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How do I use the new computeIfAbsent function?
...urrent.ConcurrentHashMap;
public class Test {
public static void main(String[] s) {
Map<String, Boolean> whoLetDogsOut = new ConcurrentHashMap<>();
whoLetDogsOut.computeIfAbsent("snoop", k -> f(k));
whoLetDogsOut.computeIfAbsent("snoop", k -> f(k));
...
How do you get current active/default Environment profile programmatically in Spring?
...owire the Environment
@Autowired
Environment env;
Environment offers:
String[] getActiveProfiles(),
String[] getDefaultProfiles(), and
boolean acceptsProfiles(String... profiles)
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impr...
Constructor overloading in Java - best practice
...meter of different type on each one? Like - new Object(int aa) / new Objec(String bb) ?
– Botea Florin
Mar 12 '18 at 20:52
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...
Is there a VB.NET equivalent for C#'s '??' operator?
...eturns></returns>
''' <remarks>Usage
''' Dim val as String = "MyVal"
''' Dim result as String = val.Coalesce(String.Empty)
''' *** returns "MyVal"
'''
''' val = Nothing
''' result = val.Coalesce(String.Empty, "MyVal", "YourVal")
''' *** returns String.E...
error: default argument given for parameter 1
...d only be defined in the function declaration.
//bad (this won't compile)
string Money::asString(bool shortVersion=true){
}
//good (The default parameter is commented out, but you can remove it totally)
string Money::asString(bool shortVersion /*=true*/){
}
//also fine, but maybe less clear as th...
How to write an XPath query to match two attributes?
...t;X>
<Y ATTRIB1=attrib1_value ATTRIB2=attrib2_value/>
</X>
string xPath="/" + X + "/" + Y +
"[@" + ATTRIB1 + "='" + attrib1_value + "']" +
"[@" + ATTRIB2 + "='" + attrib2_value + "']"
XPath Testbed:
http://www.whitebeam.org/library/guide/TechNotes/xpathtestbed.rhtm
...
CORS - What is the motivation behind introducing preflight requests?
...change this), but in a world with CORS the preflight mechanism provides an extra 'sanity check' so that clients and servers don't break because the underlying rules of the web have changed.
Servers that are still under development, but which contain a lot of old code and for which it's not feasible/...
How do i instantiate a JAXBElement object?
... parameters.
ObjectFactory factory = new ObjectFactory();
JAXBElement<String> createMessageDescription = factory.createMessageDescription("description");
message.setDescription(createMessageDescription);
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Why is parenthesis in print voluntary in Python 2.7?
..., expr2, ... exprn
(Each expression in turn is evaluated, converted to a string and displayed with a space between them.)
But remember that putting parentheses around an expression is still the same expression.
So you can also write this as:
print (expr1), (expr2), ... (expr3)
This has nothin...
Android; Check if file exists without creating a new one
... This is like that because there is no static method : File.exists(String file) , so you have to instanciate a new File object to access 'Exists' method.
– Giova
Oct 13 '14 at 3:12
...