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What is Double Brace initialization in Java?
...ialiser block within that class (the inner braces). e.g.
new ArrayList<Integer>() {{
add(1);
add(2);
}};
Note that an effect of using this double brace initialisation is that you're creating anonymous inner classes. The created class has an implicit this pointer to the surrounding out...
Is there a more elegant way of adding an item to a Dictionary safely?
... One thing I think is worth noting that if you are storing an int, dict[key] += amount will not work if the key doesn't exist
– Chris S
Oct 1 '19 at 8:36
add a co...
Spring classpath prefix difference
...nf folders in all your jars on the classpath will be picked up and joined into one big application context.
In contrast, classpath:conf/appContext.xml will load only one such file... the first one found on your classpath.
...
Row count with PDO
... to issue a SELECT
COUNT(*) statement with the same
predicates as your intended SELECT
statement, then use
PDOStatement::fetchColumn() to
retrieve the number of rows that will
be returned. Your application can then
perform the correct action.
EDIT: The above code example uses a prepa...
Java JUnit: The method X is ambiguous for type Y
... ...
What this error means is that you're passing a double and and Double into a method that has two different signatures: assertEquals(Object, Object) and assertEquals(double, double) both of which could be called, thanks to autoboxing.
To avoid the ambiguity, make sure that you either call asser...
C++ : why bool is 8 bits long?
...Because every C++ data type must be addressable.
How would you create a pointer to a single bit? You can't. But you can create a pointer to a byte. So a boolean in C++ is typically byte-sized. (It may be larger as well. That's up to the implementation. The main thing is that it must be addressable,...
Resolving javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path
...ot access. Click on the HTTPS certificate chain (there is lock icon in the Internet Explorer), click on the lock to view the certificate.
• Go to “Details” of the certificate and “Copy to file”. Copy it in Base64 (.cer) format. It will be saved on your Desktop.
• Install the certificate ...
Intel HAXM installation error - This computer does not support Intel Virtualization Technology (VT-x
...Microsoft's side. You are right to say something smells fishy but if it is intentional, Microsoft is just slow at updating the HyperV virtualization layer that is supposed to detect the processor capabilities and expose the Intel-VT features to whatever OS is residing above Hyper-V.
...
What is the direction of stack growth in most modern systems?
...so include a circular buffer of register-windows that are valid and cached internally, with traps when that over/underflows. See here for details. As the SPARCv8 manual explains, SAVE and RESTORE instructions are like ADD instructions plus register-window rotation. Using a positive constant inste...
std::back_inserter for a std::set?
...omparator of the set. Use std::inserter and pass it .begin():
std::set<int> s1, s2;
s1 = getAnExcitingSet();
transform(s1.begin(), s1.end(),
std::inserter(s2, s2.begin()), ExcitingUnaryFunctor());
The insert iterator will then call s2.insert(s2.begin(), x) where x is the value pa...