Java
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. Net – Convert System:: array to STD:: vector
Does anyone know that cli / Net system:: array is a simple method to convert C STD:: vector, in addition to operating …… -
Java – Tomcat configuration using DBCP
After a few seconds, we receive a communicationsexception (from DBCP) The error message (in the exception) is the end …… -
Should I reset the Java heap space after use?
I'm using some modeling algorithms in R, one of which runs in Java (bartmachine) I found that before running the model…… -
Strange java time zone date conversion problem
I want to convert ms-since-1970-timestamp to a date with time zone (Germany) These are two variations of the code – at…… -
Is there any way to use Java similar to array and can use its custom classes?
Using Java, is there any way to make a custom class use [] accessors like arrays? Normal array int[] foo = int[5]; foo…… -
Java: nested recursive generics
I have a set of classes that extend some basic entities Classes in this collection can also extend each other to creat…… -
Java – Android GC considerations – when does the GC run and can track its running status from the code?
I've been looking for some detailed design documents describing the architecture of Dalvik VM garbage collector, but I…… -
Easy in Java
Make sure it's an easy person who sees it first! Why code in Java long one = 1 << 0; long thirty = 1 <<…… -
Elastic search – integration with Java Web Applications
I am developing a Java Web application (ERP system) I have finished the basic process Now, according to my customer's …… -
Java – natural language processing – features of text classification
So I try to use Weka SVM to classify text So far, the feature vector I used to train SVM consists of TF-IDF statistics…… -
Java – how do I handle uppercase or lowercase in JSR 310?
There is already an answer to this question: > how to parse case insensitive strings with jsr310 datetimeformatter?…… -
In javax Importing maps in the scripting JavaScript environment
I'm in javax Some strange behaviors are seen in the scripting map implementation The online example shows an example o…… -
Java – Cross Platform file path construction and representation
I'm in the refactoring phase of my ongoing project and want to make some improvements on how I build and represent fil…… -
Java – check whether a file is an image
I am using Jai and creating a file: PlanarImage img = JAI.create("fileload",myFilename); If the file exists, I check t…… -
cmd. exe powershell HashTable
Using CMD When exe is called, is there a method in the power shell that can pass hashtable as a parameter? I want to c…… -
How do I extend the test timeout in circleci?
I run some tests in circleci, some tests take longer, and then 10 minutes, because its UI tests run on headless browse…… -
Java 8 – ternary operator return function not compiled
Can anyone tell me why not compile? public class TestClass { private boolean doThis = false; protected void …… -
Java – Hibernate: standards and collections
I have a question about hibernate and criteria I have two classes: public class Place{ long id; String name; …… -
Java – stackoverflowerror when calling recursively
The problem is a strict theory, but I can't find the answer Consider this short procedure: public class SBtst { i…… -
Java – cross reference and garbage collection
There is an extensive object graph application The graph mainly consists of a set of subgraphs connected to the rest o…… -
Java – spring security configuration error: beans have the same ‘order’ value
I have a web application in which I implement spring security, my spring security XML is <?xml version="1.0" encodi…… -
Java – JSP El: dynamically create attribute names
See the English answer > how to get value of bean property when property name itself is a dynamic variable1 I have …… -
Java – make Jfilechooser display image thumbnail
I want to create a Jfilechooser with a thumbnail view of the image file So I subclass fileview and zoom in the method …… -
What is the reason for this strange Java behavior?
I want to test the '= =' operator on long. This is what I found: the following code: public static void main(final Str…… -
Java – how to set the direction of jtextarea from right to left (in joptionpane)
I have JScrollPane and jtextarea. I try to set the direction of jtextarea from right to left, so the text will start f…… -
Manage java version compatibility
I read "jdks are generally forward compatible, and jres are generally backward compatible" What version checks do java…… -
Java – redirect timeout after httpsession
I've been reading many posts on this topic, but I can't get a solution for my example I am using Java EE 6 and JSF 2.0…… -
Java instanceof and class name
I just asked this curiously. Maybe it's meaningless When we use instanceof in Java, for example: if (a instanceof Pare…… -
Java – how do I access static members in a velocity template?
I don't know if there is a way to do this in velocity: I have a user POJO, an attribute called status. It looks like a…… -
What is the main difference between the optional Scala option of Java 8 and Haskell’s may?
I've read several articles about the upcoming optional types in Java 8, and I want to know why people keep suggesting …… -
Java – is entitymanager really thread safe?
I'm talking about the basic usage here: @Stateless public class BookServiceBean implements BookService { @Persistenc…… -
Java – under what conditions do we need to use composite keys in the database
I've seen that we can use compound keys, where the primary key consists of a combined primary key of two tables Like p……