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How does HashSet compare elements for equality?
...red equal"). This is almost never implemented on the type itself (i.e. Foo doesn't implement IEqualityComparer<Foo>) but in a separate type which is only used for comparisons.
Implement equality in the type itself, by overriding GetHashCode and Equals(object). Ideally, implement IEquatable<...
Change private static final field using Java reflection
.... It may not work because a SecurityManager may be present, but even if it doesn't, depending on usage pattern, it may or may not work.
JLS 17.5.3 Subsequent Modification of Final Fields
In some cases, such as deserialization, the system will need to change the final fields of an object after const...
How to remove all event handlers from an event
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This does not seem to work for ToolStripButtons. I've replaced Button in RemoveClickEvent with ToolStripButton, but the events are still in place after calling RemoveClickEvent. Has anyone a solution for this problem?
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What is an unsigned char?
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This is implementation dependent, as the C standard does NOT define the signed-ness of char. Depending on the platform, char may be signed or unsigned, so you need to explicitly ask for signed char or unsigned char if your implementation depends on it. Just use char if you i...
How to write to an existing excel file without overwriting data (using pandas)?
...nough details: what kind of formulas do you have, how data is updated, how does it brake the formulas. Now I just can't help, too many things I don't know.
– Ski
Nov 27 '13 at 17:22
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How do I iterate over the words of a string?
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This is a poor solution as it doesn't take any other delimiter, therefore not scalable and not maintable.
– HelloWorld
Jan 10 '11 at 3:57
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Get class that defined method
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In Python 2.7 it does not work. Same error about missing 'im_class'.
– RedX
May 23 '16 at 11:54
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How to send an email using PHP?
...t the subject and it seems that Hotmail requires some special header or it does not allow the email to pass their servers... I still didn't find the solution though.
– antf
Nov 5 '14 at 16:47
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How to define custom exception class in Java, the easiest way?
... your class has no constructor, you get the default even if the superclass does not have it.
– Michael Borgwardt
Sep 23 '10 at 8:10
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DatabaseError: current transaction is aborted, commands ignored until end of transaction block?
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This is what postgres does when a query produces an error and you try to run another query without first rolling back the transaction. (You might think of it as a safety feature, to keep you from corrupting your data.)
To fix this, you'll want t...