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What is the difference between an interface and abstract class?
...e more expensive to use, because there is a look-up to do when you inherit from them.
Abstract classes look a lot like interfaces, but they have something more: You can define a behavior for them. It's more about a person saying, "these classes should look like that, and they have that in common, s...
C++ “virtual” keyword for functions in derived classes. Is it necessary?
...explicitly, so you may want to use it if only to keep the compiler quiet.
From a purely stylistic point-of-view, including the virtual keyword clearly 'advertises' the fact to the user that the function is virtual. This will be important to anyone further sub-classing B without having to check A'...
An existing connection was forcibly closed by the remote host
...le values together to support multiple protocols. So to support everything from SSL3 to TLS1.2, set SecurityProtocol = (SecurityProtocolType)4080.
– Abacus
Jan 29 '19 at 19:08
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Difference between git stash pop and git stash apply
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git stash pop applies the top stashed element and removes it from the stack. git stash apply does the same, but leaves it in the stash stack.
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How do I make HttpURLConnection use a proxy?
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This is fairly easy to answer from the internet. Set system properties http.proxyHost and http.proxyPort. You can do this with System.setProperty(), or from the command line with the -D syntax.
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Postgres could not connect to server
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Had a similar problem; a pid file was blocking postgres from starting up. To fix it:
$ rm /usr/local/var/postgres/postmaster.pid
$ brew services restart postgresql
and then all is well.
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How to delete an SMS from the inbox in Android programmatically?
...utter, it'd be nice to be able to remove application specific SMS messages from the inbox to reduce the potential overflow of those messages.
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private[this] vs private
In Scala I see such feature as object-private variable. From my not very rich Java background I learnt to close everything (make it private) and open (provide accessors) if necessary. Scala introduces even more strict access modifier. Should I always use it by default? Or should I use it only in som...
Declaring a custom android UI element using XML
... android_text attribute for MyCustomView. Attributes can then be retrieved from the TypedArray using various get functions. If the attribute is not defined in the defined in the XML, then null is returned. Except, of course, if the return type is a primitive, in which case the second argument is ret...
Making code internal but available for unit testing from other projects
...ting used in isolation. Therefore you shouldn't really be testing it apart from testing some other class that makes use of that object internally.
Just as you shouldn't test private members of a class, you shouldn't be testing internal classes of a DLL. Those classes are implementation details of s...