How to close telnet terminal in Linux and Windows (quit, exit not working)? Example

The telnet is one of the most useful Linux networking commands, which is used to check if a server is listening on a particular port and it's whether up and running or not, but it's a little bit tricky to use, especially, if you are not using it on daily basis. Though I have used telnet before, when I use it after a long time, I actually forgot how to close the telnet terminal and how to get out of it. I tried every possible  Linux commands I can think of which is used to close, cancel a command, or exit from VIM editor in UNIX, like  Ctrl + C, quit, exit, q! and even the escape character '^]', only to realize that nothing is working. It may sound silly that an experienced developer cannot even come out of a telnet terminal but this is a true story. 

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Why use Underscore in Numbers from Java? Underscore in Numeric Literals Example

JDK 1.7 release had introduced several useful features, despite most of them being syntactic sugar, there use can greatly improve readability and code quality. One such feature is the introduction of underscores in numeric literals . From Java 7 onwards you can write a long digit e.g. 10000000000 to a more readable 1 0_000_000_000 in your Java source code. One of the most important reasons for using an underscore in numeric literal is avoiding subtle mistakes that are hard to figure out by looking at code. It's hard to notice a missing zero or extra zero between 10000000000 and 1000000000 , than 10_000_000_000 and 1_000_000_000 .
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3 ways to convert String to Boolean in Java? Examples

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Coursera's TensorFlow: Advanced Techniques Specialization Review [2022]

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