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conversion from string to json object android
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what if the string is an array of JSON objects? Like "[{},{},{}]"
– Francisco Corrales Morales
Jun 17 '14 at 23:18
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How to generate a random alpha-numeric string?
...ric string. In my situation it would be used as a unique session/key identifier that would "likely" be unique over 500K+ generation (my needs don't really require anything much more sophisticated).
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Passing an array to a query using a WHERE clause
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The identifiers are still a quoted list, so it comes out as "WHERE id IN ( '1,2,3,4' )", for example. You need to quote each identifier separately, or else ditch the quotes inside the parentheses.
– Rob
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How do I alias commands in git?
...mand:
$ git config --global alias.st status
On unix, use single quotes if the alias has a space:
$ git config --global alias.ci 'commit -v'
On windows, use double quotes if the alias has a space or a command line argument:
c:\dev> git config --global alias.ci "commit -v"
The alias comma...
GCD to perform task in main thread
...on the main thread, which happens when the corresponding run loop is run.
If you already are on the main thread, the behaviour is the same: the block is scheduled, and executed when the run loop of the main thread is run.
s...
How do I use a custom Serializer with Jackson?
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As mentioned, @JsonValue is a good way. But if you don't mind a custom serializer, there's no need to write one for Item but rather one for User -- if so, it'd be as simple as:
public void serialize(Item value, JsonGenerator jgen,
SerializerProvider provider) thro...
Why would a static nested interface be used in Java?
...blic" on interface methods and "public final" on interface fields - the modifiers are redundant and just add clutter to the source code.
Either way, the developer is simply declaring an interface named Foo.Bar. There is no further association with the enclosing class, except that code which cannot ...
Java Class.cast() vs. cast operator
...t way in this case would be to do an instance of check first like this: if (cls.isInstance(o)){ return cls.cast(o); } Except if you're sure the type will be correct, of course.
– Puce
Jan 19 '12 at 8:57
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std::string to char*
...ar *; you aren't allowed to change the C-style string returned by c_str(). If you want to process it you'll have to copy it first:
std::string str = "string";
char *cstr = new char[str.length() + 1];
strcpy(cstr, str.c_str());
// do stuff
delete [] cstr;
Or in modern C++:
std::vector<char>...
Why does integer overflow on x86 with GCC cause an infinite loop?
...umes you won't cause undefined behavior, and optimizes away the loop test. If you really want wraparound, pass -fwrapv to g++ or gcc when compiling; this gives you well-defined (twos-complement) overflow semantics, but can hurt performance.
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