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What does “program to interfaces, not implementations” mean?
...
Interfaces are just contracts or signatures and they don't know
anything about implementations.
Coding against interface means, the client code always holds an Interface object which is supplied by a factory. Any instance returned by the factory would...
How many levels of pointers can we have?
...llowing limits: [...]
279 — 12 pointer, array, and function declarators (in any combinations) modifying an
arithmetic, structure, union, or void type in a declaration
The upper limit is implementation specific.
...
How do I find the caller of a method using stacktrace or reflection?
I need to find the caller of a method. Is it possible using stacktrace or reflection?
12 Answers
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Transactions in REST?
...ple items to a shopping basket and then submit that basket to process the order, you can add Bob's account entry to the transaction wrapper and then Bill's account entry to the wrapper. When all the pieces are in place then you can POST/PUT the transaction wrapper with all the component pieces. ...
What is this weird colon-member (“ : ”) syntax in the constructor?
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It's a member initialization list. You should find information about it in any good C++ book.
You should, in most cases, initialize all member objects in the member initialization list (however, do note the exceptions listed at the end of the FAQ entry).
The takeaway point f...
How do you sign a Certificate Signing Request with your Certification Authority?
... set up your CA, and then you sign an end entity certificate (a.k.a server or user). Both of the two commands elide the two steps into one. And both assume you have a an OpenSSL configuration file already setup for both CAs and Server (end entity) certificates.
First, create a basic configuration...
Convert JSON String To C# Object
...his would be most useful in cases where you're dealing with larger objects or JSON Strings.
For instance:
class Test {
String test;
String getTest() { return test; }
void setTest(String test) { this.test = test; }
}
Then your deserialization code would be:
JavaScrip...
xcopy file, rename, suppress “Does xxx specify a file name…” message
... proper flag , but how would I, in one command, copy a file from one directory to another and rename it in the destination directory? Here's my command:
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Is there a command like “watch” or “inotifywait” on the Mac?
...swatch
fswatch is a small program using the Mac OS X FSEvents API to monitor a directory.
When an event about any change to that directory is received, the specified
shell command is executed by /bin/bash
If you're on GNU/Linux,
inotifywatch (part of the
inotify-tools package on most distributions...
Determining the current foreground application from a background task or service
...ground application can know what the application currently running in the foreground is."
Do NOT use the getRunningAppProcesses() method as this returns all sorts of system rubbish from my experience and you'll get multiple results which have RunningAppProcessInfo.IMPORTANCE_FOREGROUND. Use getRu...