extremists
Since the violent storming of Capitol Hill and subsequent ban of former U.S. President Donald Trump from Facebook and Twitter, the removal of Parler from Amazon’s servers, and the de-platforming of incendiary right-wing content, messaging services Telegram and Signal have seen a deluge of new users. In January alone, Telegram reported 90 million new accounts. Its founder, Pavel Durov, described this as “the largest digital migration in human history.” Signal reportedly doubled its user base to 40 million people and became the most downloaded app in 70 countries. The two services rely on encryption to protect the privacy of user communication, which has made them popular with protesters seeking to conceal their identities against repressive governments in places like Belarus, Hong Kong, and Iran. But the same encryption technology has also made them a favored communication tool for criminals and terrorist groups, including al Qaeda and the Islamic State.
