1: public class Squares { 2: public static long square(int x) { 3: long y = x * (long) x; 4: x = -1; 5: return y; 6: } 7: public static void main(String[] args) { 8: int value = 9; 9: long result = square(value); 10: System.out.println(value); 11: } }
❌ A. -1 ✅ B. 9 ❌ C. 81 ❌ D. Compiler error on line 9. ❌ E. Compiler error on a different line
Explanation: Since Java is pass-by-value and the variable on line 8 never gets reassigned, it stays as 9. In the method square, x starts as 9. y becomes 81 and then x gets set to –1. Line 9 does set result to 81. However, we are printing out value and that is still 9.
1: public class Squares { 2: public static long square(int x) { 3: long y = x * (long) x; 4: x = -1; 5: return y; 6: } 7: public static void main(String[] args) { 8: int value = 9; 9: long result = square(value); 10: System.out.println(value); 11: } }
❌ A. -1 ✅ B. 9 ❌ C. 81 ❌ D. Compiler error on line 9. ❌ E. Compiler error on a different line
Explanation: Since Java is pass-by-value and the variable on line 8 never gets reassigned, it stays as 9. In the method square, x starts as 9. y becomes 81 and then x gets set to –1. Line 9 does set result to 81. However, we are printing out value and that is still 9.
BY Explanations “Top Java Quiz Questions”
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The SSE was the first modern stock exchange to open in China, with trading commencing in 1990. It has now grown to become the largest stock exchange in Asia and the third-largest in the world by market capitalization, which stood at RMB 50.6 trillion (US$7.8 trillion) as of September 2021. Stocks (both A-shares and B-shares), bonds, funds, and derivatives are traded on the exchange. The SEE has two trading boards, the Main Board and the Science and Technology Innovation Board, the latter more commonly known as the STAR Market. The Main Board mainly hosts large, well-established Chinese companies and lists both A-shares and B-shares.
Telegram auto-delete message, expiring invites, and more
elegram is updating its messaging app with options for auto-deleting messages, expiring invite links, and new unlimited groups, the company shared in a blog post. Much like Signal, Telegram received a burst of new users in the confusion over WhatsApp’s privacy policy and now the company is adopting features that were already part of its competitors’ apps, features which offer more security and privacy. Auto-deleting messages were already possible in Telegram’s encrypted Secret Chats, but this new update for iOS and Android adds the option to make messages disappear in any kind of chat. Auto-delete can be enabled inside of chats, and set to delete either 24 hours or seven days after messages are sent. Auto-delete won’t remove every message though; if a message was sent before the feature was turned on, it’ll stick around. Telegram’s competitors have had similar features: WhatsApp introduced a feature in 2020 and Signal has had disappearing messages since at least 2016.
