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Is there a way to instantiate objects from a string holding their class name?
... runtime. You can use a map to do that mapping yourself, though:
template<typename T> Base * createInstance() { return new T; }
typedef std::map<std::string, Base*(*)()> map_type;
map_type map;
map["DerivedA"] = &createInstance<DerivedA>;
map["DerivedB"] = &createInstanc...
Do I need elements in persistence.xml?
...tence.xml has a jar-file that you can use. From the Java EE 5 tutorial:
<persistence>
<persistence-unit name="OrderManagement">
<description>This unit manages orders and customers.
It does not rely on any vendor-specific features and can
theref...
Why are functions and methods in PHP case-insensitive?
...s, then loop tags, functions, etc. At no point did I think I was writing a scripting language. I was simply adding a little bit of functionality to the macro replacement parser. I was still writing all my real business logic in C.
I have read somewhere that since all the functions introduced essent...
Bootstrap 3 Navbar with Logo
I want to use the Bootstrap 3 default navbar with an image logo instead of text branding. What's the proper way of doing this without causing any issues with different screen sizes? I assume this a common requirement, but I haven't yet seen a good code sample. A key requirement other than having acc...
How to convert hashmap to JSON object in Java
...ou can use:
new JSONObject(map);
Caution: This will only work for a Map<String, String>!
Other functions you can get from its documentation
http://stleary.github.io/JSON-java/index.html
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How to scroll to an element inside a div?
...le (in pixels).
Now we tell the div to scroll to that position using scrollTop:
document.getElementById('scrolling_div').scrollTop = topPos;
If you're using the prototype JS framework, you'd do the same thing like this:
var posArray = $('element_within_div').positionedOffset();
$('scrolling_div...
Logging request/response messages when using HttpClient
... : base(innerHandler)
{
}
protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
Console.WriteLine("Request:");
Console.WriteLine(request.ToString());
if (request.Content != ...
How can I read and parse CSV files in C++?
...s of code (OK 14 ->But its only 15 to read the whole file).
std::vector<std::string> getNextLineAndSplitIntoTokens(std::istream& str)
{
std::vector<std::string> result;
std::string line;
std::getline(str,line);
std::stringstream lineStrea...
To draw an Underline below the TextView in Android
...3rd Approach
Make use of Html.fromHtml(htmlString);
String htmlString="<u>This text will be underlined</u>";
mTextView.setText(Html.fromHtml(htmlString));
OR
txtView.setText(Html.fromHtml("<u>underlined</u> text"));
...
Convert JSON to Map
...son-databind/#5-minute-tutorial-streaming-parser-generator), you'd do:
Map<String,Object> result =
new ObjectMapper().readValue(JSON_SOURCE, HashMap.class);
(where JSON_SOURCE is a File, input stream, reader, or json content String)
...