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Why does InetAddress.isReachable return false, when I can ping the IP address?
...achine
// openPort = 22 - ssh, 80 or 443 - webserver, 25 - mailserver etc.
try {
try (Socket soc = new Socket()) {
soc.connect(new InetSocketAddress(addr, openPort), timeOutMillis);
}
return true;
} catch (IOException ex) {
return false;
}...
What is difference between CrudRepository and JpaRepository interfaces in Spring Data JPA?
...with additional methods like flush(), saveAndFlush(), and deleteInBatch(), etc.
Return type of saveAll() method is a List.
Use Case - To perform CRUD as well as batch operations, define repository extends JpaRepository.
sha...
Count rows with not empty value
...t by using some extra formulas like containing some concatinate/split/join etc, ill get back to you if i solve it.
– consideRatio
Jan 9 '15 at 23:18
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Why does i = i + i give me 0?
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@oOTesterOo It starts of printing 2, 4 etc but it very quickly reaches the maximum value of the integer and it "wraps around" to negative numbers, once it reaches zero it stays at zero forever
– Richard Tingle
Jun 11 '14 at 2...
How to choose an AES encryption mode (CBC ECB CTR OCB CFB)?
...odium. Using such a library you do not have to care about encryption modes etc. but you have to be even more careful about the usage details than with a higher level abstraction, like never using a nonce twice.
If for some reason you cannot use a high level crypto library, for example because you ne...
What is more efficient: Dictionary TryGetValue or ContainsKey+Item?
...ng out that the actual source is available now. none of the other answers/etc had a link to the actual source :D
– John Gardner
Jun 3 '16 at 17:32
1
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What are best practices for validating email addresses on iOS 2.0
... ; "]", or "\"
Yes, that means +, ', etc are all legit.
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How to split a string in Java
...h needs regular expression construction and matching. Extra array created, etc.
– David
Jan 17 '19 at 23:38
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How can I make a Python script standalone executable to run without ANY dependency?
...staller and others (py2exe, freeze, cython, embedded version of python and etc) still can't handle dependency of the python dynamic library itself at least in the Windows (python*.dll). The dll has dependency on the runtime which HAS TO BE installed separately. After the process you gain the executa...
What is the difference between decodeURIComponent and decodeURI?
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decodeURIComponent will decode URI special markers such as &, ?, #, etc, decodeURI will not.
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