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When to use StringBuilder in Java [duplicate]
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If you use String concatenation in a loop, something like this,
String s = "";
for (int i = 0; i < 100; i++) {
s += ", " + i;
}
then you should use a StringBuilder (not StringBuffer) instead of a String, because it is much faster and consumes less memory.
If you have a...
In Django, how do I check if a user is in a certain group?
... # save this new group for this example
user = User.objects.get(pk = 1) # assuming, there is one initial user
user.groups.add(group) # user is now in the "Editor" group
then user.groups.all() returns [<Group: Editor>].
Alternatively, and more directly, you can check if a...
Why does Hibernate require no argument constructor?
I got this hand-wavy answer but could somebody explain further? Thanks
9 Answers
9
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How do I POST JSON data with cURL?
...t to test it with cURL. I am trying to post a JSON data. Example data is like this:
24 Answers
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‘ld: warning: directory not found for option’
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You need to do this:
Click on your project (targets)
Click on Build Settings
if your error includes the -L flag, then delete the values in Library Search Paths
if your error includes the -F flag, then delete the values in Framework Search Paths
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SQL update from one Table to another based on a ID match
...e to update any card numbers to the account number, so that I am only working with account numbers.
22 Answers
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Python: How to ignore an exception and proceed? [duplicate]
I have a try...except block in my code and When an exception is throw. I really just want to continue with the code because in that case, everything is still able to run just fine. The problem is if you leave the except: block empty or with a #do nothing, it gives you a syntax error. I can't use con...
Diff Algorithm? [closed]
I've been looking like crazy for an explanation of a diff algorithm that works and is efficient.
5 Answers
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dropping infinite values from dataframes in pandas?
what is the quickest/simplest way to drop nan and inf/-inf values from a pandas DataFrame without resetting mode.use_inf_as_null ? I'd like to be able to use the subset and how arguments of dropna , except with inf values considered missing, like:
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What is the “volatile” keyword used for?
I read some articles about the volatile keyword but I could not figure out its correct usage. Could you please tell me what it should be used for in C# and in Java?
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