❌ A. num1 == num2 and num3 == num4 ✅ B. num1 == num2 and num3 != num4 ❌ C. num1 != num2 and num3 == num4 ❌ D. num1 != num2 and num3 != num4 ❌ E. The code does not compile ❌ F. A runtime exception is thrown
Explanation: We always thought that whenever two object references are compared using “==”, it always evaluates to “false”. But here Integer caching changes the results. Integer class has a caching range of -128 to 127. Whenever a number is between this range and autoboxing is used, it assigns the same reference. That’s why for value 100, both num1 and num2 will have the same reference, but for the value 500 (not in the range of -128 to 127), num3 and num4 will have different reference.
❌ A. num1 == num2 and num3 == num4 ✅ B. num1 == num2 and num3 != num4 ❌ C. num1 != num2 and num3 == num4 ❌ D. num1 != num2 and num3 != num4 ❌ E. The code does not compile ❌ F. A runtime exception is thrown
Explanation: We always thought that whenever two object references are compared using “==”, it always evaluates to “false”. But here Integer caching changes the results. Integer class has a caching range of -128 to 127. Whenever a number is between this range and autoboxing is used, it assigns the same reference. That’s why for value 100, both num1 and num2 will have the same reference, but for the value 500 (not in the range of -128 to 127), num3 and num4 will have different reference.
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Telegram is riding high, adding tens of million of users this year. Now the bill is coming due.Telegram is one of the few significant social-media challengers to Facebook Inc., FB -1.90% on a trajectory toward one billion users active each month by the end of 2022, up from roughly 550 million today.
What is Telegram?
Telegram’s stand out feature is its encryption scheme that keeps messages and media secure in transit. The scheme is known as MTProto and is based on 256-bit AES encryption, RSA encryption, and Diffie-Hellman key exchange. The result of this complicated and technical-sounding jargon? A messaging service that claims to keep your data safe.Why do we say claims? When dealing with security, you always want to leave room for scrutiny, and a few cryptography experts have criticized the system. Overall, any level of encryption is better than none, but a level of discretion should always be observed with any online connected system, even Telegram.
