Java
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How do I know if a Java se class or method is thread safe?
For example: static private DateFormat df = new SimpleDateFormat(); public static void format(final Date date){ fo…… -
Java – COM / MySQL / JDBC / Driver: Unsupported major Minor version 52.0
When I was in Apache Tomcat / 7.0 52 (Ubuntu) deploying my war using MySQL connector - java-6.0 3. Jar encountered thi…… -
The static of Java and the self of ruby
Is it static in ruby, like self in ruby? Solution No, the static nature of Java has nothing to do with Ruby's ego Java…… -
Java – what does the @ modelattribute annotation at the method parameter level mean?
The spring 3 reference tells us: I don't understand this magic spell because I'm sure that the alias of the model obje…… -
Java – wait for the third-party thread to complete
I have a thread running a third-party library, which will also run its own thread When the run method of my thread com…… -
Java – download files using asynctask
I tried to download a file with asynctask, but it didn't work, no error message or nothing, just didn't download the f…… -
Java – weak reference instead of getactivity () (Android avoids memory leakage)?
In order to avoid memory leakage, I wrote the following method, which will be used for activities, mainly for fragment…… -
Java – SQL prepared statement for creating tables
I want to know some methods of dynamically creating tables based on user input (SQL prepared statement) CREATE TABLE ?…… -
java – JAXBElement vs boolean
What exactly is a jaxbelement Boolean value and how to set it to Boolean equivalent to "true"? method: public void set…… -
Java – use pdfbox 1.8 8 visual signature
I'm trying to use visual signatures and pdf@R_486_2419 @Make PDF I have two streams, it seems pdf@R_486_2419 @Only fil…… -
Java – the spring boot rest controller returns 404 when deployed on an external Tomcat 9 server
I have a spring boot rest web application that runs perfectly on an embedded server However, in accordance with the bl…… -
“Cannot reproduce” – is java deterministic multithreading possible?
Can this run multithreaded Java applications in a deterministic manner? I mean, always use the same thread switch in t…… -
What types of encryption are available in Java?
I am implementing the data transfer model in Java I have implemented DES, 3DES and AES in my application. I would like…… -
Returns c# the dictionary in a multithreaded environment
I have announced a dictionary of dictionaries: Dictionary<String,Dictionary<String,String>> values; I have…… -
How to write large byte ByteBuffer to small byte in Java
I currently have a Java ByteBuffer, which already has data in big endian format Then I want to write a binary file as …… -
How to use java to calculate the number of options in the selection drop-down box in selenium webdriver?
I have a selection drop-down list: xpath //*[@id="ddlTablePay"] I need to calculate the number of options in this drop…… -
JavaFX CSS error (attribute style sheet does not exist)
I've just started building JavaFX applications in IntelliJ using the latest Java 7 SDK I have built my interface using…… -
Java – allows you to provide maps for equals comparator and hash functions, respectively
When trying to model polynomials, especially their multiplication, I encountered the following problems During multipl…… -
Flickr API JAVA – flickrj
I want to use Flickr Java API (flickrj) to download a group of photos of specific users in Flickr Does anyone know how…… -
Help use Horner’s rules and hash functions in Java?
I'm trying to convert words to integers using Horner's rules I understand how it works. If the word is long, it may ca…… -
Java import class system
I have a question about class import. If you import a class, you seem to be able to call a method with a reduced line …… -
Java – how to add a gap at the edge of a JButton?
I want to keep the default borders on my jbuttons, but also put a blank area around them I'm using vertical @ r_ 518_ …… -
Java – find the next occurrence of the day of the week in jsr-310
Given a jsr-310 object, such as localdate, how can I find the date of the next Wednesday (or any other day of the week…… -
Filtering lists using java 8 lambda expressions
I have a project class: class Project { List<Name> names; int year; public List<Name> getNames…… -
Java – monitoring dbcp2 connection pools using JMX
I read from the dbcp2 documentation that this new version supports JMX monitoring of connection pools, but I can't fin…… -
Java – use another list to sort the list
Can the Java collections sorting method be used with a comparator because it sorts one list to sort another by the ind…… -
Java 8: why does the functional interface in Java 8 have an abstract method?
As we know in Java 8, new concepts and functional interfaces are introduced The function interface has an abstract met…… -
Java – displays JPA SQL statements when using play framework 2
I am developing a web application using play framework and JPA / hibernate For debugging purposes, I'm glad to see the…… -
Java simple telnet client using socket
I have read a lot about this topic. Telnet is a protocol, not a simple socket connection, waiting for line breaks, usi…… -
Java – text editor with syntax highlighting and line numbers?
This is a bit of a challenge for a team project, let alone a single person implementation, but I tried to use jeditorp…… -
Is there any reason to implement Java for other types util. Comparable？
Classes that implement comparable < T > usually implement it for themselves, such as class MyInteger implements …… -
How to get webelement text using selenium
See the following elements: <div class="success"><button class="close" data-dismiss="alert" type="button">……