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How can I turn a List of Lists into a List in Java 8?
...ct>> , how can I turn that into a List<Object> that contains all the objects in the same iteration order by using the features of Java 8?
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Must JDBC Resultsets and Statements be closed separately although the Connection is closed afterward
It is said to be a good habit to close all JDBC resources after usage. But if I have the following code, is it necessary to close the Resultset and the Statement?
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What is tail recursion?
...return x;
} else {
return x + recsum(x - 1);
}
}
If you called recsum(5), this is what the JavaScript interpreter would evaluate:
recsum(5)
5 + recsum(4)
5 + (4 + recsum(3))
5 + (4 + (3 + recsum(2)))
5 + (4 + (3 + (2 + recsum(1))))
5 + (4 + (3 + (2 + 1)))
15
Note how every recur...
Handling warning for possible multiple enumeration of IEnumerable
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The problem with taking IEnumerable as a parameter is that it tells callers "I wish to enumerate this". It doesn't tell them how many times you wish to enumerate.
I can change the objects parameter to be List and then avoid the possible multiple enumeration but then I don't get the highes...
How to remove item from list in C#?
...== 2);
resultList.Remove(itemToRemove);
When you are not sure the item really exists you can use SingleOrDefault. SingleOrDefault will return null if there is no item (Single will throw an exception when it can't find the item). Both will throw when there is a duplicate value (two items with the s...
Disable ONLY_FULL_GROUP_BY
I accidentally enabled ONLY_FULL_GROUP_BY mode like this:
26 Answers
26
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How to select lines between two marker patterns which may occur multiple times with awk/sed
... @KasunSiyambalapitiya: Mostly it means I like to use it. Formally, it specifies that the next argument is (part of) the script that sed should execute. If you want or need to use several arguments to include the entire script, then you must use -e before each such argument; otherwise,...
When would I use XML instead of SQL? [closed]
... would be more useful than the approach I've always used, which is storing all of my data in a (My)SQL database and then using PHP/Python/etc. to work with it on the web as needed.
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UI Terminology: Logon vs Login [closed]
...nce you're looking for correctness,
login, logout, logon, and logoff are all nouns:
"Please enter your login credentials."
"I see three logons but only two logoffs from this user."
The corresponding verbs are each two words:
"Please log in to see your reputation."
"You must log off and talk to...
How to get current user, and how to use User class in MVC5?
... edited Feb 22 at 17:23
Callum Watkins
2,22222 gold badges2323 silver badges4040 bronze badges
answered Aug 26 '13 at 19:15
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