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Java serialization: readObject() vs. readResolve()
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readResolve is used for replacing the object read from the stream. The only use I've ever seen for this is enforcing singletons; when an object is read, replace it with the singleton instance. This ensures that nobody can create another ...
Why is (object)0 == (object)0 different from ((object)0).Equals((object)0)?
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The reason the calls behave different is they bind to very different methods.
The == case will bind to the static reference equality operator. There are 2 independent boxed int values created hence they are not the same reference.
In the second case you bind...
How to save an activity state using save instance state?
I've been working on the Android SDK platform, and it is a little unclear how to save an application's state. So given this minor re-tooling of the 'Hello, Android' example:
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Why are static variables considered evil?
I am a Java programmer who is new to the corporate world. Recently I've developed an application using Groovy and Java. All through the code I wrote used quite a good number of statics. I was asked by the senior technical lot to cut down on the number of statics used. I've googled about the same, ...
What is std::move(), and when should it be used?
...ment operators, they have move assignment operators.)
The move constructor is used instead of the copy constructor, if the object has type "rvalue-reference" (Type &&).
std::move() is a cast that produces an rvalue-reference to an object, to enable moving from it.
It's a new C++ way to avo...
How does Hadoop process records split across block boundaries?
...blockSize)) where maxSize corresponds to mapred.max.split.size and minSize is mapred.min.split.size.
Divide the file into different FileSplits based on the split size calculated above. What's important here is that each FileSplit is initialized with a start parameter corresponding to the offset in t...
In Python, how do I determine if an object is iterable?
Is there a method like isiterable ? The only solution I have found so far is to call
21 Answers
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Accessing an array out of bounds gives no error, why?
I am assigning values in a C++ program out of the bounds like this:
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In Objective-C why should I check if self = [super init] is not nil?
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For example:
[[NSData alloc] initWithContentsOfFile:@"this/path/doesn't/exist/"];
[[NSImage alloc] initWithContentsOfFile:@"unsupportedFormat.sjt"];
[NSImage imageNamed:@"AnImageThatIsntInTheImageCache"];
... and so on. (Note: NSData might throw an exception if the file doesn't ...
How to detect if a function is called as constructor?
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NOTE: This is now possible in ES2015 and later. See Daniel Weiner's answer.
I don't think what you want is possible [prior to ES2015]. There simply isn't enough information available within the function to make a reliable inference....