包含标签：Java 的文章
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Java – why should I use URL Openstream instead of URL getContent？
I want to search the content of a website html_content = urllib.urlopen("http://www.test.com/test.html").read() In the…… -
Java – persistent error message: an instance of an empty PK was incorrectly provided for the lookup operation
I'm trying to use NetBeans 7.01 to learn JSF 2.0 and JPA tutorials I am using Oracle Xe and JDBC_ 6. I used the JSF pa…… -
Java – a substitute for hibernate or TopLink?
Is there a viable alternative to hibernate? Things that are not based on JPA are preferred Our problem is that we are …… -
Java – HQL, where in indicates an empty list crash
I have an HQL statement like this: Select cast(ed.employee.employeeID as int) AS emp_id FROM Education AS ed WHERE ed.…… -
Java – spring AOP: @ annotation (annotation)
I (of course) try to maintain the project with many structures I don't know very well In trying to figure out the use …… -
Java – are there any side effects of using many static functions?
At present, I am very interested in game framework because it can promote faster development When I see the code, ther…… -
Java – create a custom tag library that extends the spring tag library
I want to create a custom tag library that should extend the existing spring MVC 3.0 tag library I want to do this bec…… -
Java – which continuous integration library do you use?
I used cruise control as the CI framework in my last project (I didn't find CruiseControl lacking, I just want to know…… -
Java – add date string 1 day
I have a date string newdate = "31.05.2001" I must add one day I tried the following code: String dateToIncr = "31.12.…… -
Is java heap memory continuous?
I've seen people comment that Java heap memory is continuous, and people say the opposite So, can someone give me a fi…… -
Java: how to cancel application exit
In one of my programs, I want to display a dialog when the user tries to exit the application The user must then choos…… -
Reinsert Na into vector
I have a value vector containing Na These values need to be processed by an external program that cannot process Na, s…… -
Java – why can’t I access my panel’s getWidth () and getHeight () functions?
I'm writing a simple program to test the basic GUI The program prints a letter in the middle of the screen, allowing t…… -
Bit level operations in Java
I'm trying to do something in Java to apply masks, representation sets, etc int one=1; int two=2; int andop=1&2; S…… -
Java – mongodb upsert exception invalid bson field
This exception: Exception in thread "Thread-1" java.lang.IllegalArgumentException: Invalid BSON field name id at o…… -
Multithreading – how do I make Perl threads without copying all variables?
I have a Perl program that would be very useful to use some form of parallelism But I have a lot of data in variables,…… -
Java – references files through classpath in the context of spring
I'm trying to set up org springframework. beans. factory. config. Propertyplaceholderconfigurer spring bean. I have JD…… -
Java – gradle compiles but does not run TestNG tests
We just started using gradle and TestNG in our project, so I'm checking if there are actually no test failures I was s…… -
Java – xssfcellstyle setfillforeroundcolor and setfillbackgroundcolor do not work
I try to use setfillforeroundcolor and setfillbackgroundcolor to change the cell color of Excel file But I failed. I r…… -
Maximum limit for Java arrays
I tried to create a 2D array in Java, as follows: int[][] adjecancy = new int[96295][96295]; But it failed with the fo…… -
Java – do you have to know the machine architecture for writing code?
Suppose I use Java or Python or C programming to solve a simple problem, which may be to build a TCP / UDP loopback se…… -
When to use flush () in Java?
import java.io. * ; import java.io. * ; public class Ser { public static void main(String args[]) { try …… -
Why is the runtime exception “unchecked” in Java?
Why are runtime exceptions unchecked meaningful (not if they are checked)? Solution If you do not, you must use the tr…… -
Generate Java dump when OUTOFMEMORY
I have a program that should eventually generate OUTOFMEMORY public class VeryLargeObject implements Serializable { …… -
Java – lwjgl cannot find the display class
I have installed lwjgl into the Java project. I can't import the display class import org.lwjgl.opengl.display; An uns…… -
What are some prominent real-world applications of Java?
I am a beginner programmer. The I & CS course in our school let us start learning Java In my opinion, C and its se…… -
Is there a correct way to check the existence of files / directories in Java?
Code: String dir = //Path to the directory File saveDir = new File(dir); //Here comes the existence check if(!saveDir…… -
Swing – why does eventlistenerlist traverse backwards in firefooxxx()?
I don't understand the basic principle of this code, which is taken from javax swing. event. Eventlistenerlist documen…… -
Java – mockito throws an outofmemoryerror in a simple test
I try to use mockito to simulate the database pool (only for retrieving data), but it will run out of memory when runn…… -
Java – double check locking using regular HashMap
Back to concurrency So far, it's clear that for double check locking, variables need to be declared volatile However, …… -
Java – how to prevent hibernate from refreshing in the list?
I have a simple hibernate query, such as: from MyEntity where name = ? It's not fancy, but it's called many times in a…… -
Java swing – JList custom cell rendering – capture operation
Whenever I create a custom cell renderer for JList, any elements I add to it will not respond to the operation For exa……