1: public class _C { 2: private static int $; 3: public static void main(String[] main) { 4: String a_b; 5: System.out.print($); 6: System.out.print(a_b); 7: } }
❌ A. Compiler error on line 1. ❌ B. Compiler error on line 2. ❌ C. Compiler error on line 4. ❌ D. Compiler error on line 5. ✅ E. Compiler error on line 6. ❌ F. 0null ❌ G. nullnull
Explanation: Option E is correct because local variables require assignment before referencing them. Option D is incorrect because class and instance variables have default values and allow referencing. a_b defaults to a null value. Options A, B, and C are incorrect because identifiers may begin with a letter, underscore, or dollar sign. Options F and G are incorrect because the code does not compile. If a_b was an instance variable, the code would compile and output 0null
1: public class _C { 2: private static int $; 3: public static void main(String[] main) { 4: String a_b; 5: System.out.print($); 6: System.out.print(a_b); 7: } }
❌ A. Compiler error on line 1. ❌ B. Compiler error on line 2. ❌ C. Compiler error on line 4. ❌ D. Compiler error on line 5. ✅ E. Compiler error on line 6. ❌ F. 0null ❌ G. nullnull
Explanation: Option E is correct because local variables require assignment before referencing them. Option D is incorrect because class and instance variables have default values and allow referencing. a_b defaults to a null value. Options A, B, and C are incorrect because identifiers may begin with a letter, underscore, or dollar sign. Options F and G are incorrect because the code does not compile. If a_b was an instance variable, the code would compile and output 0null
BY Explanations “Top Java Quiz Questions”
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Launched in 2013, Telegram allows users to broadcast messages to a following via “channels”, or create public and private groups that are simple for others to access. Users can also send and receive large data files, including text and zip files, directly via the app.The platform said it has more than 500m active users, and topped 1bn downloads in August, according to data from SensorTower.
Telegram Auto-Delete Messages in Any Chat
Some messages aren’t supposed to last forever. There are some Telegram groups and conversations where it’s best if messages are automatically deleted in a day or a week. Here’s how to auto-delete messages in any Telegram chat. You can enable the auto-delete feature on a per-chat basis. It works for both one-on-one conversations and group chats. Previously, you needed to use the Secret Chat feature to automatically delete messages after a set time. At the time of writing, you can choose to automatically delete messages after a day or a week. Telegram starts the timer once they are sent, not after they are read. This won’t affect the messages that were sent before enabling the feature.
