❌ A. true true true true ❌ B. false false false false ❌ C. false true false true ✅ D. true true false true ❌ E. false true true true ❌ F. true false false true ❌ G. The code does not compile ❌ H. None of the above
Explanation: On line 15, we have a compile-time constant that automatically gets placed in the string pool as "rat1" . On line 16, we have a more complicated expression that is also a compiletime constant. Therefore, first and second share the same string pool reference. This makes line 18 and 19 print true. On line 17, we have a String constructor. This means we no longer have a compile-time constant, and third does not point to a reference in the string pool. Therefore, line 20 prints false . On line 21, the intern() call looks in the string pool. Java notices that first points to the same String and prints true.
❌ A. true true true true ❌ B. false false false false ❌ C. false true false true ✅ D. true true false true ❌ E. false true true true ❌ F. true false false true ❌ G. The code does not compile ❌ H. None of the above
Explanation: On line 15, we have a compile-time constant that automatically gets placed in the string pool as "rat1" . On line 16, we have a more complicated expression that is also a compiletime constant. Therefore, first and second share the same string pool reference. This makes line 18 and 19 print true. On line 17, we have a String constructor. This means we no longer have a compile-time constant, and third does not point to a reference in the string pool. Therefore, line 20 prints false . On line 21, the intern() call looks in the string pool. Java notices that first points to the same String and prints true.
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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.
The S&P 500 slumped 1.8% on Monday and Tuesday, thanks to China Evergrande, the Chinese property company that looks like it is ready to default on its more-than $300 billion in debt. Cries of the next Lehman Brothers—or maybe the next Silverado?—echoed through the canyons of Wall Street as investors prepared for the worst.
