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How to determine an object's class?

If class B and class C extend class A and I have an object of type B or C , how can I determine of which type it is an instance? ...
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Get index of element as child relative to parent

Let's say I have this markup: 6 Answers 6 ...
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How to check whether a string is a valid HTTP URL?

There are the Uri.IsWellFormedUriString and Uri.TryCreate methods, but they seem to return true for file paths etc. 9...
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PreparedStatement with list of parameters in a IN clause [duplicate]

How to set value for in clause in a preparedStatement in JDBC while executing a query. 15 Answers ...
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How to resolve symbolic links in a shell script

Given an absolute or relative path (in a Unix-like system), I would like to determine the full path of the target after resolving any intermediate symlinks. Bonus points for also resolving ~username notation at the same time. ...
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Smooth scrolling when clicking an anchor link

I have a couple of hyperlinks on my page. A FAQ that users will read when they visit my help section. 29 Answers ...
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How to get a list of current open windows/process with Java?

Does any one know how do I get the current open windows or process of a local machine using Java? 14 Answers ...
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Copy entire contents of a directory to another using php

I tried to copy the entire contents of the directory to another location using 15 Answers ...
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How do I compare two DateTime objects in PHP 5.2.8?

Having a look on the PHP documentation, the following two methods of the DateTime object would both seem to solve my problem: ...
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What is the rationale behind having companion objects in Scala?

Is there a case where a companion object (singleton) for a class is needed? Why would I want to create a class, say Foo and also create a companion object for it? ...