Java
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JPA – jpql query select optional general Dao selection
I have retrieved the category object according to a valid JPA example: return (ArrayList<Category>) getEntityMan…… -
Java – send invalid XML characters in soap request
I want to send special (&, '(single quotation mark)) characters in soap request I use axis 1.4 The web service cli…… -
Java – unable to obtain the jdbc driver of MySQL in Tomcat environment
I've been trying to get the driver class connected to MySQL's JDBC bash-3.2$echo $CLASSPATH /home/cmao/public_html/jsp…… -
Static and overlay in Java
public class B { static int i =1; public static int multiply(int a,int b) { return i; } …… -
Java – optional jar wrapper
I have a small program Jar, which uses a huge library A small part of the jar Is there a tool to repackage several can…… -
The frequency response is calculated from the filter coefficients
I can't find any understandable information about the subject On Wikipedia in the Netherlands, I found that you can ap…… -
Java – if we don’t generate windows, why doesn’t timer work?
This is the code: import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JFrame;…… -
What’s the difference between Java – serialized objects because they can persist?
We know that serializable is a tag interface (that is, an interface without any methods) So I want to know how to impl…… -
Java – the difference between Max heap and sort stack
I want to know when we can use collections Why do we need a new data structure like Max heap when sort method sorts th…… -
Java – does the runtime match o (nlogn)?
I wrote a class (greedy strategy). At first, I used the sorting method with O (nlogn) Then I used the binary search tr…… -
Extract the zip file in the BlackBerry Java app
I'm trying to write code to unzip the zip archive and put the output in another folder Do I have to use a third-party …… -
Java – how to get the instance number
Is there any way to get the instance number or ID? I mean, you can see it in the eclipse debug > variables window a…… -
Java, wait for the child process to exit
Using Java's processbuilder, I'm creating a set of subprocesses I can use the waitfor () method in the generated proce…… -
Java – part of my layout moves up with the keyboard
My Android application has such a layout. When I open the keyboard, two imageviews are displayed on the keyboard at th…… -
Java – extract subgraphs from drawings using Jun?
I have a big picture. I'm using Jung I wonder if Jung provides a way to extract the two hop neighborhood of a vertex (…… -
How to convert Java util. The date object is converted to a restricted form of the canonical representation of datetime
I need to put Java util. The date variable is converted to a representation similar to the following 1995-12-31T23:59:…… -
Creating jar files for Java applications
I created a Java application that uses the data in its config folder. It also uses a third-party jar file located in t…… -
How to delete drawing lines in Java?
The question is how to delete old rows? I mean, only the current X and Y lines are displayed on the screen, so that th…… -
Java – why are exception error strings different in different environments?
I have this code to handle catching specific exceptions private static final String CONNECTION_REFUSED_EXCEPTION = "ja…… -
java – Webdriver showModalDialog
We use webdriver for functional testing However, our application uses the showModalDialog JS function to open a pop-up…… -
Java – how to read international characters from the console
How to read international characters from the console in Java? Solution Using Java io. Console class, just like any ot…… -
Java – how to add a throws exception clause when implementing a defined method in an interface without a throws clause?
I need a class to browse the collection, and then I implement the iterator interface The only exception thrown by next…… -
Java – any website / book / technique for practicing recursion and OO design?
I just want to know if any websites have problems practicing recursion and OO design (given some entities that design …… -
Can java process delete loaded jars?
Hello, I have the following questions: During the unloading process, I loaded a jar (JDBC Driver) URL pDriverJar = jar…… -
Java – Android random number
I generate a random card from the array And assign it. " public void rand() { String rank[]= {"tclub1.png","tclub…… -
How to see whether two Java queues are equal according to the content value of each queue?
I want to implement an equals override, which compares two Java queue objects based on them, and the contents of each …… -
Servlets – how do I specify filter priority in a Java Web application?
Hello, I hope I can define two such filters <filter-mapping> <filter-name>SecurityFilter</filter-na…… -
How to use POSIX in Java_ spawn()
I inherited a legacy application that uses process builder Start() executes the script on the Solaris 10 server Unfort…… -
Java – fillroundrect appears to be a problem that cannot be rendered correctly
I have a very simple image generator program. It just draws a rounded rectangle on the buffered image, and then saves …… -
Java – search for tags and save the text between tags as variables
I'm new to Java, but how to search for tags in files, and then all the contents between tags (such as a string of text…… -
Java – how can I repackage a jar file that contains all the dependencies?
I'm developing an application that should run independently However, this project involves a project with a large numb…… -
Java – Liferay JUnit mockito test
I'm trying to test my Liferay portlet plug-in code using JUnit and mockito At present, I am simulating the service imp……