Java
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Java – why does jmh run different forks?
I use the jmh benchmark framework（ http://openjdk.java.net/projects/code-tools/jmh/ ）Run the benchmark on my code My…… -
Java – how to use POI to set the author name as an excel file
I am using poi (Java) to create an excel (. Xlsx) file After I created the excel file, I saw the excel file as "Apache…… -
Java executorservice pauses / resumes a specific thread
Is there any way to use executorservice to pause / resume a specific thread? private static ExecutorService threadpool…… -
Java – why are we in JSP instead of system out. Write out in println() println()？
I started learning JSP. I saw that if we want to print something in JSP, we must write out Println () instead of syste…… -
Java – recursive BeanUtils describe()
Is there a version of BeanUtils Describe (customer) recursively calls the describe () method to the complex attribute …… -
Java – how to get the line number of a method?
Can I get the line number of using reflection or other magic methods? Solution I want to do the same thing. After some…… -
Java – logger slf4j does not have the level configured with logback
My log record is through logback Configuration of logback using groovy files Now, when my Maven POM project aggregates…… -
Java – what should developers know before developing mobile applications?
I want to start making Android mobile apps as my first choice, but not the only one I have 10 years of experience in J…… -
Java: programmatically determine the names of all packages loaded on the classpath
Any suggestions on how to handle how to find the list of package names that exist in the current classpath? This needs…… -
Java – logger slf4j does not have the level configured with logback
My log record is through logback Configuration of logback using groovy files Now, when my Maven POM project aggregates…… -
java – Objects. Requirenonnull (t obj) instead of null check and throw illegalargumentexception manually?
Whenever I check whether the given parameter of a method is not null, if the null check fails, I use it to write a nul…… -
Java robot keyboard command key
VK of command key on MAC_ [key] what is the code? I tried to get a Java robot to press the command key I'm using the c…… -
Java – Maven plugin build failed when using Lambdas
I wrote a maven plugin / mojo to generate some code The plug-in runs well and has built-in Java JDK 1.8 I see some str…… -
Java generics and wildcards are compiled in eclipse, but not in javac
As a follow-up Java genetics compile in eclipse, but not in javac, I released another code segment compiled and runnin…… -
Java – smack client – the user is still online even though the connection is aborted
I use smack to build a small XMPP client / BOT to experience a very strange behavior I set up a connection and a conne…… -
Multiply by two vectors – I want a scalar, but I get a vector?
This is my code: a <-c(1,2,3) b <-t(a) print(a*b) I expect the result to be 14, because the multiplication of th…… -
Java – returns a string from JMS
I'm writing an independent main method that calls a producer (pushing data into a queue) and then calls a consumer who…… -
Array – the goal of combining LinkedList with string reverse is to understand LinkedList
I tried to use a link list program to display the reverse string entered by the user Here is my program to reverse the…… -
Java – use Apache POI to read the contents of the drop-down list from excel
I need to create a drop-down list (data validation) on a specific cell in the excel worksheet and read it back With th…… -
ORM – non destructively delete entities in symfony2
Is there a good, clean and simple way to delete entities non destructively in symfony 2? I want the administrator to h…… -
How to monitor available memory (including cache and cache) in Java?
I have searched for possible solutions, such as how to monitor the computer's CPU, memory, and disk usage in Java But …… -
Java – how do I associate a string with each member of an enumeration?
Suppose I have some enumerations as follows: enum Towns { Rome,Napoli,Modena } I want to associate a string with each …… -
Java – can I double or BigDecimal overflow?
Java 8 gave us math Addexact() is an integer, but not a decimal Can double and BigDecimal overflow? According to doubl…… -
Java process memory grows infinitely Memory leak?
We have a java process running on Solaris 10, serving about 200-300 concurrent users Administrators have reported that…… -
Java – publish AAR files to Maven central, gradle does not work
Publishing a file to Maven central and gradle still doesn't work: OK, let's restate all the steps I follow and try to …… -
Java – how to use Apache POI to select and bold the entire worksheet
I am a beginner of Apache POI library In VBA, I know I can use the following code to select and bold the entire worksh…… -
Java method call performance
I have this code to do range minimum query When t = 100000, I and j always change in each input line, and its executio…… -
Will JavaFX 8 implement text field validation support?
JavaFX 2 does not provide validation support (mask, input filtering, etc.) It is difficult to adopt technologies that …… -
Java – add API baselines in eclipse
Compiling the eclipse source library I tried to add API baseline, but I don't know how to add it or add it What are AP…… -
How does the Haskell function Guardian manipulate other values instead of function parameters?
In http://lisperati.com/haskell/ht4.html The author shows the function of reading polygons from a simple SVG file I un…… -
Java int concurrency int is equivalent to atomicinteger incrementAndGet()？
Are these two equivalent? In other words, is the and - Operator atomic? int i = 0; return ++i; AtomicInteger ai = new…… -
The Java – freemaker template checks whether the sequence is empty
I want to check whether the sequence is empty in the freemaker template This fragment is used to check whether the seq……