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JNI converting jstring to char *
I have passed a URL string from Java to C code as jstring data type through the use of JNI. And my library method needs a char * as url.
...
Why does C++ not have reflection?
...or can be
inlined and thus removed entirely
from the compiled code. C# and Java
make a lot of guarantees about the
output of the compiler. If I define
a class in C#, then that class will
exist in the resulting assembly.
Even if I never use it. Even if all
calls to its member functions could
be inlin...
What is the difference between the HashMap and Map objects in Java?
...of getMap() method each time.
But if you use the polymorphism feature of Java, and instead of returning specific classes, use the interface Map, it improves code reusability and reduces the impact of requirement changes.
s...
C++ IDE for Linux? [closed]
...:
For Python development, there’s PyCharm
For R, there’s RStudio
For JavaScript and TypeScript, there’s Visual Studio Code (which is also a good all-round editor)
And finally, many people love the Sublime Text editor for general code editing.
Keep in mind that this list is far from complet...
What is a good use case for static import of methods?
...y one or two members, import them individually.
(https://docs.oracle.com/javase/8/docs/technotes/guides/language/static-import.html)
There are two parts I want to call out specifically:
Use static imports only when you were tempted to "abuse inheritance". In this case, would you have been tempt...
Alternatives to JavaScript
...age, and the de-facto standard for DOM tree manipulation in the browser is JavaScript. It looks like it has deep design issues that make it a minefield of bugs and security holes for the novice.
...
How to check if a char is equal to an empty space?
...ol codes, and some other Unicode characters in higher code planes; see the javadoc for Character.isWhitespace(char).
What you wrote was this:
if (Equals(ch, " ")) {
// ...
}
This is wrong on a number of levels. Firstly, the way that the Java compiler tries to interpret that is...
Convert seconds value to hours minutes seconds?
...
Something really helpful in Java 8
import java.time.LocalTime;
private String ConvertSecondToHHMMSSString(int nSecondTime) {
return LocalTime.MIN.plusSeconds(nSecondTime).toString();
}
...
Where should I put the log4j.properties file?
... WEB-INF\lib
Test if log4j was loaded: add -Dlog4j.debug @ the end of your java options of tomcat
Hope this will help.
rgds
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Lock, mutex, semaphore… what's the difference?
... not stored -- any thread in the set may be chosen to be the next owner.
Java (java.util.concurrent)
A lock (java.util.concurrent.ReentrantLock) is mostly the same as C/C++ pthread_mutex_t's, and Python's threading.RLock in that it also implements a reentrant lock. Sharing locks between processe...