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What is the purpose of mock objects?

I am new to unit testing, and I continously hear the words 'mock objects' thrown around a lot. In layman's terms, can someone explain what mock objects are, and what they are typically used for when writing unit tests? ...
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How to concatenate two numbers in javascript?

... Ok so, suposing the values 5 and 6 are in two variables: var1 = 5; var2 = 6; will it still work – Heidi Nov 12 '09 at 17:03 4 ...
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Libraries do not get added to APK anymore after upgrade to ADT 22

I have a rather big Android App project that is referencing several library projects. Everything was fine until i upgraded the eclipse ADT plugin to the newest version (v22). I also upgraded the SDK of course. I do not see any compile errors in eclipse, but when i run the project on the phone i get ...
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Difference between freeze and seal

I just heard about the JavaScript methods freeze and seal , which can be used to make any Object immutable. 8 Answers ...
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How to get the ThreadPoolExecutor to increase threads to max before queueing?

... this limitation in ThreadPoolExecutor where the queue needs to be bounded and full before more threads will be started. I believe I have finally found a somewhat elegant (maybe a little hacky) solution to this limitation with ThreadPoolExecutor. It involves extending LinkedBlockingQueue to have ...
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HTTP vs HTTPS performance

Are there any major differences in performance between http and https? I seem to recall reading that HTTPS can be a fifth as fast as HTTP. Is this valid with the current generation webservers/browsers? If so, are there any whitepapers to support it? ...
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Library? Static? Dynamic? Or Framework? Project inside another project

I have an existing iOS app and want to add a large chunk of code that I've been developing as another project just for ease of testing. The new chunk basically deals with saving an image to various sharing services, etc.. Because that sharing code needs a lot of testing and future updating, I was wo...
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How to “return an object” in C++?

...t of the problem (I know the difference between having things on the stack and putting them on the heap). 8 Answers ...
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What is the difference between shallow copy, deepcopy and normal assignment operation?

...wards the existing object. The docs explain the difference between shallow and deep copies: The difference between shallow and deep copying is only relevant for compound objects (objects that contain other objects, like lists or class instances): A shallow copy constructs a new compo...
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What does it mean to “program to an interface”?

I have seen this mentioned a few times and I am not clear on what it means. When and why would you do this? 32 Answers ...