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Is iterating ConcurrentHashMap values thread safe?
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What does it mean?
That means that each iterator you obtain from a ConcurrentHashMap is designed to be used by a single thread and should not be passed around. This includes the syntactic sugar that the for-each loop provides.
What happens if I try to iterate the map with two thre...
What is the purpose of fork()?
...mple usages of fork:
Your shell uses fork to run the programs you invoke from the command line.
Web servers like apache use fork to create multiple server processes, each of which handles requests in its own address space. If one dies or leaks memory, others are unaffected, so it functions as a m...
How to manually deprecate members
... tvOS, * for all, etc.).
You can also specify the version of the platform from which it was introduced, deprecated, obsoleted, renamed, and a message :
@available(iOS, deprecated:6.0)
func myFunc() {
// calling this function is deprecated on iOS6+
}
Or
@available(iOS, deprecated: 6.0, obsol...
Purpose of #!/usr/bin/python3
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That's called a hash-bang. If you run the script from the shell, it will inspect the first line to figure out what program should be started to interpret the script.
A non Unix based OS will use its own rules for figuring out how to run the script. Windows for example will...
How to detect my browser version and operating system using JavaScript?
...-date, unless you use some sort of global database to get that information from; since this is entirely proprietary. Maybe some day, Google, W3 etc. will offer an API to crowdsource and make publicly available all the different system names and their relations that they gather from their users.
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What's an object file in C?
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An object file is the real output from the compilation phase. It's mostly machine code, but has info that allows a linker to see what symbols are in it as well as symbols it requires in order to work. (For reference, "symbols" are basically names of global ...
Convert integer to binary in C#
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Convert from any classic base to any base in C#
String number = "100";
int fromBase = 16;
int toBase = 10;
String result = Convert.ToString(Convert.ToInt32(number, fromBase), toBase);
// result == "256"
Supported bases are 2, 8,...
Why doesn't String switch statement support a null case?
...throws NullPointerException ? See the commented line below (example taken from the Java Tutorials article on switch ):
9 ...
How to convert byte array to string [duplicate]
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This is wrong. From the code in the question, the encoding is UTF8, the default for BinaryWriter.
– Tom Blodget
Feb 13 '16 at 2:19
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Convert ArrayList to String[] array [duplicate]
...ining a primitive type object, e.g. Double, Float, Integer, Long. And then from there your normal arrays must be defined with this type, e.g. Double[] myDoubleArray = list.toArray(new Double[listOfDoubles.size()]);
– planty182
Sep 5 '13 at 13:03
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